关键词: 半干旱区, 作物, 生长模拟, 水肥补偿

Abstract: The numerical simulation of crop growth status under different moistures and rat e of fertilizer application have been completed. The results show that the yield of spring wheat has the rising tendency with soil moisture rising in the gradients of moisture movement. The maximum yield of spring wheat is 462.35 g·m - 2 under experimental conditions. The deficiency of soil moisture in farmland m ay be compensated in definite limitation by adequate fertility. The compensating mechanism is that the increasing of soil nutrient make it possible to enlarge roots and thus enhance the ability of root imbibing water. Moreover, the results of simulating calculation indicate that it has the best effect under the condition of water abundance by medium fertilizer applying. It offers a quantitative ground for controlling the moisture and the amounts of fertility in semi-arid far m fields.

Key words: semiarid area, crop, growth simulation, water and fertilizer compensation