Matse Dumsane Themba, Jeyakumar Paramsothy, Bishop Peter, Anderson Christopher W N
Environmental Sciences Group, School of Agriculture and Environment, Massey University, Private Bag 11 222, Palmerston North 4442, New Zealand.
Plants (Basel). 2022 Sep 17;11(18):2430. doi: 10.3390/plants11182430.
This lysimeter study investigated the effect of late-autumn application of dicyandiamide (DCD), co-poly acrylic-maleic acid (PA-MA), calcium lignosulphonate (LS), a split-application of calcium lignosulphonate (2LS), and a combination of gibberellic acid (GA) and LS (GA + LS) to reduce N leaching losses during May 2020 to December 2020 in lysimeter field sites in Manawatu (Orthic Pumice soil) and Canterbury (Pallic Orthic Brown soil), New Zealand. In a second application, urine-only, GA only and GA + LS treatments were applied during July 2020 in mid-winter on both sites. Results showed that late-autumn application of DCD, 2LS and GA + LS reduced mineral N leaching by 8%, 16%, and 35% in the Manawatu site and by 34%, 11%, and 35% in the Canterbury site, respectively when compared to urine-only. There was no significant increase in cumulative herbage N uptake and yield between urine-treated lysimeters in both sites. Mid-winter application of GA and GA + LS reduced mineral N leaching by 23% and 20%, respectively in the Manawatu site relative to urine-only treated lysimeters, but no significant reduction was observed in the Canterbury site. Our results demonstrated the potential application of these treatments in different soils under different climate and management conditions.
这项蒸渗仪研究调查了2020年5月至12月期间，在新西兰马纳瓦图（正构浮石土）和坎特伯雷（浅色正构棕色土）的蒸渗仪田间场地，晚秋施用双氰胺（DCD）、共聚丙烯酸 - 马来酸（PA - MA）、木质素磺酸钙（LS）、木质素磺酸钙分次施用（2LS）以及赤霉素（GA）和LS组合（GA + LS）对减少氮淋失损失的影响。在第二次施用中，2020年7月在两个场地的冬季中期仅施用尿液、仅施用GA以及施用GA + LS处理。结果表明，与仅施用尿液相比，在马纳瓦图场地，晚秋施用DCD、2LS和GA + LS分别使矿质氮淋失减少了8%、16%和35%，在坎特伯雷场地分别减少了34%、11%和35%。两个场地经尿液处理的蒸渗仪之间，累积牧草氮吸收量和产量均无显著增加。相对于仅用尿液处理的蒸渗仪，在马纳瓦图场地，冬季中期施用GA和GA + LS分别使矿质氮淋失减少了23%和20%，但在坎特伯雷场地未观察到显著减少。我们的结果证明了这些处理在不同气候和管理条件下不同土壤中的潜在应用。
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