Development a soybean crop model to support production under converted lowland paddies

本研究试图开发一种大豆作物模型，该模型可用于预测土壤水分超标条件下的作物表现。在先前发表的模型(辛克莱，1986)中，纳入了发育阶段的模块。为了建立作物对过量水分的响应模型，进行了两个系列的对照试验。一种是测定土壤温度和氧化还原电位对淹水土壤固氮反应的影响。另一种是叶片生长对过量水分的反应，揭示了不同温度条件下叶片生长反应的共同模式。利用地下水位控制系统和作物对生物量、氮素积累和种子产量的反应数据集，在田间进行了田间试验。田间试验的数据采用了一个初步的模型，该模型解释了由于过量水分而导致的叶面积发育的减少。

This study attempted to develop a crop model for soybean that can be applied to predict crop performance under excess soil moisture condition. To a previously published model (Sinclair, 1986), a module of developmental stages was incorporated. For developing a module of crop response to excess water, two series of controlled experiments were conducted. One was for determination of N fixation response to waterlogging as affected by soil temperature and redox potential. Another was for leaf-growth response to excess water that revealed a common pattern of the leaf-growth response under varied temperature condition. The field experiments conducted on a field facilitated with the system for controlling underground water level and a data-set of crop responses in biomass and N accumulation and seed yield was developed. A preliminary model that accounts for reduction of leaf area development due to excess water was applied to the data from the field experiments.