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Chinese Agricultural Science Bulletin ›› 2021, Vol. 37 ›› Issue (34): 1-8.doi: 10.11924/j.issn.1000-6850.casb2020-0672

Special Issue: 水稻

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Effects on Grain Yield, Nitrogen Uptake and Utilization of Japonica Rice on Yunnan Plateau Under Different N Fertilizer Levels

Zhang Jinwen(), Deng Wei, Lv Yonggang, Lv Ying, Xu Yuran, Gu Anyu, Nian Wei, An Hua, Dong Wei, Li Xiaolin()   

  1. Institute of Food Crops, Yunnan Academy of Agricultural Sciences, Kunming 650200
  • Received:2020-11-18 Revised:2021-09-16 Online:2021-12-05 Published:2022-01-06
  • Contact: Li Xiaolin E-mail:zhangjw0098@163.com;xiaolinli@163.com

Abstract:

The objective of the experiment is to study the effects of different nitrogen fertilizer levels on the yield, growth, dry matter accumulation and nitrogen uptake and utilization of japonica rice on Yunnan Plateau, and provide a basis for reduced application of nitrogen fertilizer. In this research, non-glutinous japonica rice ‘Chujing 28’ and glutinous japonica rice ‘Yunkejing 1’ were selected as the test materials. Based on the local conventional nitrogen fertilizer application method, 5 treatments of nitrogen level 0, 75, 150, 225 and 300 kg/hm 2 (N0, N1, N2, N3 and N4) were set up in the test. The results showed that the yield of the 2 japonica rice varieties increased with the application of nitrogen fertilizer increase. With N1 treatment, the yield and yield increase of ‘Yunkejing 1’ were significantly higher than that of ‘Chujing 28’, under other nitrogen level treatments, the yield of ‘Chujing 28’ was higher than that of ‘Yunkejing 1’. With the application of nitrogen fertilizer, ‘Chujing 28’ had bigger effective panicle number and higher seed setting rate, which were higher than that of ‘Yunkejing 1’ by 13.36% and 6.24% on average. Nitrogen fertilizer prolonged ‘Chujing 28’ growth stage by 1-8 days and increased the total number of leaf by 0-1, and prolonged ‘Yunkejing 1’ growth stage by 2-9 days and increased its total number of leaf by 0.3-1.1. The dry matter accumulation and total nitrogen absorption of ‘Chujing 28’ were higher than that of ‘Yunkejing 1’ by 4.42% and 18.43% on average, and the nitrogen fertilizer absorption efficiency of ‘Chujing 28’ was higher than that of ‘Yunkejing 1’ by 2.66%. In conclusion, the yield and nitrogen uptake and utilization efficiency of non-glutinous japonica rice are higher than that of glutinous japonica rice. The suitable nitrogen fertilizer level is 225 kg/hm2 for non-glutinous japonica rice ‘Chujing 28’ and 150 kg/hm 2 for glutinous japonica rice ‘Yunkejing 1’.

Key words: non-glutinous japonica rice, glutinous japonica rice, nitrogen fertilizer levels, yield, nitrogen uptake and utilization

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