3种水稻缓/控释肥一次性施用效果比较

为了比较3 种水稻缓/控释肥一次性施用的效果，通过盆栽试验，测定了3 种水稻缓/控释肥A、B、C处理后水稻叶片叶绿素SPAD值、生物量、植株吸氮量、土壤有效氮、产量、氮素农学利用率等指标。结果显示：3 种缓/控释肥都具有较好的供肥能力，经肥料A、B、C处理后，与未施氮的对照相比，开花期土壤有效氮分别提高了39.79%、46.31%、43.05%，水稻产量分别提高了34.72%、53.09%、41.38%；肥料A、B、C的氮素农学利用率分别为15.0、22.9、17.8 kg/kg。3 种缓/控释肥均能明显增加叶片的叶绿素含量、促进水稻植株氮吸收，从而促进水稻生长，提高其生物量和产量；一次性施用能满足水稻整个生育期的肥料需求；3种缓/控释肥的综合效果优劣次序为肥料B＞肥料C＞肥料A。

Comparison of One-time Application Effect of Three Kinds of Slow/Controlled Release Fertilizers on Rice

In order to study the one-time application effect of three kinds of slow/controlled release fertilizers on rice, the chlorophyll (SPAD value), biomass, nitrogen uptake, soil effective nitrogen, yield and agronomic N use efficiency were determined through pot experiments with three kinds of slow/controlled release fertilizers A, B and C. The results showed that the fertilizers all exhibited high fertility, compared with CK, the content of effective nitrogen in soil after treatment increased 39.79%, 46.31% and 43.05%, the rice yield increased 34.72%, 53.09% and 41.38%, the agronomic N use efficiency of these three fertilizers was 15.0, 22.9 and 17.8 kg/kg, respectively. The fertilizer could significantly increase leaf chlorophyll content, promote nitrogen absorption and rice growth and improve the rice biomass and yield. One-time application of slow/controlled release fertilizer satisfied the growth of rice in all growth periods, and the order of the general effect of these three kinds of slow/controlled release fertilizers was B＞C＞A.