单季晚稻施用长效碳酸氢铵效果研究

The Fertilizer Efficiency of Controlled Release Ammonium Bicarbonate of Single-season Rice in Songjiang

实验室模拟试验和田间试验结果表明，表施和混施长效碳铵较普通碳铵可在一定程度上减少氨的挥发损失；长效碳铵有一定的硝化抑制作用；长效碳铵施用量比经验施肥量减少１９５ｋｇ／ｈｍ２时，水稻产量不下降；采用二次曲线校正方程ｙ＝ａ＋ｂｘｋ＋ｃｘ２ｋ，能更准确地模拟碳铵肥料效应特征，对长效碳铵取ｋ＝１．１、普通碳铵ｋ＝１．２、二者在达到基本一致的最高产量时，长效碳铵的每公顷施用量比普通碳铵节省约７０ｋｇ。

The good fertilizer efficiency of controlled release ammonium bicarbonate on single-season rice in blue-violet mud in Songjiang county was presented. The results of laboratory and field trials showed as follows: The volatilization of ammonium bicarbonate was reduced to some extent than that of common ammonium bicarbonate while fertilizer was applied on the surface or mixed with soil; the controlled release ammonium bicarbonate reduced nitrification to some extent; there was no rice yield difference between application of 900kg/hm 2 controlled release ammonium bicarbonate and 1095kg/hm 2 common ammonium bicarbonate; justified regression curve equation of y=a+bx k+cx 2k was adopted ,it can simulate the charateristic of fertilizer efficiency accarately; for controlled release ammonium bicarbonate k=1.1 and common ammonium bicarbonate k=1.2, the optimum yield would be obtained, and the applied amount might save controlled release ammonium bicarbonate of 70kg/hm 2 less than common fertilizer.