Effects of Different Soil Water Conditions and Phosphorus Application on Dry Matter Accumulation and Water Consumption of Wheat

In order to clarify the rational regulation of different water conditions and phosphorus application,a rain-proof pool culture experiment,including two water levels of W1,moderate soil water content(75%) and W2,water stress(55%),and three fertilizing levels of P1(75 kg/ha),P2(150 kg/ha) and P3(225 kg/ha) was conducted.The results showed that the two factors of water and phosphorus have important impact on dry matter accumulation and water consumption of wheat.The ratio of stored assimilation after anthesis contribution to grain in treatment P2 was higher than the other treatments under W1.The transportation and contribution of stored assimilation to grain after anthesis in W2 were higher than those in W1.Transportation and the ratio of contribution increased with the increase of phosphorus application under W2.Water consumption increased and WUE declined with the increase of soil water content.Water consumption and WUE of 150 kg/ha phosphorus treatment was the highest under W1,and it was not significant under W2.Considering both yield and WUE of wheat in the experiment,though W2P2 achieved the highest yield,compared with W1P2,there was no siganificant difference.WUE of W1P2 was the highest among those treatments.Therefore,the W1P2 treatment was the better combination of water and fertilizer.