论文部分内容阅读
包衣控释肥在土壤中释放规律的评价及预测对其推荐施肥有重要作用。通过室内恒温、不同含水量的土培和田间裸地试验,研究了土壤温度和含水量对控释肥(树脂包衣尿素,简称L1)氮素释放的影响,并用SUGIHARA模型预测L1在不同施肥时期的氮素释放规律。结果表明:温度是影响L1释放的主要因素;土壤含水量高于田间持水量的35%后,L1的释放不受含水量变化的影响;SUGIHARA模型适合对L1的氮素释放进行拟合,其中溶出速率常数K由温度决定,不同施肥期对应的K值不同,二者有很好的相关性。经检验,SUGIHARA模型可用于预测不同施肥时期的树脂包衣控释肥在土壤中氮素释放。
Evaluation and prediction of the rule of release of coated controlled release fertilizer in soil plays an important role in its recommended fertilization. Effects of soil temperature and water content on nitrogen release from controlled release fertilizer (resin-coated urea, referred to as L1) were studied by experiments of soil temperature and water content in nursery soil and fields under constant water temperature and different soil moisture content. Period of nitrogen release law. The results showed that temperature was the main factor affecting the release of L1. After the soil moisture was higher than 35% of the field capacity, the release of L1 was not affected by the change of water content. The SUGIHARA model was fit for the release of nitrogen from L1, The dissolution rate constant K is determined by the temperature, and the K values corresponding to different fertilization periods are different, and the two have a good correlation. After testing, SUGIHARA model can be used to predict the release of nitrogen from soil-bound resin-coated controlled-release fertilizer in different fertilization periods.