Modelling the optimal phosphate fertiliser and soil management strategy for crops
Modelling the optimal phosphate fertiliser and soil management strategy for crops
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DOI：
10.1007/s11104-015-2543-0
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发表时间：
2016-04-01
期刊：
影响因子：
4.9
通讯作者：
Roose, T.
中科院分区：
文献类型：
--
作者：
Heppell, J.;Payvandi, S.;Roose, T.
随时可用的全球磷矿(P)储量可能在未来50-130年内耗尽，因此需要谨慎使用这一有限的资源。我们开发了一个模型，允许我们评估一系列大麦的磷肥和土壤管理策略，以找出在特定气候条件下哪种策略能最大限度地增加植物的磷吸收。我们的模型描述了土壤中磷和水分剖面的发展。我们模拟了当前的耕作技术，如耕作和减少耕作梯度，以及肥料选项来喂养表层土壤或种子下面的土壤。我们的模型能够与两个大麦田间试验的数据进行拟合，在生长早期达到了很好的拟合，但在生长后期却很差，因为模型低估了植物对磷的吸收。混合良好的土壤(倒耕和25 cm耕作)对于植物最佳的磷吸收是重要的，并为根系提供最佳的环境。模型对磷的初始状态及其在土壤剖面中的分布很敏感；实验参数是稀疏测量的。模型和实验数据的结合为特定地点提供了有用的农业预测。
The readily available global rock phosphate (P) reserves may be depleted within the next 50-130 years warranting careful use of this finite resource. We develop a model that allows us to assess a range of P fertiliser and soil management strategies for Barley in order to find which one maximises plant P uptake under certain climate conditions.Our model describes the development of the P and water profiles within the soil. Current cultivation techniques such as ploughing and reduced till gradient are simulated along with fertiliser options to feed the top soil or the soil right below the seed.Our model was able to fit data from two barley field trials, achieving a good fit at early growth stages but a poor fit at late growth stages, where the model underestimated plant P uptake. A well-mixed soil (inverted and 25 cm ploughing) is important for optimal plant P uptake and provides the best environment for the root system.The model is sensitive to the initial state of P and its distribution within the soil profile; experimental parameters which are sparsely measured. The combination of modelling and experimental data provides useful agricultural predictions for site specific locations.