Abstract
Many field studies have been conducted to determine the influence of various nutrient element applications on the yield of soybeans. It has been reported in the literature that when soybeans were grown on the more productive soils, they showed a rather indifferent response to the direct applications of fertilizers. In general, marked increases in the yield of soybeans have been obtained from the use of potassium fertilizer on potassium deficient soils (51). However, yield increases of soybeans from applications of other macro-nutrient elements have been of smaller magnitudes than were anticipated from the levels of the nutrient elements in the soil. It was reasoned that information on the interrelations between macro-nutrient elements would provide a basis for interpreting response or lack of response of soybeans to applications of fertilizers under field conditions. Furthermore, it seemed possible that symbiotic nitrogen-fixing bacteria may also influence the response of soybean plants to soil applications of major nutrient elements.
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Claims 0
Judged core plant research, but no claim was extracted from this abstract.