Abstract:

To explore the characteristics of phosphorus efficiency of soybean seedlings, study the relationship of phosphorus efficiency of soybean and its component factor. This test use 4 "P-inefficient" soybean genotypes D03, D05, D17 and D18 and the "phosphorus efficiency" soybean genotypes D31, D34, D37 and D38, using soil culture experiment, set high、low-phosphorus treatment, the relationship of phosphorus efficiency of soybean genotypes and its component were studied. The results showed that low-phosphorus treatment, the four P efficient genotypes seedling plants P uptake than those evident advantages, D34 showed strong ability to absorb phosphorus, but there are three phosphorus efficient genotypes, phosphorus utilization efficiency adaptive advantage is not shown, only the D37 showed strong ability to make use of phosphorus. Correlation and path analysis showed that the level of phosphorus efficiency of soybean mainly by the strength of P uptake capacity determined, (-P) treatment significantly higher than (+P) treatment. P uptake and P utilization efficiency of a direct impact on the efficiency of phosphorus are large, but the far greater contributions to P uptake, while the indirect effects were relatively small. Low-phosphorus stress, phosphorus efficient genotypes are different mechanisms to adapt to the low, phosphorus uptake efficiency that P uptake is different phosphorus efficiency of soybean genotypes at seedling stage a major source of variation.