不同氮水平对大棚莴笋产量及氮肥利用率的影响

Effects of Different Nitrogen Levels on Yield and Nitrogen Use Efficiency of Lactuca sativa L.in Greenhouse

为掌握本地潮土—灰泥土条件下大棚莴笋氮肥最佳施用量,开展了不同氮水平对大棚莴笋产量及氮肥利用率影响的研究。试验结果表明,莴笋产量及经济效益随氮肥施用量的增加呈先上升后下降的趋势,依据偏导理论,经回归分析,得出大棚莴笋最佳施氮量为14.59 kg/667 m2,产量4073.27 kg/667 m2。

In order to grasp the best nitrogen application amount of lettuce(Lactuca sativa L.)in greenhouse in Guichi district,the effects of different nitrogen levels on the lettuce'yield and nitrogen use efficiency were studied.The results showed that the yield and the economic benefit increased first and then decreased with the increase of nitrogen application amount.According to the theory of partial derivative and regression analysis,the best nitrogen application amount of lettuce ingreenhouse was 14.59 kg/667 m2,and the yield was 4073.27 kg/667 m2.