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Show 'Greeves, Jones: Influence of Inoculation 103 The results obtained. with the field peas are given in table 4. The results obtained with field peas are erratic. During the first eight years there was an increase! in the nitrogen of the inoculated, whereas during the second eight years the nitrogen content of uninoculated was highest. Moreover, throughout the duration of the experiment the field peas grown without green manure were higher in protein than were those grown without green manure. Is this due to a difference between field peas and other legumes considered, or is it experimental? The 5 perecnt level of significance does not point to the latter explanation. The results for soybeans are presented in table 5: The inoculation of soybeans significantly increased the per centage of nitrogen during the first eight years. The increase was from 14.04 to 16.67 percent for the inoculated leaves and stocks, hence the inoculated plants contained 2.63 percent more nitrogen than the uninoculated. Percentages of nitrogen in all crops were much higher duriilg the second eight years than during the first. However, inoculation was without effect upon die percentages of nitrogen in the plants during the second period, but green manure increased the nitrogen content. The soybean soil did not increase in nitrogen when the legume was returned to the same extent as did the other qreen-menure-treated soil. Does this indicate that the soybean tissues decompose more ra pidly than other legumes? If this happens to be the case, although it does not appear likely, it would account for the: increase in nitrogen in the legumes grown with the green manure during the first eight years of the experiment. The results obtained with the table 6. garden beans are given in Inoculation of the garden beans increased the nitrogen con the leaves and stems during the first eight years to where it approached the 5 percent level of significance. Green manure was without effect during the first period and increased the nitrogen content during the second period. tent in The results for the lupines are given in table 7. Inoculation was without effect upon the protein content lupines, but green manure significantly increased the protein content of the plants, throughout the life of the experiment. of The percentage distribution of the nitrogen between leaves and stems and roots of all legumes studied is given in table 8. There is a wide variation in the proportion of the total ni, trogen occurring in stems and leaves and roots of different |
