Acta Agriculturae Zhejiangensis ›› 2022, Vol. 34 ›› Issue (10): 2259-2267.DOI: 10.3969/j.issn.1004-1524.2022.10.20

• Environmental Science • Previous Articles     Next Articles

Effect of proportion of slow-release nitrogen in base fertilizer on tillering and nitrogen uptake and utilization of single-cropping late rice

ZHANG Jinping1,2(), CHEN Zhaoming2, WANG Qiang2,*(), MA Junwei2, YU Qiaogang2, YE Jing2, MA Jinchuan2, SUN Wanchun2   

  1. 1. College of Environment and Resources, Zhejiang A&F University, Hangzhou 311300, China
    2. Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
  • Received:2021-09-01 Online:2022-10-25 Published:2022-10-26
  • Contact: WANG Qiang

Abstract:

In the present study, a greenhouse pot experiment was conducted to investigate the effects of application of different proportions of slow-release nitrogen fertilizer (SRN) in base fertilizer on the tillering dynamics, rice growth and nitrogen uptake and utilization of single-cropping late rice, hence to provide theoretical guidance for one-time fertilization technology on rice production. Five treatments were set: N0, no nitrogen; CF, conventional fertilization; 20%SRN, application of 20% (in basal fertilizer, the same as below) N via SRN; 40%SRN, application of 40% N via SRN; 60%SRN, application of 60% N via SRN. It was shown that the changes in the number of tillers over time fit in with the quadratic equation (P<0.05). Compared with CF treatment, application of SRN did not significantly (P>0.05) increase the theoretical maximum tillers and rice spike rate. Besides, application of SRN had no significant effect on rice yield as compared with CF treatment. At the tillering stage and booting stage, no significant difference was found in nitrogen accumulation in roots and shoots in all treatments with N, but the 20%SRN and 40%SRN treatments signficantly (P<0.05) reduced the N uptake and the apparent nitrogen utilization rate at the maturity stage as compared with the CF treatment. In summary, compared with the CF treatment, application of different proportions of SRN in base fortilizer did not increase the ineffective tillers of rice. Among the SRN treatments, the 60%SRN treatment had no significant difference on rice yield, spike rate and nitrogen uptake and utilization as compared with the CF treatment.

Key words: pot experiment, rice, slow-release nitrogen fertilizer, yield, nitrogen use efficiency

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