| Effects of fertilizer N and P on winter wheat yield and water balance in different years of precipitation |
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| DOI：10.7606/j.issn.1000-7601.2011.03.29 |
| Key Words: winter wheat fertilizer N and P precipitation year dry matter accumulation yield water use efficiency |
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| Abstract: |
| Field experiments were conducted to investigate the effects of combined application of fertilizer N and P
on wheat yield and water use efficiency in different years of precipitation. Pupose of the study was to provide a theoreti-cal basis of the combined fertilizer applicat ion model suitable to soil water conditions for the improvement of soil water in wheat yield. Results showed that (1) under the experimental conditions, both yield and water use efficiency with high N and P treatments were the highest in contrast to control treatment (CK). Wheat yield was increased by 68. 37% and 62.95% in drought year and normal year and water use efficiency， 36.72% and 31.21%， respectively. (2) In different years of precipitation, the treatments had the order of high N> >low N> CK for all of leaf weight，com straw weight，grain weight and 1000 grain weight. The five different treatments，for grain yield and water use efficiency，were in the order of high N and high P >high N and low P >low N and low P> low N and high P> >CK. In different years of precipitation, rational fertilization can siqnificantly increase wheat dry matter accumulation and yield and effectively improve water use efficiency as well. In high N treatment ，the result was especially prominent. |