Pub Date : 2023-11-26DOI: 10.1080/00288233.2023.2287717
Wagner Sousa Alves, Odilon Gomes Pereira, Alberto Jefferson da Silva Macêdo, Gabriela Duarte Oliveira Leite, Vanessa Paula da Silva, Patrícia Siqueira Leite, Karina Guimarães Ribeiro, Sebastião de Campos Valadares Filho
We evaluated the effects of various wild strains of Lentilactobacillus buchneri on the fermentation and aerobic stability of sorghum silages as well as on their intake, digestibility, nitrogen bala...
{"title":"Effect of new strains of Lentilactobacillus buchneri as inoculants in sorghum silage on the fermentative profile, aerobic stability, and voluntary intake in lambs","authors":"Wagner Sousa Alves, Odilon Gomes Pereira, Alberto Jefferson da Silva Macêdo, Gabriela Duarte Oliveira Leite, Vanessa Paula da Silva, Patrícia Siqueira Leite, Karina Guimarães Ribeiro, Sebastião de Campos Valadares Filho","doi":"10.1080/00288233.2023.2287717","DOIUrl":"https://doi.org/10.1080/00288233.2023.2287717","url":null,"abstract":"We evaluated the effects of various wild strains of Lentilactobacillus buchneri on the fermentation and aerobic stability of sorghum silages as well as on their intake, digestibility, nitrogen bala...","PeriodicalId":19287,"journal":{"name":"New Zealand Journal of Agricultural Research","volume":"44 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138529580","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 : 2023-11-26DOI: 10.1080/00288233.2023.2274404
David Scobie, Chikako van Koten, Marina Richena, Jeffrey Plowman, Duane Harland
Segregation into lustrous and wild-type birth coats suggested both dominant and recessive inheritance patterns associated with birth coat and subsequently with low wool fibre curvature at lamb and ...
有光泽和野生型毛毛的分离表明，与毛毛相关的显性和隐性遗传模式以及随后的低羊毛纤维弯曲度在羔羊和…
{"title":"Recessive and dominant inheritance patterns associated with synonymous differences in wool fibre curvature and medullation","authors":"David Scobie, Chikako van Koten, Marina Richena, Jeffrey Plowman, Duane Harland","doi":"10.1080/00288233.2023.2274404","DOIUrl":"https://doi.org/10.1080/00288233.2023.2274404","url":null,"abstract":"Segregation into lustrous and wild-type birth coats suggested both dominant and recessive inheritance patterns associated with birth coat and subsequently with low wool fibre curvature at lamb and ...","PeriodicalId":19287,"journal":{"name":"New Zealand Journal of Agricultural Research","volume":"19 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138529588","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 : 2023-11-22DOI: 10.1080/00288233.2023.2283052
Jessica I. Dalton, Stacey J. Hendriks, John R. Roche, Danny J. Donaghy, Brian Dela Rue, Barbara Kuhn-Sherlock, Claire V. C. Phyn
This study determined the effect of feeding synthetic zeolite A prepartum to reduce periparturient hypocalcaemia risk on the eating, lying, and activity behaviours of multiparous grazing dairy cows...
本研究确定了饲喂合成沸石A制剂以降低围产期低钙血症风险对多产放牧奶牛进食、躺卧和活动行为的影响。
{"title":"The effect of prepartum synthetic zeolite supplementation on the eating, lying and activity behaviours of grazing dairy cows","authors":"Jessica I. Dalton, Stacey J. Hendriks, John R. Roche, Danny J. Donaghy, Brian Dela Rue, Barbara Kuhn-Sherlock, Claire V. C. Phyn","doi":"10.1080/00288233.2023.2283052","DOIUrl":"https://doi.org/10.1080/00288233.2023.2283052","url":null,"abstract":"This study determined the effect of feeding synthetic zeolite A prepartum to reduce periparturient hypocalcaemia risk on the eating, lying, and activity behaviours of multiparous grazing dairy cows...","PeriodicalId":19287,"journal":{"name":"New Zealand Journal of Agricultural Research","volume":"2 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138509748","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 : 2023-11-19DOI: 10.1080/00288233.2023.2280624
Anne L. Ridler, Paul R. Kenyon, Andy W. Greer, Chris M. Logan, Sarah Morgan, Rene A. Corner-Thomas
Removal of ewes from a flock before the end of their productive life, sometimes described as ewe wastage, can potentially lead to reduced flock productivity. While the main reasons for culling ewes...
{"title":"Ewe culling in New Zealand: an interview study of 38 farmers","authors":"Anne L. Ridler, Paul R. Kenyon, Andy W. Greer, Chris M. Logan, Sarah Morgan, Rene A. Corner-Thomas","doi":"10.1080/00288233.2023.2280624","DOIUrl":"https://doi.org/10.1080/00288233.2023.2280624","url":null,"abstract":"Removal of ewes from a flock before the end of their productive life, sometimes described as ewe wastage, can potentially lead to reduced flock productivity. While the main reasons for culling ewes...","PeriodicalId":19287,"journal":{"name":"New Zealand Journal of Agricultural Research","volume":"219 2","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138509689","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 : 2023-11-12DOI: 10.1080/00288233.2023.2278734
David Pacheco, Chris Glassey, Charissa Thomas, Stewart F. Ledgard, Lisa A. Box, Brendon G. Welten, Paul R. Shorten
ABSTRACTUrinary nitrogen (UN) excretion and milk production traits of 35 groups of 15 grazing cows each were measured over two years. Urine volume and N concentration were measured with urine sensors and daily UN excretion was calculated for four consecutive days. Milk yield, composition and cow liveweight (LW) were used to estimate daily dry matter intakes (DMI) based on back-calculated animal energy requirements and feed metabolisable energy (ME). Different N fractions in the diet were estimated using laboratory data and protein digestion equations. Mean estimates of N intake and UN excretion were 460 and 227 g N/d, respectively. Urinary-N represented 52% of the N consumed, which aligns with indoor N balance studies. Urinary N excretion was weakly correlated (r = 0.29) with dietary N intake, but moderately correlated (r = 0.63–0.67) with diet N concentration, diet N:ME ratio, and diet effective rumen degradable protein (ERDP). The ERDP balance had moderate to strong correlations with N utilisation efficiency (r = −0.89) and the UN expressed relative to N intake (r = 0.59) and N in milk (r = 0.78). These relationships illustrate the potential of urine sensors and energy-based estimations of intake to assess the influence of dietary management strategies to mitigate UN excretion from grazing animals.KEYWORDS: Urine sensorsnitrogenmilk proteinrumen degradable proteinintake AcknowledgementsData collection and analyses in this study were conducted under the Low N Livestock and Low N Systems programmes, which are funded by New Zealand dairy farmers through DairyNZ Incorporated and by the Ministry of Business, Innovation and Employment (contract #DRCX1701). Additional co-funding and in-kind support are received from CRV and Fonterra. We are thankful to the staff at each of the sites used to collect the data during the field studies, as well as staff at DairyNZ for the collation of different streams of data for the analyses presented here.Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported by DairyNZ [Grant Number CRS2651]; Ministry of Business, Innovation and Employment [Grant Number DRCX1701].
{"title":"Relationships between dietary factors and nitrogen partitioning to milk and urine in temperate grazing dairy cattle","authors":"David Pacheco, Chris Glassey, Charissa Thomas, Stewart F. Ledgard, Lisa A. Box, Brendon G. Welten, Paul R. Shorten","doi":"10.1080/00288233.2023.2278734","DOIUrl":"https://doi.org/10.1080/00288233.2023.2278734","url":null,"abstract":"ABSTRACTUrinary nitrogen (UN) excretion and milk production traits of 35 groups of 15 grazing cows each were measured over two years. Urine volume and N concentration were measured with urine sensors and daily UN excretion was calculated for four consecutive days. Milk yield, composition and cow liveweight (LW) were used to estimate daily dry matter intakes (DMI) based on back-calculated animal energy requirements and feed metabolisable energy (ME). Different N fractions in the diet were estimated using laboratory data and protein digestion equations. Mean estimates of N intake and UN excretion were 460 and 227 g N/d, respectively. Urinary-N represented 52% of the N consumed, which aligns with indoor N balance studies. Urinary N excretion was weakly correlated (r = 0.29) with dietary N intake, but moderately correlated (r = 0.63–0.67) with diet N concentration, diet N:ME ratio, and diet effective rumen degradable protein (ERDP). The ERDP balance had moderate to strong correlations with N utilisation efficiency (r = −0.89) and the UN expressed relative to N intake (r = 0.59) and N in milk (r = 0.78). These relationships illustrate the potential of urine sensors and energy-based estimations of intake to assess the influence of dietary management strategies to mitigate UN excretion from grazing animals.KEYWORDS: Urine sensorsnitrogenmilk proteinrumen degradable proteinintake AcknowledgementsData collection and analyses in this study were conducted under the Low N Livestock and Low N Systems programmes, which are funded by New Zealand dairy farmers through DairyNZ Incorporated and by the Ministry of Business, Innovation and Employment (contract #DRCX1701). Additional co-funding and in-kind support are received from CRV and Fonterra. We are thankful to the staff at each of the sites used to collect the data during the field studies, as well as staff at DairyNZ for the collation of different streams of data for the analyses presented here.Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported by DairyNZ [Grant Number CRS2651]; Ministry of Business, Innovation and Employment [Grant Number DRCX1701].","PeriodicalId":19287,"journal":{"name":"New Zealand Journal of Agricultural Research","volume":"80 22","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135037223","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 : 2023-11-12DOI: 10.1080/00288233.2023.2278733
Inthujaa Sanjayaranj, Nicolas López-Villalobos, Hugh T. Blair, Patrick W. M. Janssen, Stephen E. Holroyd, Alastair K. H. MacGibbon
Solid fat content at 10°C (SFC10) is an important parameter of milk fat that influences the spreadability of butter. This study aimed to evaluate the effect of breed and stage of lactation on SFC10 of milk fat from cows milked once a day (OAD) or twice a day (TAD). Milk was collected from 39 Holstein-Friesian (F), 27 Jersey (J), and 34 Holstein-Friesian × Jersey (F × J) cows from a OAD herd and 104 F and 83 F × J cows from a TAD herd in early, mid and late lactation. The SFC10 was predicted using a regression model using milk fatty acid composition. The lower the SFC10, the higher the spreadability of butter. The SFC10 was lower (P < 0.05) for F cows compared with J cows milked OAD. The SFC10 was lower (P < 0.05) for F cows compared with F × J cows milked TAD. The SFC10 was lower in early lactation compared with mid- and late lactation in both milking frequencies. This study revealed that F cow milk and early lactation milk would be suitable for making more easily spreadable butter in OAD and TAD milking. These results could be applicable in the New Zealand dairy industry if consumer preference for more easily spreadable butter increases.
{"title":"Effect of breed and stage of lactation on the solid fat content of milk from cows milked once a day or twice a day","authors":"Inthujaa Sanjayaranj, Nicolas López-Villalobos, Hugh T. Blair, Patrick W. M. Janssen, Stephen E. Holroyd, Alastair K. H. MacGibbon","doi":"10.1080/00288233.2023.2278733","DOIUrl":"https://doi.org/10.1080/00288233.2023.2278733","url":null,"abstract":"Solid fat content at 10°C (SFC10) is an important parameter of milk fat that influences the spreadability of butter. This study aimed to evaluate the effect of breed and stage of lactation on SFC10 of milk fat from cows milked once a day (OAD) or twice a day (TAD). Milk was collected from 39 Holstein-Friesian (F), 27 Jersey (J), and 34 Holstein-Friesian × Jersey (F × J) cows from a OAD herd and 104 F and 83 F × J cows from a TAD herd in early, mid and late lactation. The SFC10 was predicted using a regression model using milk fatty acid composition. The lower the SFC10, the higher the spreadability of butter. The SFC10 was lower (P < 0.05) for F cows compared with J cows milked OAD. The SFC10 was lower (P < 0.05) for F cows compared with F × J cows milked TAD. The SFC10 was lower in early lactation compared with mid- and late lactation in both milking frequencies. This study revealed that F cow milk and early lactation milk would be suitable for making more easily spreadable butter in OAD and TAD milking. These results could be applicable in the New Zealand dairy industry if consumer preference for more easily spreadable butter increases.","PeriodicalId":19287,"journal":{"name":"New Zealand Journal of Agricultural Research","volume":"81 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135037221","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 : 2023-11-08DOI: 10.1080/00288233.2023.2277231
Rene A. Corner-Thomas, Rachel Shanks, Ngaio J. Beausoleil
This study examined the suckling behaviour of triplet-rearing ewes for three days post-parturition. Twenty-six ewes were enrolled with 11 being observed for the entire 3-days post-lambing. The behaviour of the ewe, number of lambs present at the end of the event and the behaviour that terminated the event were recorded for each suckling event. The mean suckling event duration increased when additional lambs were present at the end of the suckling event. Ewes that had observations across all three days showed no change in the number of suckling events over time, but suckling events tended to be shorter on day 3 than on days 1 or 2. On day 1 more suckling events were terminated by the ewe walking away from her lambs than on days 2 and 3. The odds of a ewe walking away to terminate the suckling event were greater when three lambs were present compared with two. Ewes showed more inactive behaviours when more lambs were present at the end of the suckling event. The results partially supported the hypothesis that the ewe would be more likely to terminate a suckling event when three lambs were attempting to suck compared with one or two lambs.
{"title":"The influence of the number of lambs present on the suckling behaviour of triplet-rearing ewes at pasture","authors":"Rene A. Corner-Thomas, Rachel Shanks, Ngaio J. Beausoleil","doi":"10.1080/00288233.2023.2277231","DOIUrl":"https://doi.org/10.1080/00288233.2023.2277231","url":null,"abstract":"This study examined the suckling behaviour of triplet-rearing ewes for three days post-parturition. Twenty-six ewes were enrolled with 11 being observed for the entire 3-days post-lambing. The behaviour of the ewe, number of lambs present at the end of the event and the behaviour that terminated the event were recorded for each suckling event. The mean suckling event duration increased when additional lambs were present at the end of the suckling event. Ewes that had observations across all three days showed no change in the number of suckling events over time, but suckling events tended to be shorter on day 3 than on days 1 or 2. On day 1 more suckling events were terminated by the ewe walking away from her lambs than on days 2 and 3. The odds of a ewe walking away to terminate the suckling event were greater when three lambs were present compared with two. Ewes showed more inactive behaviours when more lambs were present at the end of the suckling event. The results partially supported the hypothesis that the ewe would be more likely to terminate a suckling event when three lambs were attempting to suck compared with one or two lambs.","PeriodicalId":19287,"journal":{"name":"New Zealand Journal of Agricultural Research","volume":"5 15","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135391635","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 : 2023-11-08DOI: 10.1080/00288233.2023.2259344
Juliana Rodrigues Lacerda Lima, Rosane Cláudia Rodrigues, Giovanne Oliveira Costa Sousa, Ana Paula Ribeiro de Jesus, Ana Claudia da Costa, Alessandra Schaphauser Rosseto Fonseca, Luciano da Silva Cabral, Clésio dos Santos Costa, Juliana Silva de Oliveira, Eduarda Castro da Silva
ABSTRACTThis study aimed to evaluate the effect of Parkia platycephala pods in the supplements for grazing sheep on intake, digestibility, and animal performance. Twenty-four sheep (21.26 ± 2.87 kg) were used by a completely randomised design with six animals per treatment. The evaluated treatments were mineral salt (MS), mineral salt + urea/ammonium sulfate (urea-supplement; UR), multiple supplements based on corn + soybean meal (MSCS), and multiple supplements in which P. platycephala pods replaced 50% of corn (MSPP). The supplements evaluated did not affect pasture intake, and total dry matter (DM) intake was higher for animals fed multiple or UR than those fed with MS. Sheep fed multiple supplements presented 55.57% higher crude protein (CP) intake than those fed MS or UR. Neutral detergent fibre intake was 17.76% lower in sheep fed MS than those fed other supplements. Animals fed multiple supplements presented higher digestibility for DM and CP than those fed MS or US. Animals fed multiple supplements presented 54.61% higher total body weight gain and 54.79% higher average daily gain than those fed MS or US. Thus, Parkia platycephala pods can replace 50% of corn in multiple supplements without compromising the performance of grazing sheep.KEYWORDS: Biometricsentrance heightlight interceptionParkia platycephalastocking rate Disclosure statementNo potential conflict of interest was reported by the author(s).
{"title":"Performance of grazing sheep kept on tamani grass supplemented with <i>Parkia platycephala</i> pods replacing corn in the multiple supplements","authors":"Juliana Rodrigues Lacerda Lima, Rosane Cláudia Rodrigues, Giovanne Oliveira Costa Sousa, Ana Paula Ribeiro de Jesus, Ana Claudia da Costa, Alessandra Schaphauser Rosseto Fonseca, Luciano da Silva Cabral, Clésio dos Santos Costa, Juliana Silva de Oliveira, Eduarda Castro da Silva","doi":"10.1080/00288233.2023.2259344","DOIUrl":"https://doi.org/10.1080/00288233.2023.2259344","url":null,"abstract":"ABSTRACTThis study aimed to evaluate the effect of Parkia platycephala pods in the supplements for grazing sheep on intake, digestibility, and animal performance. Twenty-four sheep (21.26 ± 2.87 kg) were used by a completely randomised design with six animals per treatment. The evaluated treatments were mineral salt (MS), mineral salt + urea/ammonium sulfate (urea-supplement; UR), multiple supplements based on corn + soybean meal (MSCS), and multiple supplements in which P. platycephala pods replaced 50% of corn (MSPP). The supplements evaluated did not affect pasture intake, and total dry matter (DM) intake was higher for animals fed multiple or UR than those fed with MS. Sheep fed multiple supplements presented 55.57% higher crude protein (CP) intake than those fed MS or UR. Neutral detergent fibre intake was 17.76% lower in sheep fed MS than those fed other supplements. Animals fed multiple supplements presented higher digestibility for DM and CP than those fed MS or US. Animals fed multiple supplements presented 54.61% higher total body weight gain and 54.79% higher average daily gain than those fed MS or US. Thus, Parkia platycephala pods can replace 50% of corn in multiple supplements without compromising the performance of grazing sheep.KEYWORDS: Biometricsentrance heightlight interceptionParkia platycephalastocking rate Disclosure statementNo potential conflict of interest was reported by the author(s).","PeriodicalId":19287,"journal":{"name":"New Zealand Journal of Agricultural Research","volume":"4 24","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135391644","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 : 2023-11-02DOI: 10.1080/00288233.2023.2277916
Jiafa Luo, Tony van der Weerden, Surinder Saggar, Hong J. Di, Andriy Podolyan, Kamal Adhikari, Keren Ding, Stuart Lindsey, Dongwen Luo, Lily Ouyang, Alison Rutherford
This study determined the nitrous oxide emission factors (EF1, the percentage of N2O emitted as a proportion of fertiliser N applied) for fertilisers ammonium sulphate (AS), diammonium phosphate (DAP), and urea under the same field conditions. Trials were conducted on pasture soils across four sites (Waikato, Manawatu, Canterbury and Otago) in New Zealand during late autumn and spring of 2022. The average EF1 values for urea across all four sites were 0.128% (95% C.I., 0.023% and 0.249%) in late autumn and 0.136% (95% C.I., 0.031% and 0.259%) in spring. The corresponding EF1 values for AS were 0.125% (95% C.I., – 0.021% and 0.246%) in late autumn and 0.083% (95% C.I., 0.015% and 0.197%) in spring, while for DAP, they were 0.049% (95% C.I., – 0.044% and 0.157%) in late autumn and 0.090% (95% C.I., -0.009% and 0.205%) in spring. The mean EF1 values across all four sites and two seasons were calculated as 0.132% (95% C.I., 0.016% and 0.269%) for urea, 0.104% (95% C.I., – 0.008% and 0.235%) for AS, and 0.069% (95% C.I., – 0.036 and 0.194) for DAP. No significant differences in EF1 were observed between the three fertilisers (P > 0.05) at individual sites or when considering all four sites collectively.
{"title":"Nitrous oxide emission factors for fertiliser ammonium sulphate, diammonium phosphate, and urea","authors":"Jiafa Luo, Tony van der Weerden, Surinder Saggar, Hong J. Di, Andriy Podolyan, Kamal Adhikari, Keren Ding, Stuart Lindsey, Dongwen Luo, Lily Ouyang, Alison Rutherford","doi":"10.1080/00288233.2023.2277916","DOIUrl":"https://doi.org/10.1080/00288233.2023.2277916","url":null,"abstract":"This study determined the nitrous oxide emission factors (EF1, the percentage of N2O emitted as a proportion of fertiliser N applied) for fertilisers ammonium sulphate (AS), diammonium phosphate (DAP), and urea under the same field conditions. Trials were conducted on pasture soils across four sites (Waikato, Manawatu, Canterbury and Otago) in New Zealand during late autumn and spring of 2022. The average EF1 values for urea across all four sites were 0.128% (95% C.I., 0.023% and 0.249%) in late autumn and 0.136% (95% C.I., 0.031% and 0.259%) in spring. The corresponding EF1 values for AS were 0.125% (95% C.I., – 0.021% and 0.246%) in late autumn and 0.083% (95% C.I., 0.015% and 0.197%) in spring, while for DAP, they were 0.049% (95% C.I., – 0.044% and 0.157%) in late autumn and 0.090% (95% C.I., -0.009% and 0.205%) in spring. The mean EF1 values across all four sites and two seasons were calculated as 0.132% (95% C.I., 0.016% and 0.269%) for urea, 0.104% (95% C.I., – 0.008% and 0.235%) for AS, and 0.069% (95% C.I., – 0.036 and 0.194) for DAP. No significant differences in EF1 were observed between the three fertilisers (P > 0.05) at individual sites or when considering all four sites collectively.","PeriodicalId":19287,"journal":{"name":"New Zealand Journal of Agricultural Research","volume":"29 12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135876156","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 : 2023-11-01DOI: 10.1080/00288233.2023.2274395
Suzanne P. Boschma, Mark A. Brennan, Steven Harden
ABSTRACTTemperate annual legumes can be effective companion species in tropical perennial grass pastures. These legumes are commonly sown in autumn following establishment of the grasses. However, it may be more effective to establish a seed bank before sowing the grass, or possibly sow the legumes as hard seed/pod in spring when the tropical grass pasture is sown. A study was conducted in northern New South Wales to compare establishment, regeneration and productivity of three hard-seeded legumes: bladder clover (Trifolium spumosum) cv. Bartolo, biserrula (Biserrula pelecinus) cv. Casbah and French serradella (Ornithopus sativus) cv. Margurita. The legumes were sown four times: either one or two autumns before digit grass (Digitaria eriantha) cv. Premier was established, the autumn following grass establishment or sown at the same time as the grass as either hard seed/pod segments or scarified seed (total of five treatments). While seasonal conditions influenced establishment success, autumn was the optimal time to sow temperate annual legumes to achieve a productive mixed pasture. The legumes can be sown 1–2 autumns before or in the autumn following grass establishment. Legume plant populations of spring sown hard seed/pod segments were lower than those autumn sown but they increased the following year.KEYWORDS: Twin sowing, summer sowing, hard seed breakdown, tropical pasture, summer dominant rainfall zone AcknowledgementsThe authors appreciate the technical support provided by Geoff Bevan, Peter Sanson and Ivan Stace. Additionally, the authors appreciate advice provided by Dr Belinda Hackney on legume species and sowing rates, Dr Angelo Loi for discussion on results, and feedback from Dr Bernie Dominiak on an earlier version of this manuscript. The authors also thank Robert and Lea Bowman ‘Bonnie Doon’, Manilla for providing the site to conduct this study.Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported by Meat and Livestock Australia under grant B. PSP.0001.
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