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为进一步提升膜下滴灌玉米产量,2014-2015年以玉米杂交种辽单1211为材料,研究了追施不同形态氮素对膜下滴灌玉米光合特性、干物质积累量和子粒产量的影响。结果表明,灌浆期玉米叶片净光合速率追施氮肥处理显著高于对照,其中硝酸铵处理光合速率最大,其次为硝酸钙处理,二者净光合速率与氯化铵、硫酸铵、尿素处理差异显著;各生育时期玉米干物质积累量以硝酸铵处理最高,与其他追施氮肥处理差异显著;追施氮肥处理的产量显著高于对照,其中以硝酸铵处理产量最高,其次为硝酸钙处理,氯化铵处理产量较低,各处理主要是通过影响粒重来影响玉米产量。膜下滴灌追施硝酸铵可显著提高玉米产量。
In order to further enhance the yield of drip irrigation under mallow, the effects of topdressing different forms of nitrogen on photosynthetic characteristics, dry matter accumulation and grain yield of maize under drip irrigation were studied using Lidan 1211, a maize hybrid from 2014 to 2015. The results showed that the net photosynthetic rate of maize leaves under topdressing nitrogen application was significantly higher than that of the control at the filling stage, of which ammonium nitrate treatment had the highest photosynthetic rate, followed by calcium nitrate treatment, the net photosynthetic rate was significantly different from ammonium chloride, ammonium sulfate and urea treatment The dry matter accumulation of maize at each growth stage was the highest with ammonium nitrate treatment and the other topdressing nitrogen treatments were significantly different. The topdressing nitrogen fertilizer treatment yield was significantly higher than that of the control. Among them, ammonium nitrate treatment had the highest yield, followed by calcium nitrate treatment, The output of ammonium treatment is lower, and the treatment mainly affects the corn yield by affecting the grain weight. Topdressing ammonium nitrate under drip irrigation can significantly increase maize yield.