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以水稻和玉米为供试作物进行盆栽试验和田间试验。结果表明,水稻和玉米的增产效应均表现为;缓释尿素基追施结合处理>普通尿素基追施结合处理>缓释尿素一次性基施处理>普通尿素一次性基施处理。处理间差异达显著或极显著水准。相比之下,一次性基施改为基追施结合的增产幅度要优于尿素缓效化的肥效。两种作物对尿素的氮素利用率范围值分别为54.8%~70.1%(水稻)和53.6%~59.1%(玉米),其规律与上述肥效相吻合,也是各处理增产的内在原因。在水稻和玉米生产中应推荐在施用PK肥基础上,缓释尿素85%作基肥、15%作追肥这一施肥方法。
Rice and corn were used as potted and field experiments. The results showed that both the yield-increasing effects of rice and maize were as follows: slow-release urea combined with top-dressing treatment> common urea combined with top-dressing treatment> one-time base treatment of slow-release urea> one-time base treatment of ordinary urea. Differences between treatments were significant or highly significant. In contrast, the one-time base to top-dressing combined with the rate of increase is better than urea slow-release fertilizer. The range of nitrogen use efficiency of two crops to urea was 54.8% -70.1% (rice) and 53.6% -59.1% (maize), respectively. The regularity was consistent with the above mentioned fertilizer efficiency, which was also the internal reason for the increase of yield. In the production of rice and corn should be recommended based on the application of PK fertilizer, slow release of 85% of urea as a base fertilizer, 15% for top dressing this fertilization method.