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A Reduced Phosphorus Application Rate Using a Mycorrhizal Plant as the Preceding Crop Maintains Soybean Seeds’ Nutritional Quality

Sha, Zhimin, Watanabe, Toshihiro, Chu, Qingnan, Oka, Norikuni, Osaki, Mitsuru, Shinano, Takuro
Journal of agricultural and food chemistry 2018 v.67 no.1 pp. 32-42
Helianthus annuus, crops, fertilizer rates, filling period, iron, manganese, mycorrhizal fungi, nutrients, nutritive value, phosphorus, phosphorus fertilizers, phosphorus pentoxide, seeds, soybeans
We tested whether introducing an arbuscular mycorrhizal fungi (AMF)-host plant with a reduced P application rate could maintain soybean seeds’ nutrient quality. The dynamic variation of 14 nutrients was analyzed in source and sink organs during the seed-filling stage. The AMF-host and non-AMF-host plants, sunflower and mustard, were grown as preceding crops (PCs). Soybeans, the succeeding crops, were planted with three different phosphorus levels, namely, 0, 50, and 150 kg P₂O₅ ha–¹. The results showed that the AMF-host PC with a reduced P application rate maintained the seed’s yield and nutrients quality. During the seed-filling stage, the AMF-host PC with a reduced P application rate increased the uptake of most nutrients compared to the non-AMF-host PC, and improved the remobilization efficiency of all nutrients except Mn, Fe, and Se, compared to the optimal P application rate. These results could help improve the utilization efficiency of P fertilizers and protect soybeans’ nutritional value.