Simulating gibberellic acid effect on pasture yield on naturally deposited and fixed area urine

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dc.citation.issue7
dc.citation.volume10
dc.contributor.authorMatse D
dc.contributor.authorAvendano F
dc.contributor.authorBishop P
dc.contributor.authorJeyakumar P
dc.contributor.authorBates G
dc.date.accessioned2023-07-04T21:18:52Z
dc.date.available2023-07-02
dc.date.available2023-07-04T21:18:52Z
dc.date.issued2/07/2023
dc.description© 2023 by the authors
dc.description.abstractNitrate (NO3−-N) leaching from urine patches is a serious environmental concern in dairy pastoral systems. In our previous research, we established that application of a plant growth hormone, gibberellic acid (GA), can potentially reduce NO3−-N leaching in urine patches; however, this was investigated in two locations in New Zealand. The performance of GA in influencing pasture nitrogen (N) uptake and NO3−-N leaching needs to be undertaken in multi-locations to draw conclusions. However, multi-location studies are a challenge due to a lack of funding and time constraints, so models such as the agricultural production systems simulator (APSIM) have been used. Therefore, field studies were conducted to determine whether APSIM can be used to quantify and simulate the effect of GA on NO3−-N leaching and pasture yield in three experimental sites known as Ashburton, Stratford, and Rotorua in New Zealand. Treatments examined were control (no urine applied), urine at 600 kg N ha−1, urine + GA at 8 g ha−1. The observed data was used to calibrate and validate the model. APSIM simulated that application of GA reduced NO3−-N leaching (relative to urine treatment) by 4.6, 5.1, and 8.8 kg NO3−-N ha−1 in Ashburton, Stratford, and Rotorua, respectively. APSIM reliably simulated pasture dry matter yield, and this was confirmed by the coefficient of determination ranging from R2 = 0.8562 to 0.995 in all treatments and experimental sites. This study demonstrated that APSIM can effectively be used to simulate the effect of GA application on NO3−-N leaching and pasture yield. Therefore, APSIM can be applied in other areas to simulate NO3−-N leaching and pasture yield.
dc.description.confidentialFALSE
dc.identifier112
dc.identifier.citationEnvironments, 2023, 10 (7)
dc.identifier.elements-id462418
dc.identifier.harvestedMassey_Dark
dc.identifier.issn2076-3298
dc.identifier.urihttps://hdl.handle.net/10179/18384
dc.publisherMDPI
dc.relation.isPartOfEnvironments
dc.relation.urihttps://www.mdpi.com/2076-3298/10/7/112
dc.subjectAPSIM model; growth hormone; nitrate leaching; perennial ryegrass
dc.titleSimulating gibberellic acid effect on pasture yield on naturally deposited and fixed area urine
dc.typeJournal article
pubs.notesNot known
pubs.organisational-group/Massey University
pubs.organisational-group/Massey University/College of Sciences
pubs.organisational-group/Massey University/College of Sciences/School of Agriculture & Environment
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