以盐碱土和盆栽野生大豆为研究对象，测定土壤中N、Na+、K+、Ca2+、Mg2+、Cl-、HCO3-、SO42-、CO32-和野生大豆根、茎叶、种子的氮含量，研究野生大豆对盐碱土的影响。结果表明：野生大豆能够提高盐碱土的氮含量。在花期和收获期土壤氮含量比原盐碱土分别提高了98和113%。野生大豆能够有效降低盐碱土的各种水溶性盐离子的含量和总量。在收获期土壤Na+、Cl-、HCO3-和SO42-含量比原盐碱土分别降低了94.9、85.3、47.6和95.5%；土壤可溶性盐离子总量比原盐碱土降低了90.5%。野生大豆对于盆栽盐碱土有改良作用。在收获期，野生大豆地上部分生物量很大，且在各个生长期的盐度下都能很好生长，具有绿化盐碱地的作用。

Using saline soil and wild soybean as object, the amount of N of wild soybeans’ root, stalk and seed and N, Na+,K+,Ca2+,Mg2+,Cl-,HCO3-,SO42-and CO32-in the soil was measured. The research discussed what effect the wild soybean would produce to saline soil. The results showed that the amount of N in saline soil would be validly increased by planting wild soybean in the saline soil at pot. In the terms of flower and harvest, the amount of N in the soil was more 98 and 113% than that in the uncultured saline soil. The amount of ions in the soil with dissolving water and its sum were decreased by planting wild soybean in the saline soil at the pot. In the term of harvest, the amount of Na+,Cl-,HCO3-and SO42- in the soil at the pot was less 95.2,85.3,47.6 and 95.5% respectively than that in the uncultured saline soil; the sum amount of water-solubility saline ions in the soil was less 90.5% than that in the uncultured saline soil. It would produce the effect of meliorating saline soil at the pot. In the term of harvest, the over ground biology quantity of the wild soybean was very large and wild soybean would grow in every salinity of the term of growing. It would make the saline soil be covered with plants