Balanced Nitrogen Reduction for Improved Grain Yield and Eating Quality in Mechanically Transplanted Hybrid Indica Rice

Ming-Jin Jiang, Wen-Bo Xu, Li-Jiang Li, Jia-Feng Zhang, Rong-Ji Wang, Guang-Mei Ji, Dan-Qiu Luo, Xue-Hai Jiang, Jin-Yu Tian and Min Li ()
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Ming-Jin Jiang: Rice Research Institute, Guizhou Academy of Agricultural Sciences, Guiyang 550006, China
Wen-Bo Xu: Rice Research Institute, Guizhou Academy of Agricultural Sciences, Guiyang 550006, China
Li-Jiang Li: Rice Research Institute, Guizhou Academy of Agricultural Sciences, Guiyang 550006, China
Jia-Feng Zhang: Rice Research Institute, Guizhou Academy of Agricultural Sciences, Guiyang 550006, China
Rong-Ji Wang: Rice Research Institute, Guizhou Academy of Agricultural Sciences, Guiyang 550006, China
Guang-Mei Ji: Rice Research Institute, Guizhou Academy of Agricultural Sciences, Guiyang 550006, China
Dan-Qiu Luo: Rice Research Institute, Guizhou Academy of Agricultural Sciences, Guiyang 550006, China
Xue-Hai Jiang: Rice Research Institute, Guizhou Academy of Agricultural Sciences, Guiyang 550006, China
Jin-Yu Tian: Rice Research Institute, Guizhou Academy of Agricultural Sciences, Guiyang 550006, China
Min Li: Rice Research Institute, Guizhou Academy of Agricultural Sciences, Guiyang 550006, China

Agriculture, 2024, vol. 14, issue 8, 1-16

Abstract: Excessive nitrogen application may adversely impact grain yield and quality of rice. This study aimed to evaluate the impact of several nitrogen-reduction strategies on the grain yield and quality of mechanically transplanted hybrid indica rice. Field experiments were performed in 2020 and 2021 using Yixiangyou2115 and Fyou498. The research investigated variations in grain yield and quality of rice under different nitrogen-reduction strategies, including NR1, balanced N reduction; NR2, N reduction in basal fertilizer; NR3, N reduction in tillering fertilizer; and NR4, N reduction in earing fertilizer, compared to the conventional nitrogen application for high-yield cultivation (CK). Compared to CK, the grain yield of rice decreased by 1.63% to 19.71% under nitrogen-reduction strategies. Relative to NR3 and NR4, NR1 and NR2 exhibited an increase in grain yield ranging from 1.81% to 22.51%, attributed to increases in panicle number (0.61% to 13.19%) and spikelet number per panicle (1.60% to 12.28%). Meanwhile, NR1 and NR2 also had relatively high LAI and dry matter accumulation in rice plants at maturity. Compared to CK, NR1 and NR2 improved the processing quality of rice grain, while NR3 and NR4 resulted in reduced processing quality. The chalkiness rate and chalkiness degree of rice under the NR1, NR3, and NR4 treatments were reduced by 2.97% to 23.73% and 3.35% to 52.49%, respectively, in comparison to CK. Additionally, the NR1 and NR4 treatments were linked to an increase in taste value by 1.44% to 3.66% and gel consistency by 13.87% to 46.01% relative to CK. These findings suggest that balanced nitrogen reduction can maintain a high yield while improving the appearance and eating quality of mechanically transplanted hybrid indica rice. This study offers a theoretical basis for rational nitrogen reduction and high-quality cultivation in rice.

Keywords: hybrid indica rice; nitrogen reduction; grain yield; rice quality (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2024
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