The response of vetch and soybeans to strains of nodule bacteria
1943
Andrews, W.B. | Briscoe, C.F.
Soybeans were inoculated with strains of nodule bacteria with large differences in efficiency and grown on limed and unlimed soil. A similar test was conducted with vetch which received basic slag. The data show that: 1. There was a good correlation between the increase in yield and the increase in nitrogen content of soybeans receiving different strains of nodule bacteria on unlimed soil. 2. There was no correlation between the increase in yield and nitrogen content of soybeans receiving different strains of nodule bacteria on limed soil. 3. All strains of nodule bacteria used on vetch increased the yield and nitrogen content. . Even though strains of nodule bacteria increased the yield of air-dry vetch from 405 to 2,302 pounds per acre, only small differences in percentage of nitrogen resulted within strains. 5. The efficiency of good and poor Wisconsin strains of pea root nodule bacteria was reversed on vetch in Mississippi. The data presented in this paper suggest that: 1. Increase in yield due to inoculation of soybeans and vetch is a single factor which describes the efficiency of soybean and vetch root nodule bacteria, and that nitrogen determinations are not necessary. 2. Climate is a determining factor in the efficiency of pea root nodule bacteria or vetch should not be in the pea cross-inoculation group. 3. Strains of nodule bacteria should be tested on the species of plants on which they are to be used and in the climate the plants are to be grown.
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