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本文采用田间试验和统计分析方法定量地研究了黄土高原南部典型旱作农田的水肥效应,得出了小麦和玉米在试验年份的水分满足程度和农田水分供需平衡过程。指出,影响该区当前作物产量提高的主要限制因素是肥力,而不是水分。本文再次明确指出土壤水库在旱农条件下作物供水调节中的不可替代作用。根据全生育期中土水势剖面的变化再次提出低土水势水分的较高有效性问题。本工作所取得的结论对发展黄土高原南部旱作农业是极为重要的。
In this paper, field experiments and statistical analysis methods were used to quantitatively study the effects of water and fertilizer on the typical dry farmland in southern Loess Plateau. The water satisfaction of wheat and maize in the experimental year and the balance of water supply and demand in farmland were obtained. Pointed out that the main limiting factor affecting the current increase in crop yields in the area is fertility, not moisture. This article once again clearly pointed out that soil reservoirs can play an irreplaceable role in the regulation of crop water supply under the conditions of dry farming. According to the change of soil water potential during the whole growth period, the issue of the higher validity of the water potential in lower soil is put forward again. The conclusion reached in this work is of great importance to the development of dry farming in the southern Loess Plateau.