氮肥施用量对甜玉米糖分含量及农艺性状的影响

为了阐明氮肥施用量对甜玉米糖分含量及农艺性状的影响,以甜玉米品种'耘甜8号'为试材开展田间实验,设置5个氮肥施用量处理(即0、100、200、300、400 kg N/hm2).结果表明,氮肥施用量与可溶性糖及还原糖含量的线性模型不显著,只是在播种后的第103天,还原糖含量随施氮量的增加而微弱下降.穗重以渐近增长的模式...

Nitrogen Fertilizer Application Rate and Sweet Corn: Effects on Sugar Content and Agronomic Traits

To elucidate the effects of nitrogen fertilizer application rate on sugar content and agronomic traits of sweet corn (Zea mays L. var. saccharata Bailey), a field experiment was conducted with sweet corn variety “Yuntian 8” as the material, and five treatments were set up with nitrogen fertilizer application rate of 0, 100, 200, 300 and 400 kg N/hm². The results showed that, the linear models of the relationship between nitrogen fertilizer application rate and soluble sugar content and reducing sugar content were not significant, only on the 103^rd day after sowing, the reducing sugar content decreased slightly with the increase of nitrogen fertilizer application rate. The response of ear weight to the increase of nitrogen fertilizer application rate presented an asymptotic growth model. When nitrogen application rate exceeded 100 kg N/hm², the extent of the positive response of ear weight to nitrogen application decreased dramatically. Each increment of 100 kg N/hm² decreased the ear length by 0.29 cm. The linear models of the relationships between nitrogen fertilizer application rate and ear diameter, ear row number and grain number per row were not significant. Increasing nitrogen fertilizer application rate could decrease bare tip length. Taken together, increasing nitrogen fertilizer application rate could not affect sugar content, ear diameter, ear row number and grain number per row of sweet corn, and slightly decrease ear length. However, increasing nitrogen fertilizer application rate could significantly increase ear weight and decrease bare tip length.