晚稻种衣肥ZFWW-6的养分释放特性

目的]研究晚稻种衣肥ZFWW-6的养分释放特性。方法]用ZFWW-6制备包肥种子,测定种衣肥中养分N、P、K的初期释放率、微分释放率、累积释放率和养分释放期,探讨温度、肥水比及pH对养分释放的影响。结果]种衣肥中N、P、K的初期释放率30.00%,微分释放率2.00%;养分N、P、K的释放期分别为62.2、57.8和79.5 d。温度、肥水比和pH对晚稻种衣肥养分的释放有一定的影响,可能是这些因素能改变养分的溶解速率、扩散速率等所致。结论]该晚稻种衣肥的养分缓释特性良好。

Nutrient-release Properties of Later-rice Seed-coating Fertilizer ZFWW-6

Objective]To explore the slow-release properties of later-rice seed-coating fertilizer ZFWW-6.Method]The initial release rate, differential release rate, cumulative release rate and nutrient release-duration of N,P,K in later-rice seed coated by fertilizer ZFWW-6 were determined.Influences of environmental factors including temperature,fertilizer-water ratio and pH on nutrient release were experimented pre-liminarily.Result]The initial release rates of N,P,K in this seed-coated fertilizer were less than 30.00%,and the differential release rates of N,P,K were less than 2.00%;The release duration of N,P,K in this fertilizer were 62.2,57.8 and 79.5 d,respectively.Environmental fac-tors such as temperature,water ratio and pH could influence the release of nutrients in this fertilizer,and the possible reason was that these fac-tors could change the rates of dissolution and diffusion of nutrient in this fertilizer.Conclusion]The slow-release properties of ZFWW-6 were good.