Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2021, Vol. 37 ›› Issue (6): 30-36.doi: 10.11924/j.issn.1000-6850.casb2020-0159

Special Issue: 玉米 烟草种植与生产

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

Ji Zhenxi(), Cui Yutao, Chen Haodong, Chen Yuan, Dai Jun, Zhang Biao, Zhou Jun, Li Mei, Chen Youjun, Wang Tao, Hu Xiaokang()   

  1. College of Agriculture and Biological Sciences, Dali University, Dali Yunnan 671003
  • Received:2020-06-08 Revised:2020-08-14 Online:2021-02-25 Published:2021-02-24
  • Contact: Hu Xiaokang E-mail:Jixixi0704@163.com;huxiaokangliu@pku.edu.cn;huxiaokangliu@163.com

Abstract:

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 103rd 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.

Key words: sweet corn, nitrogen fertilizer, soluble sugar, reducing sugar, agronomic trait, Erhai watershed

CLC Number: