The Study Of High Water Use Efficiency And Controlling Mechanism Of Agronomic Water Saving Regulation Of Soybean

Arid and semi-arid region of inner Mongolia is the important ecological harness areas of china. the deficiency and uneven distribution of water resources, the large supply unbalance of field water and the factors of extensive technology of irrigation , tillage and management lead to strong evaporation of soil moisture, lower soil water storage capacity, severe compensation and lower efficiency of limited water resources. Inner Mongolia is one of the high oil content soybean production bases but the yield is lower than the average yield of the national. So it has important production and application value to realize the high yield and high water efficiency of high oil content synchronously. Further it has important theoretical significance to explore its physiological mechanism.This paper study the growing situation of aerial and underground part and the characteristic of soil moisture dynamics of high soil content soybean under different Film-covering Modes and irrigation of different growth stages. The main results of The physiological mechanism of high yield and high water efficiency of high oil content soybean are following:1. The effect of different film-covering mode to plant height and leaf area index is that covering film between rows(CFBR)is higher than covering film on rows(CFOR)and CFOR is higher than no film covering(NFC). The effect of irrigation under different growth stages to plant height is that irrigation of branching and flowering and bearing and graining(CK2)is higher than irrigation of branching(FZQ), FZQ is higher than irrigation of fiowering(KHQ), KHQ is higher than irrigation of bearing(JJQ), JJQ is higher than irrigation of graining(GLQ)and GLQ is higher than no irrigation of branching and flowering and bearing and graining(CK1).2. Different film-covering modes and FZQ can both enhance the photosynthetic rate and water use efficiency of leaf.3. The water dynamics of soil layer from 0 cm to 100 cm under different film-covering modes and irrigation of different growth stages are obviously present seasonal changes during all growth and are closely related to local meteorological condition. The duration of soil water loss is from seedling to branching. The duration of enormous loss of soil water is from branching to podding. The duration of slow restoration of water soil is from podding to mature stage.4. The effect of different film-covering modes to the dry weight and vigor of soybean root is that CFOR is higher than CFBR and CFOR is higher than NFC. The effect of irrigation under different growth stages to fresh root weight is that CK2 is higher than KHQ, KHQ is higher than JJQ, JJQ is higher than FZQ, FZQ is higher than GLQ, GLQ is higher than CK1, to root vigor is that CK1 is higher than JJQ, JJQ is higher than GLQ, GLQ is higher than KHQ, KHQ is higher than FZQ and FZQ is higher than CK2 and to active absorption area is that FZQ is higher than CK2, CK2 is higher than JJQ, JJQ is higher than GLQ, GLQ is higher than KHQ and KHQ is higher than CK1.5. Irrigation of from CFBR and branching to fiowering realize the unity of soybean high yield and high water use efficiency.