| Through the field experiment has researched the variation rule of amount nutrient uptake and fertilizer use efficiency in whole growth period of winter wheat. Taking wheat XiNong ‘979’ as test material, adopted. three irrigation levels as W1, W2 and W3, the irrigation quota was 2 400 m3·hm-2, 1 800 m3·hm-2 and 1 200 m3·hm-2, respectively. Four phosphorus fertilizer levels as F1, F2, F3 and F4, the amount of phosphorus fertilizer application (pure P2O5) was 0, 60, 120 and 180 kg·hm-2, respectively. The results showed that: Under the condition of same level of nitrogen fertilize application, the irrigation and phosphorus fertilizer application can be promoted the absorption of nitrogen and phosphorus by crops. With the increase of phosphorus amount, the irrigation water use efficiency and yield will be a remarkable increase. Under F4 treatment condition, the grain yield in treatment W2 was high than W1 and W3 treatment; On the basis of W2,
if increased the irrigation amount, but the grain yields was no significant increase, also the WUE significantly reduced. It explains proper irrigation and phosphorus application will increase the grain yield, but excess irrigation will cause the grain yield decrese. In this experimental condition, the irrigation quota was 1 800 m3·hm-2 and 120 kg·hm-2 of phosphorus fertilizer (pure P2O5) application, the winter wheat growth can be promoted. The compensation effects for soil water shortage by phosphorus application was increased the panicles numbers per unit area, thus increase crop production and improve water and phosphorus utilization efficiency. |