RESPONSE AND INTERACTION FOR WATER AND FERTILIZERⅠ INTERACTION OF N, P AND WATER IN THE YEAROF DIFFERENT PRECIPATIONS

By statistical analysis of the 30 years rainfall of Luoyang, Henan Province, the different pattern of annual precipation were stimulated and the water proof sheld was used to study the interaction and response for N, P and water The result of experiment showed that, under the condition of low water content, the favorable yield could also be gotten through coordinating the water and fertilizer; the interaction type of different elements can change under the control of man made In normal year and the year with high water, the interaction for N 1 and water is sequentially additive type, N 2, N 3 and water are synergistic type, and the response of P is lower correspondingly The response of N have a closely relation with soil water content, and the sequence of response of P in different type of year is: the year with low waternormal yearthe year with high water