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Decay Resistance of Particleboards Manufactured with Four Agro-Forest Residues Using Cassava Starch and Urea Formaldehyde as Adhesives 木薯淀粉和脲醛为胶粘剂的四种农林废弃物刨花板的耐腐性
Pub Date : 2020-09-07 DOI: 10.4236/jacen.2020.94019
P. Mensah, S. J. Mitchual, M. Apetorgbor, K. Frimpong-Mensah
Many factors including depletion of the forest, environmental awareness, and generation of large quantities of agro-forest residues have increased the need to partially or wholly replace wood with agro-forest residue for particleboard production. This study assessed the decay resistance of particleboards produced from four agro-forest residues using cassava starch and urea formaldehyde as adhesives. Musa paradisiaca pseudostem, Theobroma cacao stem and pod, and sawdust of Ceiba pentandra were used for the study. Properties determined were: Weight loss, decay resistance rating and decay susceptibility index. These properties were evaluated after 12 weeks of exposure to Coriolopsis polyzona in accordance with ASTM D 2017-05. The results indicate that the weight loss for Musa paradisiaca pseudostem particleboard was least for both urea formaldehyde and cassava starch adhesives. Even though almost all the particleboards produced were classified as resistant or highly resistant to fungi attack, those produced with urea formaldehyde had better decay resistance properties than that of cassava starch. Furthermore, particleboards coated with synthetic polyvinyl lacquer had better resistance to fungi attack than the uncoated ones. At 5% level of significance, the agro-forest residue, adhesive and surface finish as well as their interactions had significant effects on decay resistance of the particleboards produced. It is recommended that further studies which aim at determining the effect of combination of the agro-forest residues and that of urea formaldehyde and cassava starch be conducted to determine their effects on decay properties of particleboards.
许多因素,包括森林的枯竭、环境意识和大量农林残余物的产生,增加了用农林残余物部分或全部取代木材用于刨花板生产的必要性。本研究以木薯淀粉和脲醛为粘合剂,评估了四种农林废弃物生产的刨花板的耐腐性。本研究使用了拟木犀茎、可可茎和荚以及Ceiba penandra的木屑。测定的特性为:重量损失、耐衰变等级和衰变敏感性指数。根据ASTM D 2017-05,在暴露于多带Coriolopsis 12周后评估这些特性。结果表明,脲醛和木薯淀粉两种胶粘剂对木麻黄假茎刨花板的失重最小。尽管几乎所有生产的刨花板都被归类为耐真菌或高度耐真菌侵袭,但用脲醛生产的刨花板比木薯淀粉具有更好的耐腐烂性能。此外,与未涂覆的刨花板相比,涂覆合成聚乙烯漆的刨花板具有更好的抗真菌侵袭性。在5%的显著性水平上,农林废弃物、粘合剂和表面光洁度及其相互作用对生产的刨花板的耐腐性有显著影响。建议进行进一步的研究,以确定农林残余物与脲醛和木薯淀粉的组合对刨花板腐烂性能的影响。
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引用次数: 0
Isolation and Characterization of Beneficial Microorganisms in Organic, Semi-Organic and Conventional Fertilizer Treated Agricultural Field Soil and Comparison of Bacterial Richness 有机、半有机和常规施肥农田土壤中有益微生物的分离鉴定及细菌富集度比较
Pub Date : 2020-09-07 DOI: 10.4236/jacen.2020.94018
Md Mahfujur Rahman, L. Lisa, Sunzid Ahmed, M. Uddin, Tuhina Hasan, S. Zaman
The effect of different farming systems on microbial communities in agricultural environment was investigated in the present study. Depending on the present farming trend, the microbial distribution in agricultural soils treated with organic, semi-organic and conventional fertilizers was analyzed. A total of 20 soil samples were collected from different types of agricultural fields of Bangladesh Agricultural Research Institute (BARI, Gazipur). Microorganisms playing beneficial roles in soil such as nitrogen fixation (e.g. Rhizobium sp., Azotobacter sp.), phosphate solubilization (e.g. Bacillus sp., Pseudomonas sp., Phosphobacteria) and auxin production (e.g. Pseudomonas sp., Serratia sp. and Bacillus sp.) were evaluated from each of the samples. The results revealed that agricultural fields treated with chemical fertilizers showed lower microbial count than that of organic fertilizer treated agricultural fields’ soil samples. In addition, organic fertilizers amended field soils have higher phytohormone (Auxin) activities, phosphate solubilization bacteria and other bacterial richness compared to chemical fertilizer applied field soil.
研究了不同耕作制度对农业环境中微生物群落的影响。根据目前的耕作趋势,分析了有机、半有机和常规肥料处理的农业土壤中微生物的分布。共从孟加拉国农业研究所(BARI,Gazipur)不同类型的农田中采集了20个土壤样本。从每个样品中评估在土壤中发挥有益作用的微生物,如固氮作用(如根瘤菌属、固氮菌属)、磷酸盐溶解作用(如芽孢杆菌属、假单胞菌属、磷细菌)和生长素产生作用(如假单胞菌、沙雷氏菌和芽孢杆菌属)。结果表明,施用化肥的农田土壤样品的微生物计数低于施用有机肥的农田土壤样本。此外,与施用化肥的田间土壤相比,施用有机肥的田间土壤具有更高的植物激素(生长素)活性、解磷细菌和其他细菌丰富度。
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引用次数: 0
Levels of Selected Essential and Non-Essential Metals in the Soil and Ginger (Zingiber officinale) Cultivated in Wolaita Zone, Ethiopia 埃塞俄比亚沃莱塔地区土壤和种植的生姜中所选必需和非必需金属的水平
Pub Date : 2020-09-07 DOI: 10.4236/jacen.2020.94021
F. Kaba, Mesfin Bibiso Doda, Camerun Kastro Kanido
Ginger (Zingiber officinale) is an important spice and medicinal plant used in different parts of the world. The objective of current study was to determine the level of essential and non-essential metals in ginger and its correlation with concentration of metals in the supporting soil. The level of K, Na, Ca, Mg, Mn, Fe, Zn, Cu, Co, Cd and Pb in soil and ginger cultivated in the selected districts of Wolaita zone, Southern Ethiopia were determined using flame atomic absorption spectrometry. A 0.5 g ginger sample was digested using a mixture of 4 ml HNO3 and 1.5 ml HClO4 at 210°C for 150 minutes, and a 0.5 g soil sample was digested employing a mixture of 6 ml aqua-regia and 1 ml H2O2 at 280°C for 150 minutes. The metal concentrations range in dry weight basis for ginger samples is decreasing in the order: K (1691 - 3487 mg/kg) > Mg (701 - 1583 mg/kg) > Ca (862 - 1476 mg/kg) > Na (398 - 776 mg/kg) > Mn (325 - 672 mg/kg) > Fe (6.14 - 11.92 mg/kg) > Zn (5.30 - 10.09 mg/kg) > (0.12 - 0.23 mg/kg) for Pb. The concentration of Cd, Cu and Co in ginger samples were below the limit of detection. The results revealed that ginger has the ability to accumulate relatively higher amounts of K and Mg among the determined essential metals. The soil samples have been found to be acidic pH, sandy clay loam in texture, a very low electrical conductivity and moderate level of (CEC, organic carbon, available phosphorus and total nitrogen). Although, a positive correlation between the levels of K, Mg, Zn, Mn in ginger and soil samples were observed. All the non-essential metals analyzed in this study were below the permissible ranges set by FAO/WHO.
姜(Zingiber officinale)是一种重要的香料和药用植物,在世界各地广泛使用。本研究的目的是确定生姜中必需和非必需金属的含量及其与支撑土壤中金属浓度的相关性。采用火焰原子吸收光谱法测定了埃塞俄比亚南部沃莱塔地区选定地区土壤和种植的生姜中的K、Na、Ca、Mg、Mn、Fe、Zn、Cu、Co、Cd和Pb含量。使用4 ml HNO3和1.5 ml HClO4的混合物在210℃下消化0.5 g生姜样品150分钟,使用6 ml王水和1 ml H2O2的混合物在280℃下消化0.5g土壤样品150分钟。生姜样品的干重金属浓度范围呈下降趋势,其顺序为:K(1691-3487 mg/kg)>mg(701-1583 mg/kg)>Ca(862-1476 mg/kg)>Na(398-776 mg/kg)>Mn(325-672 mg/kg)>Fe(6.14-11.92 mg/kg)>Zn(5.30-10.09 mg/kg)>Pb(0.12-0.23 mg/kg)。生姜样品中Cd、Cu和Co的含量均低于检测限。结果表明,在所测定的必需金属中,生姜具有相对较高量的K和Mg积累能力。土壤样品的pH值为酸性,质地为砂质粘壤土,电导率极低,(CEC、有机碳、有效磷和总氮)含量适中。尽管如此,生姜中的K、Mg、Zn、Mn水平与土壤样品呈正相关。本研究中分析的所有非必需金属均低于粮农组织/世界卫生组织设定的允许范围。
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引用次数: 0
Oxytetracycline Water Contamination Treated with Biocarbon TiO2 and Solar Photodecomposition 生物碳TiO2与太阳光分解处理土环素类水污染
Pub Date : 2020-09-07 DOI: 10.4236/jacen.2020.94022
N. Ortiz, I. Azevedo, M. G. Vieira, F. Maichin, L. Nascimento
Reliable data of antibiotic use and environmental discharge as veterinary medicine are essential to help countries raise awareness of the appropriate use, control, and correct water release. The first approach is to change the regulatory framework based on consuming information, use policy, and discharge laws. The important research contribution is a novel water treatment process to treat, remove, and reduce antibiotic concentration in discharged water, mainly those used in the animal protein industry. The low particle biochar added during the titanium isopropoxide hydrolysis reduces the titanium dioxide (TiO2) agglomerates and promotes the adsorption surface process. Such improved catalyst material enhances the solar decomposition efficiency to 93% from original oxytetracycline with better correspondence with the Elovich kinetics, intraparticle diffusion, R-P isotherm, and Langmuir-Hinshelwood model.
抗生素使用和作为兽药的环境排放的可靠数据对于帮助各国提高对适当使用、控制和正确放水的认识至关重要。第一种方法是改变基于消费信息、使用政策和排放法律的监管框架。重要的研究贡献是一种新的水处理工艺,用于处理、去除和降低排放水中的抗生素浓度,主要用于动物蛋白工业。在异丙醇钛水解过程中加入低颗粒生物炭,减少了二氧化钛(TiO2)结块,促进了表面吸附过程。这种改进的催化剂材料将原始土霉素的太阳分解效率提高到93%,与Elovich动力学、颗粒内扩散、R-P等温线和Langmuir-Hinshelwood模型的一致性更好。
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引用次数: 0
Bioactive Compounds and Antifungal Activities of Extracts of Lamiaceae Species 夹竹桃科植物提取物的生物活性化合物及其抗真菌活性
Pub Date : 2020-08-06 DOI: 10.4236/jacen.2020.93008
D. Blank, Gabriela Hörnke Alves, P. S. Nascente, R. Freitag, M. Cleff
Origanum vulgare L. (oregano) and Rosmarinus officinalis L. (rosemary) are vegetal species belonging to the family Lamiaceae, popularly known as oregano and rosemary. Aromatic plants are used in the treatment and prevention of diseases and in the culinary as functional food in the preparation and conservation of foods. In the chemical composition of oregano and rosemary are present bioactive compounds with antimicrobial, antioxidant and flavoring effect. Several reports in the literature have presented the chemical composition and biological activity of the essential oils of oregano and rosemary. However, few studies have been carried out regarding the chemical composition and biological potential of the aqueous and ethanolic extracts of Origanum vulgare L. and Rosmarinus officinalis L. Evidencing a need to investigate the chemical composition and antifungal activity of these extracts. The objective of the study was to evaluate the bioactive compounds and antifungal activity of the aqueous and ethanolic extract of Origanum vulgare L. and Rosmarinus officinalis L. The aqueous and ethanolic extracts of Origanum vulgare L. and Rosmarinus officinalis L. present in the chemical composition phenolic acids and flavonoids. The antifungal test of the aqueous and ethanolic extract of Origanum vulgare L. and Rosmarinus officinalis L. presented antifungal potential against Candida globosa, Cryptococcus laurentii, Trichosporum assai, Rhodotorula sp., Candida albicans, Kodamaea ohmeri, Saccharomyces and Geotrichum. According to the results obtained in this study, it was concluded that the ethanolic extract of oregano and rosemary present antifungal activity against several yeasts tested, thus proving that these plant species must be carefully evaluated, aiming at a potential for use as an antimicrobial agent.
牛至(牛至)和迷迭香(迷迭香)是Lamiaceae科的植物物种,俗称牛至和迷迭香。芳香植物用于治疗和预防疾病,并在烹饪中作为功能性食品用于食品的制备和保存。牛至和迷迭香的化学成分中存在具有抗菌、抗氧化和调味作用的生物活性化合物。文献中的一些报道介绍了牛至和迷迭香精油的化学成分和生物活性。然而,很少有人对牛至和迷迭香的水提取物和乙醇提取物的化学成分和生物潜力进行研究。这表明有必要研究这些提取物的化学组成和抗真菌活性。本研究的目的是评价牛至和迷迭香的水提取物和乙醇提取物的生物活性化合物和抗真菌活性。牛至和Rosmarinus officinalis的水提取物或乙醇提取物的化学成分为酚酸和类黄酮。牛至(Origanum vulgare L.)和迷迭香(Rosmarinus officinalis L。根据这项研究的结果,得出的结论是,牛至和迷迭香的乙醇提取物对几种测试的酵母具有抗真菌活性,因此证明必须仔细评估这些植物物种,以确定其用作抗菌剂的潜力。
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引用次数: 4
Napier Grass Rumen Degradability in Sacco in Goats (Capra hircus aegagrus) Supplemented with Different Sources and Amount of Dietary Fats 饲粮中添加不同来源和数量脂肪对山羊(Capra hircus aegagrus)瘤胃纳皮尔草降解率的影响
Pub Date : 2020-08-06 DOI: 10.4236/jacen.2020.93015
Niel L. Ningal
The study aimed to explore the potential of dietary fats supplementation on the overall goat performance. Three (3) mature rumen-cannulated goats weighting 27.33 ± 1.53 kg housed in individual elevated metabolism stalls with customized fecal and urine collection tools with treatments replicated three times over time following the Complete Randomized Design (CRD). Animals were randomly selected on different dietary treatment at different cycle. For each cycle, animals were provided with 30% concentrate on the morning based on feed requirements {3% of their body weight (BW) dry matter (DM) basis} of the animals. Ad libitum feeding of Napier grass will follow thereafter. Clean drinking water were made available all the times in the respective animal watering troughs. The rumen-cannulated goats were supplemented with different levels of two dietary fats (VCO and Lard) with dietary treatment combinations as follows, Control and VCO and Lard at 3% & 5%. Degradability of dry matter (DM), crude protein (CP), neutral detergent fiber (NDF) and acid detergent fiber (ADF) were collected sequentially in every cycle of the study. There were seven (7) days lag period in every cycle for the animals to return to each natural state. On the 8th day of every cycle, animals were given different dietary treatment. Sequential insertion of nylon bag was done on the 15th to 16th day (7 days after treatment). The results showed that degradability of the dry matter (DM) was noticed degraded exponentially on the first twelve hours of incubation and slower down in the next few hours until 48 hours. Crude protein, acid and neutral detergent fiber showed breakdown of components was observed in the first 48 hours of incubation. No significant difference (P > 0.05) among treatment means was observed in all parameters gathered. This implies that mature female goat diet cannot be influenced by dietary fats from two different sources (VCO and Lard) at 3% to 5% supplementation. Based on the study conducted, dietary fats supplementation on goats such as VCO and lard given at the maximum level of 5% level did not influence the nutrient degradability of Napier grass in the rumen until it reaches at 48 hours of incubation. Supplementing ruminant diets with dietary fat in goats could increase the energy density of the animal’s diet without adverse effect on rumen degradability. This simple, easy, and basic technique could also be applied to other animal species in pursuit of finding ways to formulate indigenous feedstuff materials that have potential nutritive values. Given the limitations such as the climatic and environmental constraints, this particular study would somehow serve as benchmark in conducting related researches in optimizing the conditions with respect to animal nutrition and feedstuff utilization. Thus, this study was done to augment productivity and to provide new opportunities for achieving enhanced growth performance in a way that
本研究旨在探讨饲粮中添加脂肪对山羊整体生产性能的影响。3只成熟瘤胃插管山羊,体重27.33±1.53 kg,饲养在单独的高代谢栏内,使用定制的粪便和尿液收集工具,按照完全随机设计(CRD),重复三次处理。在不同周期随机选取不同饲粮处理的动物。每个周期,根据动物的采食量{以体重(BW)的3%干物质(DM)为基础},在早晨饲喂30%精料。随后将随意饲喂纳匹尔草。在各自的动物饮水槽中随时提供干净的饮用水。在瘤胃空心山羊饲粮中添加不同水平的VCO和猪油两种脂肪,饲粮处理组合为:对照组和VCO和猪油分别为3%和5%。在每个循环中依次收集干物质(DM)、粗蛋白质(CP)、中性洗涤纤维(NDF)和酸性洗涤纤维(ADF)的降解率。每个周期有7天的滞后期,使动物恢复到自然状态。在每个周期的第8天进行不同的饲粮处理。第15 ~ 16天(治疗后7天)依次插入尼龙袋。结果表明,干物质(DM)的可降解性在培养的前12小时呈指数级下降,在接下来的几个小时减慢,直到48小时。粗蛋白质、酸性和中性洗涤纤维在培养前48小时出现组分分解。各处理方式间各项指标均无显著差异(P < 0.05)。这表明,两种不同来源的饲粮脂肪(VCO和猪油)在3%至5%的添加量下不会影响成熟母山羊的饲粮。本研究表明,山羊饲粮中添加VCO和最大添加量为5%的猪油等脂肪,在孵育48 h之前,对瘤胃内纳皮草营养物质的可降解性没有影响。在山羊饲粮中添加脂肪可提高反刍动物饲粮的能量密度,但不会对瘤胃降解率产生不利影响。这种简单、容易和基本的技术也可以应用于其他动物物种,以寻找方法来制定具有潜在营养价值的本土饲料材料。考虑到气候和环境等因素的限制,本研究对优化动物营养和饲料利用条件的相关研究具有一定的参考价值。因此,进行这项研究是为了提高生产力,并为通过减轻贫困、改善粮食安全和营养以及促进自然资源的可持续利用的方式实现提高生长性能提供新的机会。
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引用次数: 1
Characterization of Orchard Fields Based on Soil Fertility Index (SOFIX) 基于土壤肥力指数(SOFIX)的果园田特征分析
Pub Date : 2020-08-06 DOI: 10.4236/jacen.2020.93014
Pitchayapa Pholkaw, Quoc Thinh Tran, Takamitsu Kai, Taiki Kawagoe, K. Kubota, Kiwako S. Araki, M. Kubo
Soil samples from 139 agricultural orchard fields (apple, grape, tea, and others) were analyzed using the soil fertility index. From these samples, an orchard field database was constructed and the soil properties between orchard, upland, and paddy fields were compared. The average value of bacterial biomass in the orchard fields was 7.4 × 108 cells/g-soil, ranging from not detected (lower than 6.6 × 106 cells/g-soil) to 7.7 × 109 cells/g-soil. The average values of total carbon (TC), total nitrogen (TN), total phosphorus (TP), and total potassium (TK), were 24,000 mg/kg (2670 to 128,100 mg/kg), 1460 mg/kg (133 to 6400 mg/kg), 1030 mg/kg (142 to 5362 mg/kg), and 5370 mg/kg (1214 to 18,155 mg/kg), respectively. The C/N and C/P ratios were 19 (3 to 85) and 27 (2 to 101), respectively. Soil properties of the orchard fields were compared with those of the upland and the paddy fields. The average value of bacterial biomass in the orchard fields was almost the same as that in the upland fields (8.0 × 108 cells/g-soil), but the number was lower than that in the paddy fields (12.9 × 108 cells/g-soil). The average values of TC and TN in the orchard fields fell between those in the upland fields (TC: 33,120 mg/kg, TN: 2010 mg/kg) and the paddy fields (TC: 15,420 mg/kg, TN: 1080 mg/kg). The relationship between the bacterial biomass and TC in the orchard fields resembled that in the upland fields. A suitable soil condition for the orchard fields was determined as TC: ≥25,000 mg/kg, TN: ≥1500 mg/kg, TP: ≥900 mg/kg and TK: 2500 - 10,000 mg/kg. These recommended values will be effective for the improvement of the soil quality in the orchard fields by enhancing the number and activities of microorganisms.
利用土壤肥力指数对139个果园(苹果、葡萄、茶叶等)的土壤样品进行了分析。从这些样本中,建立了果园-田地数据库,并比较了果园、旱地和稻田的土壤特性。果园土壤中细菌生物量的平均值为7.4×108个细胞/g土壤,从未检测到(低于6.6×106个细胞/g土)到7.7×109个细胞/g土都有。总碳(TC)、总氮(TN)、总磷(TP)和总钾(TK)的平均值分别为24000 mg/kg(2670至128100 mg/kg)、1460 mg/kg(133至6400 mg/kg)、1030 mg/kg(142至5362 mg/kg)和5370 mg/kg(1214至18155 mg/kg)。C/N和C/P比率分别为19(3比85)和27(2比101)。将果园的土壤性质与旱地和稻田的土壤性质进行了比较。果园的细菌生物量平均值与旱地几乎相同(8.0×108个细胞/g土壤),但数量低于稻田(12.9×108个单元/g土壤)。果园田TC和TN的平均值介于旱地(TC:33120mg/kg,TN:2010 mg/kg)和稻田(TC:15420mg/kg,TN:1080 mg/kg)之间。果园中细菌生物量与TC的关系与旱地相似。确定了适宜的果园土壤条件为:TC≥25000 mg/kg,TN≥1500 mg/kg,TP≥900 mg/kg,TK 2500~10000 mg/kg。这些推荐值将通过提高微生物的数量和活性,有效改善果园的土壤质量。
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引用次数: 2
Effect of Organic and Chemical Fertilizer Application on Growth, Yield, and Quality of Small-Sized Tomatoes 有机肥和化肥施用对小番茄生长、产量和品质的影响
Pub Date : 2020-08-06 DOI: 10.4236/jacen.2020.93011
Takamitsu Kai, Shunya Nishimori, M. Tamaki
Tomatoes in Japan are generally cultivated under management systems that use chemical fertilizers and synthetic chemical pesticides. However, the continuous use of these fertilizers and pesticides damages the soil environment and reduces the number of soil microorganisms. Organic farming has a relatively low environmental impact compared to conventional farming techniques, but typically has lower and more unstable yields. In this study, we investigated the effect of organic and chemical fertilizer application on growth, yield, and quality of small-sized (cherry) tomatoes. Cherry tomatoes were cultivated using organic and chemical organic fertilizers. Average weight and lateral diameter were significantly higher under organic fertilizer than under chemical fertilizer. In addition, shoot dry weight was significantly higher under organic fertilizer than chemical fertilizer. Lycopene content was significantly higher under organic fertilizer than chemical fertilizer. The total carbon (TC), total phosphorus (TP), total potassium (TK), available phosphoric (SP) and exchangeable potassium (SK) contents, C/N ratio, and pH were significantly higher under organic fertilizer than chemical fertilizer. Bacterial biomass, nitrite (NO? 2-N) oxidation activity, nitrification (N) circulation activity, and phosphoric (P) circulation were higher under organic fertilizer than chemical fertilizer. From these results, the study indicates that appropriate controls such as TC, total nitrogen (TN), and C/N ratio of organic fertilizer increased microbial biomass and enhanced nutrient circulation such as N circulation activity and P circulation activity. These results can be used to improve current organic farming practices and promote soil conservation.
在日本,番茄的种植管理系统通常使用化肥和合成化学农药。然而,这些肥料和农药的持续使用破坏了土壤环境,减少了土壤微生物的数量。与传统农业技术相比,有机农业对环境的影响相对较小,但通常产量较低且更不稳定。本试验研究了有机肥和化肥施用对小番茄生长、产量和品质的影响。圣女果的栽培使用有机和化学有机肥。有机肥处理的平均重和侧径显著高于化肥处理。此外,有机肥处理的地上部干重显著高于化肥处理。有机肥处理番茄红素含量显著高于化肥处理。有机肥处理土壤的总碳(TC)、全磷(TP)、全钾(TK)、速效磷(SP)和交换性钾(SK)含量、C/N比和pH显著高于化肥。细菌生物量,亚硝酸盐(NO?有机肥的2-N氧化活性、硝化(N)循环活性和磷(P)循环活性高于化肥。综上所述,适当控制有机肥总氮(TN)、总氮(TC)和碳氮比可增加微生物量,促进氮循环活性和磷循环活性等养分循环。这些结果可用于改进目前的有机耕作方法和促进土壤保持。
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引用次数: 4
Chemical and Biological Properties of Apple Orchard Soils under Natural, Organic, Hybrid, and Conventional Farming Methods 自然、有机、杂交和常规耕作方法下苹果园土壤的化学和生物特性
Pub Date : 2020-08-06 DOI: 10.4236/jacen.2020.93012
Takamitsu Kai, M. Kubo
Apples in Japan are generally cultivated under management systems that use chemical fertilizers and synthetic chemical pesticides. However, the continuous use of these fertilizers and pesticides damages the soil environment and reduces the number of soil microorganisms. In this study, we compared the chemical and biological properties of 12 soils from apple orchards in Aomori and Nagano Prefectures under four types of management systems, namely, natural conditions, with no cultivation, fertilizers, or pesticides; organic farming methods, using organic materials and pesticides approved by the Japanese Agricultural Standard organic certification system; hybrid farming methods, using a mix of organic and chemical fertilizers; and conventional farming, using chemical fertilizers and pesticides. Soil total carbon (TC), total nitrogen (TN), total phosphorus (TP), nitrate-nitrogen (NO? 3), and available phosphoric acid (SP) contents were generally found to be the highest where organic farming methods were used. Similarly, bacterial biomass, nitrification (N) circulation activity, ammonia (NH+ 4) oxidation activity, nitrite (NO? 2) oxidation activity, and phosphoric (P) circulation activity were the highest under organic farming, especially in comparison with conventional farming. This study indicated that the differences in apple sugar content, acidity, and sugar/acidity ratio between different orchard management systems were due to different soil conditions, and soil conditions under organic farming management system in apple cultivation increased bacterial biomass while enhancing N and P circulation activity and high TC. On the other hand, the soil of conventional farming has the lowest total number of bacterial biomass and lowest material cycle such as N and P circulation activity. Analysis of the chemical and biological properties of these orchard soils indicated that soil conditions under organic farming management are the most suitable for increasing microbial numbers and enhancing N and P circulation activity.
在日本,苹果一般是在使用化肥和合成化学农药的管理系统下种植的。然而,这些肥料和农药的持续使用破坏了土壤环境,减少了土壤微生物的数量。在本研究中,我们比较了青森县和长野县12个苹果园土壤在4种管理制度下的化学和生物学特性,即自然条件下,不耕种,不施肥,不施用农药;采用有机耕作方法,使用经日本农业标准批准的有机材料和农药认证体系;混合耕作方法,使用有机和化学肥料的混合;以及使用化肥和杀虫剂的传统农业。土壤全碳(TC)、全氮(TN)、全磷(TP)、硝态氮(NO?3),有效磷酸(SP)含量普遍在采用有机耕作方式的地区最高。同样,细菌生物量、硝化(N)循环活性、氨(NH+ 4)氧化活性、亚硝酸盐(NO?2)有机耕作方式下土壤的氧化活性和磷循环活性最高,特别是与常规耕作方式相比。研究表明,不同果园管理制度下苹果含糖量、酸度、糖酸比的差异是由不同土壤条件决定的,苹果有机耕作管理制度下土壤条件增加了细菌生物量,提高了氮、磷循环活性和高TC。另一方面,传统耕作方式土壤细菌总生物量最低,氮、磷循环活性等物质循环最低。对果园土壤的化学和生物学特性分析表明,有机耕作管理下的土壤条件最适合增加微生物数量和提高氮、磷循环活性。
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引用次数: 8
Phytoremediation of Oil-Contaminated Soils by Combining Flowering Plant Cultivation and Inoculation with Acinetobacter junii Strain M-2 开花植物栽培与杜松不动杆菌M-2菌株接种相结合修复含油土壤
Pub Date : 2020-08-06 DOI: 10.4236/jacen.2020.93010
Takamitsu Kai, Yuuki Okamoto, S. Murakami, M. Tamaki
Oil contamination of the soil by petroleum products has become an enormous environmental problem. In this study, we examined whether remediation of oil-contaminated soils by cultivating three flowering plants (Mimosa, Gazania, and Zinnia) could be enhanced by inoculation with Acinetobacter junii strain M-2 at different plant growth stages (at sowing, at early growth, and at mid-growth). The growth of Zinnia cultivated in oil-contaminated soils inoculated at sowing was significantly superior to that in the non-inoculated soil. Although total petroleum hydrocarbon concentrations in soils inoculated at sowing were nominally lower than those in non-inoculated soils, especially in the case of Zinnia planting, the effect did not reach statistical significance. However, dehydrogenase activity was significantly higher in the soils inoculated with A. junii strain M-2 than in non-inoculated soils for all three plant species tested. These results demonstrate that a combination of ornamental plant cultivation (particularly Zinnia) and inoculation with A. junii strain M-2 increases the efficiency of oil-contaminated soil phytoremediation.
石油产品对土壤的石油污染已经成为一个巨大的环境问题。在本研究中,我们研究了在不同的植物生长阶段(播种期、早期和中期)接种杜松不动杆菌菌株M-2是否可以通过培养三种开花植物(含羞草、Gazania和Zinnia)来增强对石油污染土壤的修复。在油污染土壤中种植的Zinnia在播种时接种的生长显著优于未接种土壤。尽管在播种时接种的土壤中的总石油烃浓度名义上低于未接种的土壤,特别是在种植百日菊的情况下,但这种影响没有达到统计学意义。然而,对于所有三种测试植物,接种刺柏菌株M-2的土壤中的脱氢酶活性显著高于未接种的土壤。这些结果表明,观赏植物栽培(特别是Zinnia)和刺柏菌株M-2的接种相结合提高了石油污染土壤的植物修复效率。
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引用次数: 0
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农业化学和环境(英文)
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