Varietal variations in the uptake of nitrogen, phosphorus and potassium under stress paddy conditions in soybean (Glycine max (L.) Merrill) [study conducted in the Philippines]
1981
Soetarso
Statistical analysis showed that varietal differences in the ability to utilize nutrients were existent. There was a preponderence of cases of high statistical significance in percentage content of N, P, and K in plant tissues and total nutrient uptake from a unit area of land. On the other hand, fertilizer effects showed significance only in potassium content in stem and leaf and total NPK absorption from a unit land area. In terms of nitrogen, phosphorus and potassium accumulation in the plant tissues, two varieties stood out: Clark 63 and Improved Pelican at 5.06 percent and 4.98 percent, respectively. In total N, P, and K absorption from a unit land area, the same varieties, Clark 63 and Improved Pelican, were the highest ranking on account of their high dry matter production. In terms of bean yields, Clark 63 ranked highest and Improved Pelican, fourth. On the other hand, CES 16-38 ranked poorly in nutrient accumulation at only 4.40 percent in the plant tissues. However, it produced the highest total dry matter of plant tissues and, subsequently, ranked third in total NPK absorption. In terms of bean yields, CES 16-38 ranked second. Similarly, CES 65-39 ranked poorly in nutrient accumulation at 4.67 percent in the plant tissues, but ranked well (fifth) in total NPK absorption. In terms of yields, CES 65-39 ranked second.
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