密度和施氮量对鲜食糯玉米产量的影响

Effects of Planting Densities and Nitrogen Application Rate on Yield of Table Waxy Corn

采用密度和施氮量两个因子对鲜食型玉米产量进行裂区试验研究。结果表明,中密度(8.25万株/hm2)下的单位面积全株鲜物质产量、鲜果穗产量和干果穗产量最高,分别比低密度(6.00万株/hm2)和高密度(10.50万株/hm2)增产27.91%和0.59%、16.57%和2.60%、15.11%和1.31%;高密度下的单位面积全株干物质产量最高,分别比低密度和中密度增产1.57%和22.84%。随施氮量的增加,单位面积全株鲜物质产量逐渐提高,以高施氮量(500kg/hm2)最高;单位面积全株干物质产量、鲜果穗产量和干果穗产量均表现先增后降,以中等施氮量(300 kg/hm2)最高。

The result of a split-plot experiment showed that unit area yield of whole-plant fresh matter, fresh and dry ears reached highest on occasion of medium planting density with 82 500 plants/ha. Compared with the occasion of low density with 60 000 plants/ha, the respective yield was increased by 27.91%, 0.59% and 16.57%; and with high density with 105 000 plants/ha, respectively by 2.60%, 15.11% and 1.31%. Unit area yield of whole-plant dry matter reached highest on occasion of high density. The respective yield was increased by 1.57% on condition of low density and 22.84% on condition of medium density. With the increasing amount of nitrogen application, the unit area yield of whole-plant fresh matter went up gradually and reached highest on occasion of high nitrogen application with 500 kg/ha. Meanwhile, the unit area yield of whole-plant dry matter, fresh and dry ears all decreased after initial increasing but reached highest on condition of medium nitrogen application with 300 kg/ha. Among all treatment combina- tions, the unit area yield of whole-plant dry matter, fresh and dry ears was higher or highest on condition of medium nitrogen application with 300 kg/ha while the unit area yield of whole-plant dry matter was highest on condition of high nitrogen application with 500 kg/ha with medium density.