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Chinese Agricultural Science Bulletin ›› 2024, Vol. 40 ›› Issue (20): 1-8.doi: 10.11924/j.issn.1000-6850.casb2023-0627

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Impact of Different Crop Rotation Patterns on Quality of Premium-tasting Japonica Rice and Regulatory Effects of Nitrogen Fertilization

SONG Yunsheng(), GU Junrong, JIN Meijuan, CAO Penghui, YU Yajie, YUAN Caiyong, DONG Minghui()   

  1. Taihu Area Institute of Agricultural Sciences, Suzhou, Jiangsu 215106
  • Received:2023-09-04 Revised:2023-12-05 Online:2024-07-15 Published:2024-07-11

Abstract:

This study aimed to investigate the effects of different crop rotation patterns and nitrogen fertilizer strategies on the quality of premium-tasting japonica rice. Experiments were conducted by using three crop rotation patterns, including rice-wheat, rice-milk vetch, and rice-morchella. Two nitrogen fertilizer levels were set, including 10% reduction and the regular application rate. Additionally, four nitrogen fertilizer ratios were set based on the base tiller fertilizer to panicle fertilizer ratio. The results indicated that the rice-morchella rotation pattern, combined with 10% reduction in fertilizer application and 6:4 nitrogen fertilizer strategies, was most effective in optimizing the processing and appearance quality of rice. The brown rice rate, milled rice rate, and heading rice rate reached 85.17%, 80.38%, and 72.60%, respectively. The chalky grain rate, chalky size, and chalkiness were 7.33%, 18.17%, and 1.33%, respectively. In terms of cooking taste and nutritional quality, the rice-milk vetch rotation combined with 10% reduction in nitrogen fertilizer and 6:4 nitrogen fertilizer ratio was the best, and the amylose content, gel consistency, and protein content were 13.68%, 83.94 mm, and 6.65 g/100g, respectively. The rice-morchella rotation, with 10% reduction and 6:4 fertilizer ratio, amylose content, gel consistency, and protein content were 12.41%, 85.14 mm, and 6.23 g/100 g, respectively, which was a relatively better combination. RVA spectrum analysis revealed that both the rice-milk vetch and rice-morchella rotations demonstrated elevated peak viscosity, hot paste viscosity, and breakdown values under 10% reduction and 6:4 ratio. In conclusion, the study confirmed that the quality of premium-tasting japonica rice could be effectively enhanced through reasonable crop rotation and nitrogen fertilizer management strategy. The rice-morchella and rice-milk vetch rotations had positive effects on the processing quality, appearance, cooking taste, nutritional attributes, and RVA spectrum values of rice when subjected to 10% nitrogen reduction and 6:4 fertilizer strategies.

Key words: crop rotation patterns, nitrogen fertilizer strategies, rice quality, premium-tasting japonica rice, RVA spectrum characteristics