缓释肥料棒氮钾缓释特性研究

采用室内间歇式土柱淋溶试验,研究了缓释肥料棒氮钾在土壤中的淋出率,以期明确缓释肥料棒对氮钾的缓释效果。结果表明,缓释肥料棒可明显减缓氮钾淋出,减少氮、钾淋出量,对氮、钾具有缓释作用,且随着聚丙烯酰胺用量增加,缓释肥料棒氮、钾累积淋出率逐渐减小。当42 d淋溶时,聚丙酰胺用量为2%、4%、6%的缓释肥料棒氮素累积淋出率分别较普通肥料减少了10.91%、16.85%、21.93%,且处理间差异显著;钾素累积淋出率较普通肥料分别减少了26.28%、29.16%、32.61%。而且一级动力学方程对缓释肥料棒的氮、钾累积淋出率曲线拟合效果最佳,可用于表征氮、钾素累积淋出率与时间的关系。

Nitrogen and Potassium Slow Release Characteristics of Slow Release Fertilizer Rods

In order to determine the nitrogen and potassium slow-release effect of slow release fertilizer rods, an intermittent soil column leaching experiment was used to research the nitrogen and potassium leaching rate of slow release fertilizer rods in soil. The results showed that slow release fertilizer rods could obviously reduce nitrogen and potassium leaching loss, had good slow release effect, and with the increasing of polyacrylamide, the nitrogen and potassium accumulated leaching rate decreased. Compared to ordinary fertilizer, the nitrogen accumulated leaching rate of FR1, FR2, FR3 decreased by 10.91%, 16.85%, 21.93% in the 42 days leaching, respectively; the potassium accumulated leaching rate decreased by 26.28%, 29.16%, 32.61%, respectively. And the nitrogen and potassium accumulated leaching rate curve could be best simulated by first order kinetics equation, could be used to describe the relationship between nitrogen/potassium accumulated leaching rate and time.