Crescimento, fotossintese e eficiencia do uso de nitrogenio em milho, feijao e mandioca submetidos a dois niveis de N no solo
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Growth and N uptake in pot-grown maize, beans, and cassava were evaluated under 2 levels of soil N at CIAT-Palmira (Colombia). The lower amount of the element reduced its uptake by the 3 species, resulting in lower tissue concn., especially in the leaves. Under low N, DM accumulation was also reduced 5 wk. after planting for maize and beans, and 7 wk. after planting for cassava. Higher amounts of N in the soil increased leaf expansion and photosynthesis (Pn) in maize and beans 3 and 4 wk. after planting, resp., and in cassava after 7 wk. Cassava plants tended to increase N-use efficiency, slightly but nonsignificantly, under low N. Maize used N more efficiently; however, the existence of a real difference between crops cannot be affirmed due to the reduced soil N concn. (AS)
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manihot esculenta, soil fertility, nutrient uptake, leaves, leaf area, dry matter, photosynthesis, composition, cultivation, plant anatomy, plant physiological process, plant physiology, soil requirements, starch crops, fertilidad del suelo, absorcion de nutrimentos, hojas, area foliar, materia seca, fotosintesis