Effect of soil type and fertilizer on the nitrate content of the expressed sap and the total nitrogen content of the tissue of the small grains
1930
Cook, R.L.
Any fertilizer, with the exception of nitrogen, that increased plant growth had a tendency to decrease the nitrate content of the expressed sap. Nitrogen fertilizers tended to increase the nitrate content of the sap. The total nitrogen content of the dried tissue varied directly with the amount of nitrate in the sap. The stems, as a general rule, contained more nitrate nitrogen in the sap and less total nitrogen in the tissue than did the leaves of the same plants. The size of the plants of the small grains seemed to make no difference in the proportion of stems to leaves. The spring grains possessed greater ability to accumulate nitrate in the sap than did the winter grains. The total nitrogen in the tissue, regardless of fertilizer treatment, declined steadily throughout the growing season. The state of fertility of the soil had more effect than soil type on the nitrate content of the sap and the total nitrogen content of the tissue of the small grains.
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