Kekayaan sumberdaya perikanan di Kabupaten Merauke memang sangat melimpah. Hal ini dibuktikan dengan lokasi fishing ground nelayan yang hanya menangkap dari pinggiran pantai saja, salah satunya berlokasi di Pantai Payum. Penelitian ini bertujuan untuk mengetahui komposisi hasil tangkapan yang tertangkap pada periode musim penghujan. Alat tangkap jaring insang hanyut digunakan selama penelitian ini dalam mengambil data tangkapan. Sebanyak 13 (tiga belas) spesies berhasil ditangkap, dimana Mugil dussumieri dan Megalops cyprinoides merupakan spesies yang paling dominan selama periode ini. Meskipun demikian, berdasarkan jumlahnya udang jenis penaeid yaitu Penaeus sp. dan Penaeus semisulcatus ditemukan sangat melimpah selang musim penghujan.
{"title":"Komposisi Jenis Ikan dan Udang yang Tertangkap pada Periode Musim Penghujan","authors":"L. Pane, S. L. Merly, Hengki K Kamur","doi":"10.35724/ag.v13i1.4419","DOIUrl":"https://doi.org/10.35724/ag.v13i1.4419","url":null,"abstract":"Kekayaan sumberdaya perikanan di Kabupaten Merauke memang sangat melimpah. Hal ini dibuktikan dengan lokasi fishing ground nelayan yang hanya menangkap dari pinggiran pantai saja, salah satunya berlokasi di Pantai Payum. Penelitian ini bertujuan untuk mengetahui komposisi hasil tangkapan yang tertangkap pada periode musim penghujan. Alat tangkap jaring insang hanyut digunakan selama penelitian ini dalam mengambil data tangkapan. Sebanyak 13 (tiga belas) spesies berhasil ditangkap, dimana Mugil dussumieri dan Megalops cyprinoides merupakan spesies yang paling dominan selama periode ini. Meskipun demikian, berdasarkan jumlahnya udang jenis penaeid yaitu Penaeus sp. dan Penaeus semisulcatus ditemukan sangat melimpah selang musim penghujan.","PeriodicalId":49559,"journal":{"name":"Scientia Agricola","volume":"20 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2023-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90464758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Astaman Amir, Wisnu I. Makhfudin, Reny Sianturi, I. R. G. Kaya
Penelitian ini bertujuan untuk mengetahui tingkat pengetahuan nelayan pesisir Wendu tentang ikan pari gergaji. Penelitian ini dilakukan pada bulan Juni 2021-Maret 2022. Sampel dalam penelitian ini sebanyak 92 orang, menggunakan metode non-probability sampling. Jenis non-probability sampling yang digunakan dalam penelitian ini adalah purposive sampling. Teknik analisis data dilakukan dengan mengkombinasikan analisis data kuantitatif dan kualitatif. Rata-rata pengetahuan terhadap habitat mencapai 68%, makanan mencapai 75%, keunikan mencapai 97%, kegunaan rostrum mencapai 70%, penanganan jika tidak sengaja tertangkap mencapai 73%, status pemanfaatan mencapai 62%, alasan perlindungan mencapai 75%, peraturan perlindungan mencapai 94%, secara keseluruhan rata–rata tingkat pengetahuan responden mencapai 77%.
{"title":"Tingkat Pengetahuan Nelayan Pesisir Wendu Tentang Ikan Pari Gergaji (Pristis spp.)","authors":"Astaman Amir, Wisnu I. Makhfudin, Reny Sianturi, I. R. G. Kaya","doi":"10.35724/ag.v12i2.5035","DOIUrl":"https://doi.org/10.35724/ag.v12i2.5035","url":null,"abstract":"Penelitian ini bertujuan untuk mengetahui tingkat pengetahuan nelayan pesisir Wendu tentang ikan pari gergaji. Penelitian ini dilakukan pada bulan Juni 2021-Maret 2022. Sampel dalam penelitian ini sebanyak 92 orang, menggunakan metode non-probability sampling. Jenis non-probability sampling yang digunakan dalam penelitian ini adalah purposive sampling. Teknik analisis data dilakukan dengan mengkombinasikan analisis data kuantitatif dan kualitatif. Rata-rata pengetahuan terhadap habitat mencapai 68%, makanan mencapai 75%, keunikan mencapai 97%, kegunaan rostrum mencapai 70%, penanganan jika tidak sengaja tertangkap mencapai 73%, status pemanfaatan mencapai 62%, alasan perlindungan mencapai 75%, peraturan perlindungan mencapai 94%, secara keseluruhan rata–rata tingkat pengetahuan responden mencapai 77%.","PeriodicalId":49559,"journal":{"name":"Scientia Agricola","volume":"6 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2023-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90965887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Nadia Octavia Susanto, Hadi Suhardjono, Sutini Sutini
Penyebaran wabah virus dewasa ini marak terjadi sehingga mengakibatkan masyarakat kekurangan sistem imun kekebalan tubuh. Penting bagi masyarakat untuk mengonsumsi makanan menyehatkan berupa sayuran yang dapat ditanam di pekarangan rumah, mengingat terbatasnya lahan pertanian. Microgreen adalah sayuran yang kaya akan kandungan vitamin, dan dapat dibudidayakan di pekarangan rumah. Faktor yang perlu dipertimbangkan, salah satunya adalah pemberian nutrisi dan penggunaan media tanam yang dapat mendukung hasil microgreen. Terdapat banyak jenis tanaman yang dibudayakan menjadi microgreen, salah satunya adalah bunga matahari. Pemberian nutrisi seperti air cucian beras dan penggunaan media tanam seperti cocopeat, arang sekam, dan kertas tisu dinilai dapat meningkatkan hasil microgreen. Penelitian ini bertujuan untuk mengetahui pengaruh konsentrasi air cucian beras dan penggunaan media tanam terhadap hasil microgreen bunga matahari (Helianthus annuus L.). Penelitian ini dilaksanakan pada bulan September-Desember 2021 di Simo Mulyo Baru, Kota Surabaya, Jawa Timur. Metode penelitian menggunakan sistem Rancangan Acak Lengkap (RAL) yang terdiri atas 2 faktor dengan 3 kali ulangan. Faktor pertama yaitu konsentrasi air cucian beras yang terdiri atas 4 taraf perlakuan dan faktor kedua yaitu penggunaan media tanam yang terdiri dari atas 3 taraf perlakuan. Hasil penelitian menunjukkan konsentrasi 20% air cucian beras dan penggunaan media tanam cocopeat dapat meningkatkan rata-rata hasil microgreen.
{"title":"Peran Air Leri dan Media Tanam Terhadap Produksi Vitamin C dan Kalsium (Ca) Pada Microgreen Bunga Matahari (Helianthus annuus L.)","authors":"Nadia Octavia Susanto, Hadi Suhardjono, Sutini Sutini","doi":"10.35724/ag.v12i2.4840","DOIUrl":"https://doi.org/10.35724/ag.v12i2.4840","url":null,"abstract":"Penyebaran wabah virus dewasa ini marak terjadi sehingga mengakibatkan masyarakat kekurangan sistem imun kekebalan tubuh. Penting bagi masyarakat untuk mengonsumsi makanan menyehatkan berupa sayuran yang dapat ditanam di pekarangan rumah, mengingat terbatasnya lahan pertanian. Microgreen adalah sayuran yang kaya akan kandungan vitamin, dan dapat dibudidayakan di pekarangan rumah. Faktor yang perlu dipertimbangkan, salah satunya adalah pemberian nutrisi dan penggunaan media tanam yang dapat mendukung hasil microgreen. Terdapat banyak jenis tanaman yang dibudayakan menjadi microgreen, salah satunya adalah bunga matahari. Pemberian nutrisi seperti air cucian beras dan penggunaan media tanam seperti cocopeat, arang sekam, dan kertas tisu dinilai dapat meningkatkan hasil microgreen. Penelitian ini bertujuan untuk mengetahui pengaruh konsentrasi air cucian beras dan penggunaan media tanam terhadap hasil microgreen bunga matahari (Helianthus annuus L.). Penelitian ini dilaksanakan pada bulan September-Desember 2021 di Simo Mulyo Baru, Kota Surabaya, Jawa Timur. Metode penelitian menggunakan sistem Rancangan Acak Lengkap (RAL) yang terdiri atas 2 faktor dengan 3 kali ulangan. Faktor pertama yaitu konsentrasi air cucian beras yang terdiri atas 4 taraf perlakuan dan faktor kedua yaitu penggunaan media tanam yang terdiri dari atas 3 taraf perlakuan. Hasil penelitian menunjukkan konsentrasi 20% air cucian beras dan penggunaan media tanam cocopeat dapat meningkatkan rata-rata hasil microgreen.","PeriodicalId":49559,"journal":{"name":"Scientia Agricola","volume":"1 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2023-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83035318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-15DOI: 10.1590/1678-992x-2022-0147
Tatiele Fruett, A. V. Inda, V. Barrón, E. L. S. Sá, Keyrauan Taha, Antonia Finkler Dias Fernandes
: Termites can create structures that alter the physical and chemical properties of soils. In this process, termites are selective about the soil constituents they will use to construct their mounds. Considering the common occurrence of termite mounds in Brazilian soils, this study aimed to investigate the selective action of termites in the mound building process. Samples were collected from six termite mounds and control soils (at a distance of 15 to 30 m from the termite mound) in different regions in Brazil to analyze the fine earth fraction. The content of clay fraction, organic C and Fe in pedogenic iron oxides increased in the mounds resulting in specific surface area increments. X-ray diffraction indicated a selectivity of termites by clay-sized particles such as kaolinite, gibbsite and iron oxides (hematite and goethite) rather than larger particles such as quartz. The proportion of low-crystalline iron oxides and the maghemite amount decreased in the mounds. The change of color parameters in the termite mounds was due to a combination of increase in clay fraction, organic carbon and iron oxides. The techniques used were sensitive, indicating changes and similarities between the control soils and the termite mounds.
{"title":"Selectivity of soil constituents by termites in the construction of Brazilian termite mounds","authors":"Tatiele Fruett, A. V. Inda, V. Barrón, E. L. S. Sá, Keyrauan Taha, Antonia Finkler Dias Fernandes","doi":"10.1590/1678-992x-2022-0147","DOIUrl":"https://doi.org/10.1590/1678-992x-2022-0147","url":null,"abstract":": Termites can create structures that alter the physical and chemical properties of soils. In this process, termites are selective about the soil constituents they will use to construct their mounds. Considering the common occurrence of termite mounds in Brazilian soils, this study aimed to investigate the selective action of termites in the mound building process. Samples were collected from six termite mounds and control soils (at a distance of 15 to 30 m from the termite mound) in different regions in Brazil to analyze the fine earth fraction. The content of clay fraction, organic C and Fe in pedogenic iron oxides increased in the mounds resulting in specific surface area increments. X-ray diffraction indicated a selectivity of termites by clay-sized particles such as kaolinite, gibbsite and iron oxides (hematite and goethite) rather than larger particles such as quartz. The proportion of low-crystalline iron oxides and the maghemite amount decreased in the mounds. The change of color parameters in the termite mounds was due to a combination of increase in clay fraction, organic carbon and iron oxides. The techniques used were sensitive, indicating changes and similarities between the control soils and the termite mounds.","PeriodicalId":49559,"journal":{"name":"Scientia Agricola","volume":"1 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67590572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-15DOI: 10.1590/1678-992x-2022-0139
K. Teka
: The Ethiopian Drylands are rich in their variety of local earthworm species. However, the category of species, and the effect of their performance on additions to plant nutrients have not been adequately evaluated. Thus, local earthworm samples were collected from the three major agroecological zones (highland, midland, and lowland) in Tigray (northern Ethiopia) and classified down to species level. Moreover, a vermicomposting experiment with four treatments (three local earthworm species, Eisenia fetida , and a conventional composting method) and three replications was established. Finally, each bin’s mature compost sample was taken to analyze plant nutrient content. The study results indicated that earthworm species in the highland, midland and lowland agroecological zones were Dendrobaena veneta , Eisenia andrie and Lumbricus rubellus , respectively. The use of these earthworms in the composting process (average of the four earthworm species) yielded higher nutrient content, ranging from 21.9 % for Sodium to 3300 % for Boron, compared to the conventional one. The highest total nitrogen (an increase of 44.4 %) and organic carbon (an increase of 33.4 %) were recorded in the Eisenia fetida and Dendrobaena veneta treated bins, respectively. Composting with Eisenia andrie has resulted in increases in P (96.1 %), K (125 %), Mg (83 %) and all micro-nutrients (between 91 % for Zn and 4400 % for B). Both Eisenia andrie and Lumbricus rubellus species contributed to the increased additions of Sulfur (85.7 %) compared to the control. It can be concluded that the use of local earthworms (particularly Eisenia andrie) in the composting process plays a significant role in plant nutrient addition.
{"title":"The role of local earthworms in plant nutrient addition in the Ethiopian Drylands","authors":"K. Teka","doi":"10.1590/1678-992x-2022-0139","DOIUrl":"https://doi.org/10.1590/1678-992x-2022-0139","url":null,"abstract":": The Ethiopian Drylands are rich in their variety of local earthworm species. However, the category of species, and the effect of their performance on additions to plant nutrients have not been adequately evaluated. Thus, local earthworm samples were collected from the three major agroecological zones (highland, midland, and lowland) in Tigray (northern Ethiopia) and classified down to species level. Moreover, a vermicomposting experiment with four treatments (three local earthworm species, Eisenia fetida , and a conventional composting method) and three replications was established. Finally, each bin’s mature compost sample was taken to analyze plant nutrient content. The study results indicated that earthworm species in the highland, midland and lowland agroecological zones were Dendrobaena veneta , Eisenia andrie and Lumbricus rubellus , respectively. The use of these earthworms in the composting process (average of the four earthworm species) yielded higher nutrient content, ranging from 21.9 % for Sodium to 3300 % for Boron, compared to the conventional one. The highest total nitrogen (an increase of 44.4 %) and organic carbon (an increase of 33.4 %) were recorded in the Eisenia fetida and Dendrobaena veneta treated bins, respectively. Composting with Eisenia andrie has resulted in increases in P (96.1 %), K (125 %), Mg (83 %) and all micro-nutrients (between 91 % for Zn and 4400 % for B). Both Eisenia andrie and Lumbricus rubellus species contributed to the increased additions of Sulfur (85.7 %) compared to the control. It can be concluded that the use of local earthworms (particularly Eisenia andrie) in the composting process plays a significant role in plant nutrient addition.","PeriodicalId":49559,"journal":{"name":"Scientia Agricola","volume":"1 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67590294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-15DOI: 10.1590/1678-992x-2022-0093
Ricardo Pereira Pinto, F. Mata, P. Pires, M. Barros, J. Araújo, M. Vaz-Velho
: This study aimed to determine the efficacy of a finishing diet added with sugar beet pulp to reduce backfat skatole of entire male pigs, using the optimised high-performance liquid chromatographic (HPLC) method. The study comprised 72 males Pietrain (Large White × Landrace), divided into two groups of 36 animals each. Pigs in group A (treatment) were fed a supplemented formula (addition of 10 % beet pulp). while animals in group B (control) received a commercial feed, both for a period of 14 days before slaughter. The isocratic HPLC method achieved the chromatographic separation of indolic compounds in approximately 3 min. Skatole was significantly lower ( p = 0.002) in group A, showing that beet root supplementation reduced skatole levels in pig fat. In addition, the optimised HPLC method was reliable, less time-consuming, and showed a resolution suitable for small amounts of skatole.
{"title":"The use of sugar beet pulp in pig diet to control skatole analysed by HPLC quantification method","authors":"Ricardo Pereira Pinto, F. Mata, P. Pires, M. Barros, J. Araújo, M. Vaz-Velho","doi":"10.1590/1678-992x-2022-0093","DOIUrl":"https://doi.org/10.1590/1678-992x-2022-0093","url":null,"abstract":": This study aimed to determine the efficacy of a finishing diet added with sugar beet pulp to reduce backfat skatole of entire male pigs, using the optimised high-performance liquid chromatographic (HPLC) method. The study comprised 72 males Pietrain (Large White × Landrace), divided into two groups of 36 animals each. Pigs in group A (treatment) were fed a supplemented formula (addition of 10 % beet pulp). while animals in group B (control) received a commercial feed, both for a period of 14 days before slaughter. The isocratic HPLC method achieved the chromatographic separation of indolic compounds in approximately 3 min. Skatole was significantly lower ( p = 0.002) in group A, showing that beet root supplementation reduced skatole levels in pig fat. In addition, the optimised HPLC method was reliable, less time-consuming, and showed a resolution suitable for small amounts of skatole.","PeriodicalId":49559,"journal":{"name":"Scientia Agricola","volume":"154 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67590077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-15DOI: 10.1590/1678-992x-2022-0176
Gisele Maciel, J. Wagner, R. Bartosik
: Soybean seeds ( Glycine max ) were dried under real scale conditions to different final moisture content (m.c.) (9.1, 9.7, 10.9 %, and control with 16.2 %) and processed through extruding-expelling. Results indicated that soybean seed m.c. affected the composition of the soybean expeller and, thus, the oil extraction efficiency (OEE), which increased as the seed m.c. decreased. A polynomic model was proposed for predicting OEE as a function of soybean m.c., indicating that drying soybean to 10 % resulted in an OEE of approximately 65 %. A thin layer drying experiment of soybean seeds indicated that the protein dispersibility index (PDI) was not affected as regards drying air temperatures up to approximately 69 °C, and a bi-linear model with a non-pre-established break point was fitted. The real scale drying treatment in a rack type dryer (mixed flow) did not show any effect ( p > 0.05) on the PDI at 80 °C, while at 115 °C a reduction ( p < 0.05) was observed (PDI reduction was 0.8 and 2.1 percentage points, respectively).
{"title":"Drying of soybean seeds and effect on protein quality and oil extraction efficiency by extruding-expelling process","authors":"Gisele Maciel, J. Wagner, R. Bartosik","doi":"10.1590/1678-992x-2022-0176","DOIUrl":"https://doi.org/10.1590/1678-992x-2022-0176","url":null,"abstract":": Soybean seeds ( Glycine max ) were dried under real scale conditions to different final moisture content (m.c.) (9.1, 9.7, 10.9 %, and control with 16.2 %) and processed through extruding-expelling. Results indicated that soybean seed m.c. affected the composition of the soybean expeller and, thus, the oil extraction efficiency (OEE), which increased as the seed m.c. decreased. A polynomic model was proposed for predicting OEE as a function of soybean m.c., indicating that drying soybean to 10 % resulted in an OEE of approximately 65 %. A thin layer drying experiment of soybean seeds indicated that the protein dispersibility index (PDI) was not affected as regards drying air temperatures up to approximately 69 °C, and a bi-linear model with a non-pre-established break point was fitted. The real scale drying treatment in a rack type dryer (mixed flow) did not show any effect ( p > 0.05) on the PDI at 80 °C, while at 115 °C a reduction ( p < 0.05) was observed (PDI reduction was 0.8 and 2.1 percentage points, respectively).","PeriodicalId":49559,"journal":{"name":"Scientia Agricola","volume":"1 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67590468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-15DOI: 10.1590/1678-992x-2022-0145
C. Pereira, R. Mulazzani, Q. Lier, F. A. Pedron, P. I. Gubiani
: Stony soils have been increasingly used for agriculture production; however, little is known about their hydraulic properties due to problems, such as sample deformation and hydraulic continuity between samples and suction devices when the sampling and measurements are accomplished with traditional techniques. In this study, the traditional ring sampling technique was replaced by the sampling of undisturbed soil blocks coated with paraffin wax to preserve their structure. A saturated paste of fine-grained mineral particles was used to ensure contact and hydraulic continuity between samples and suction devices (sand table and ceramic plates). This allowed us to determine 30 water retention curves for three stony soils with coarse particle contents (> 2 mm) ranging from zero to 69 %. The van Genuchten model was fitted to the measured retention data and the root mean square errors were between 0.0034 and 0.0331 m 3 m –3 , with no outliers or odd behavior in the retention curves. These results showed that consistent water retention curves for stony soils can be determined with the technique proposed. Fine-grained minerals sandwiched between the surface of suctions sources and sampled blocks improve hydraulic continuity between them. These techniques can be applied to determine water retention properties in structured soil samples with coarse particles where it is unfeasible to collect structured soil samples with metal sampling rings.
{"title":"Measuring water retention in undisturbed samples of stony soils","authors":"C. Pereira, R. Mulazzani, Q. Lier, F. A. Pedron, P. I. Gubiani","doi":"10.1590/1678-992x-2022-0145","DOIUrl":"https://doi.org/10.1590/1678-992x-2022-0145","url":null,"abstract":": Stony soils have been increasingly used for agriculture production; however, little is known about their hydraulic properties due to problems, such as sample deformation and hydraulic continuity between samples and suction devices when the sampling and measurements are accomplished with traditional techniques. In this study, the traditional ring sampling technique was replaced by the sampling of undisturbed soil blocks coated with paraffin wax to preserve their structure. A saturated paste of fine-grained mineral particles was used to ensure contact and hydraulic continuity between samples and suction devices (sand table and ceramic plates). This allowed us to determine 30 water retention curves for three stony soils with coarse particle contents (> 2 mm) ranging from zero to 69 %. The van Genuchten model was fitted to the measured retention data and the root mean square errors were between 0.0034 and 0.0331 m 3 m –3 , with no outliers or odd behavior in the retention curves. These results showed that consistent water retention curves for stony soils can be determined with the technique proposed. Fine-grained minerals sandwiched between the surface of suctions sources and sampled blocks improve hydraulic continuity between them. These techniques can be applied to determine water retention properties in structured soil samples with coarse particles where it is unfeasible to collect structured soil samples with metal sampling rings.","PeriodicalId":49559,"journal":{"name":"Scientia Agricola","volume":"1 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67590477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-15DOI: 10.1590/1678-992x-2022-0088
N. P. Reis, J. Lobato, J. Restle, R. F. Pacheco, A. Nuñez, Dayana Bernardi Sarzi Sartori, R. Z. Vaz
: Determining what and how much each environmental factor affects pregnancy is crucial to the sustainability and management of beef cow herds. The study evaluated through logistic regression the effect of environmental variables on the increase or reduction in the pregnancy rate of beef cows. The average pregnancy rate in the cows was 73 %, with an average age for the herd of 3.7 years. An increase in age of one year represented a 30 % increase in pregnancy, while a reduction of one year reduced the odds of pregnancy in the cows by 23 %. During the lactation period, an extra seven days’ lactation reduced the odds of pregnancy by 12 %. For every seven days that weaning was brought forward, the cows’ pregnancy odds increased by 14 %. An increase of 0.1 kg in average daily gain represented an increase of 17 % and 15 % in the odds of pregnancy during the first 60 days post-partum and 60 days to the end of the reproductive period. On the other hand, the loss of 0.1 kg in average daily gain resulted in a 14 % and 13 % reduction in the cows’ pregnancy odds, respectively. Factors such as age, the precocity of calving in the calving season, the time the calf remains with the cow and better performance in cows between calving and the end of the mating are strategies that increase the chances of pregnancy in beef cows.
{"title":"Effect of the performance, calving date and lactation period on the probability of pregnancy in beef cows","authors":"N. P. Reis, J. Lobato, J. Restle, R. F. Pacheco, A. Nuñez, Dayana Bernardi Sarzi Sartori, R. Z. Vaz","doi":"10.1590/1678-992x-2022-0088","DOIUrl":"https://doi.org/10.1590/1678-992x-2022-0088","url":null,"abstract":": Determining what and how much each environmental factor affects pregnancy is crucial to the sustainability and management of beef cow herds. The study evaluated through logistic regression the effect of environmental variables on the increase or reduction in the pregnancy rate of beef cows. The average pregnancy rate in the cows was 73 %, with an average age for the herd of 3.7 years. An increase in age of one year represented a 30 % increase in pregnancy, while a reduction of one year reduced the odds of pregnancy in the cows by 23 %. During the lactation period, an extra seven days’ lactation reduced the odds of pregnancy by 12 %. For every seven days that weaning was brought forward, the cows’ pregnancy odds increased by 14 %. An increase of 0.1 kg in average daily gain represented an increase of 17 % and 15 % in the odds of pregnancy during the first 60 days post-partum and 60 days to the end of the reproductive period. On the other hand, the loss of 0.1 kg in average daily gain resulted in a 14 % and 13 % reduction in the cows’ pregnancy odds, respectively. Factors such as age, the precocity of calving in the calving season, the time the calf remains with the cow and better performance in cows between calving and the end of the mating are strategies that increase the chances of pregnancy in beef cows.","PeriodicalId":49559,"journal":{"name":"Scientia Agricola","volume":"26 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67590028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-15DOI: 10.1590/1678-992x-2023-0080
J. Parra
{"title":"Biological Control in Brazil: state of art and perspectives","authors":"J. Parra","doi":"10.1590/1678-992x-2023-0080","DOIUrl":"https://doi.org/10.1590/1678-992x-2023-0080","url":null,"abstract":"","PeriodicalId":49559,"journal":{"name":"Scientia Agricola","volume":"1 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67590777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：