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Co-incorporation of Chinese milk vetch and chemical fertilizers ameliorates chlorophyll content, nitrogen uptake and soil property favouring rice quality

Year: 2025

Type: article

Abstract: The objective of this study was to assess the impact of the time and rate of co-incorporation of Chinese milk vetch (CMV) with chemical fertilizers on rice quality and associated factors in South China. Here, a pot experiment with an orthogonal design L 9 (3 3 ) was conducted to study the effect of the co-incorporation practices on rice quality, leaf chlorophyll, nutrient uptake and soil property. Results showed that co-incorporation of CMV (5288 kg dry CMV ha − 1 ) with chemical fertilizers (108 kg nitrogen (N) ha − 1 , 23 kg phosphorus (P) ha − 1 , and 89 kg potassium (K) ha − 1 ) on 7 day before the early rice transplanting (T 4 ) increased methionine and lysine contents by 29.2% and 46.4%, and increased starch and amylopectin by 10.3% and 11.6% compared with those at the conventional level of chemical fertilizer input (137 kg N ha − 1 , 30 kg P ha − 1 , and 56 kg K ha − 1 ) (T 0 ), respectively ( P < 0.05). This was likely attributed to interactions among leaf chlorophyll, N uptake and soil property. The statistical analyses indicated that grain N content, the transport coefficient for N, leaf chlorophyll, soil organic matter, pH, the relative abundances of Actinobacteriota , Patescibacteria , and Rozellomycota were significantly correlated with quality traits of rice grain ( P < 0.05). Overall, the T 4 treatment can modulate leaf chlorophyll, N uptake, soil chemical and microbial properties, and further improve amino acid, starch compositions and contents of rice grain.

Source: Scientific Reports

DOI: 10.1038/s41598-025-26698-3