Impact Of Permanent Raised Bed Water And Nitrogen Coupling On Root Growth And Yield Of Spring Wheat

For the irrational use of water and nitrogen in a fixed path under permanent raised bed, resulting in growth of spring wheat, used spring wheat for test material, to test materials of different water and nitrogen on spring wheat root dry weight, root length, diameter, volume and surface area impact on production and regulation of, in order to improve the yield of spring wheat to provide a theoretical basis. Field experiment was carried out different irrigation system levels, the main area of irrigation quota, set three irrigation quota W1(2250m3/hm2), W2(3000m3/hm2), W3(3750m3/hm2), a sub-district of fertilizer, set 4 nitrogen levels N0(0 kg/hm2), N1(150 kg/hm2), N2(300kg/hm2), N3(450kg/hm2), the main findings are as follows:1.No significant effects on leaf area index of wheat moisture, N significantly affected leaf area index of wheat, water and nitrogen interaction on the leaf area index. Different irrigation quota, N2 can improve wheat leaf area index. No significant effect on dry matter accumulation of wheat moisture content, N and water-nitrogen coupling significant effect on dry matter accumulation of spring wheat, and after flowering gradually increased with time. Under different moisture conditions, N0 minimum dry matter, N3 is highest. Late flowering of spring wheat, spring wheat under different water condition on dry matter increase with increasing amount of nitrogen.2.Different water and nitrogen coupling of spring wheat root dry weight,root length, diameter, root surface area and volume rendering plant growth first increased and then decreased moisture on wheat root dry weight,root length, diameter, surface area, volume and had no significant impact, and N and of water and nitrogen coupling has a significant impact. Vertical distribution of dry weight of root system was mainly distributed in 0~20cm soil layer, steep decline in root dry weight of 20 cm, in 50~60cm deep application of nitrogen in soil do not root dry weight than nitrogen yield, root dry weight and the root length N0 nitrogen application were higher than the other nitrogen treatment, the root length without nitrogen application was less than nitrogen treatment in 0~20cm soil layer. At booting stage, filling stage and maturity stage with different water and nitrogen treatments, the root length is highest in W2N3 and W3N1. At 0~20cm soil layer, the diameter, volume and root surface area of wheat with W1 and W2 treatment was rank in the order of N0<N1<N2<N3, in 50~60cm soil layer. At the treatment of W2N3, the diameter, volume and root surface area of wheat were the highest.3.Under the same irrigation quota, yields increase with increasing amount of nitrogen, but under high irrigation quota, when the amount of nitrogen over 300kg/hm2, production slowly decreased. Irrigation quota 3000m3/hm2,highest amount of nitrogen in the 300kg/hm2 yield of spring wheat, is a combination of water and nitrogen optimal. Wheat thousand grain weight,grain number per spike and grain weight per spike were significantly different, spring wheat root dry weight, root length, diameter, volume and surface area with thousand grain weight and grain yield showed positive correlation between wheat on shoot dry matter and grain yield were positively correlated.