Research on the Characteristics of Different Phosphorus Efficiency of Soybean Genotypes at Seedlings Stage

[Objective] The research aimed to investigate the characteristics of different phosphorus efficiency of soybean genotypes at seedling stage.[Method] High and low phosphorus soil pot experiment was conducted to study the uptake efficiency and use efficiency of different organs of soybean at seedlings stage.[Result] Under low-phosphorus stress,P uptake of the roots,stems and leaves of soybean genotypes with high phosphorus efficiency was significantly higher than P-inefficient genotype.The absorptive capacity of phosphorus was strong.The main obstacle of P-inefficient soybean genotypes was lower phosphorus uptake efficiency(P uptake)of different organs.Under low phosphorus treatment,the dry weight of the roots,stems and leaves showed significantly or very significantly positive correlation with P uptake and showed negative correlation with phosphorus use efficiency.[Conclusion] The adaptive responses of different soybean genotypes at seedlings stage to low-phosphorus stress could be embodied by phosphorus nutrition efficiency of plants.Under low-phosphorus stress,the phosphorus uptake efficiency(P uptake)is a major variation source of different phosphorus efficiency of soybean genotypes at seedling stage.The roots,stems and leaves of phosphorus-efficient soybean genotypes at seedling stage had stronger absorption and accumulation capabilities,which was the nutrition basis to form more dry matters.