The effect of nitrogen upon the response of cotton and oats to phosphorus
1944
Coleman, R.
The effect of nitrogen upon the response of cotton and oats to phosphorus in the case of Mississippi soils was determined by greenhouse and field experiments in which different rates of nitrogen was applied with varying amounts of phosphorus. There was a definite relationship between the amount of nitrogen available to cotton and oats and their response to phosphorus. Cotton and oats gave only a slight response to phosphorus which was applied with small amounts of nitrogen, but both crops gave a high response to phosphorus which was applied with large amounts of nitrogen. Plants receiving adequate amounts of nitrogen not only respond better to phosphorus, but they also require larger amounts of it. These results partially explain why many crops do not respond better to phosphorus on southern soils which are low in this element, and they suggest that as long as nitrogen remains a limiting element in these soils, nonlegumes will not respond well to phosphate fertilizer.
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