季节性干旱条件下氮肥与密度运筹对鲜食糯玉米产量的影响

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为探讨季节性干旱下糯玉米的高产栽培模式,本试验研究了氮肥和密度运筹下糯玉米的产量与氮肥农学利用率。结果表明,在9至11月的干旱条件下,随着密度和施氮量的增加,鲜果穗产量逐渐增加,在氮肥用量(225 kg/hm2)和6万株/hm2处理下玉米鲜果穗产量最高,比不施氮处理提高了32.29%。氮农学效率表现较高的为中施氮量(175 kg/hm2)、中密度(5.25万株/hm2)和中施氮量(175 kg/hm2)、高密度(6万株/hm2)处理,分别为10.57 kg/kg和11.79 kg/kg,表现最低的为高施氮量(275 kg/hm2)、低密度(4.5万株/hm2),为3.76 kg/kg。因此,在南方红壤地区,通过合理搭配氮肥量和种植密度,可以在季节性干旱下实现鲜食糯玉米的高产。 In order to explore the high-yielding cultivation mode of waxy corn under seasonal drought conditions, this experiment studied the yield of waxy corn under nitrogen fertilizer and density management and the agronomic efficiency of nitrogen fertilizer. The results showed that under the drought condition from September to November, the fresh ear production increased with the increase of the density and nitrogen application rate. Under the nitrogen application rate (225 kg / hm2) and the treatment of 60 000 / hm2, the fresh ear yield The highest, than the non-nitrogen treatment increased by 32.29%. Nitrogen efficiency of high-yielding agronomic treatments were high nitrogen (175 kg / hm2), medium density (52500 plants / hm2) and medium nitrogen (175 kg / hm2) and high density (60 000 plants / hm2) , Respectively, at 10.57 kg / kg and 11.79 kg / kg, with the lowest performance rates being high nitrogen application (275 kg / hm2) and low density (4.5% / hm2), 3.76 kg / kg. Therefore, in the red soils of South China, the high yield of fresh waxy corn can be achieved under the seasonal drought by reasonably matching the amount of nitrogen fertilizer and planting density.
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