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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PORTO, M.C.M.; EL-SHARKAWY, M.A.; COCK, J.H.; HERNANDEZ, A. DEL P.; CADENA, G. DE. 1987. Crescimento, fotossintese e eficiencia do uso de nitrogenio em milho, feijao e mandioca submetidos a dois niveis de N no solo. Revista Brasileira de Mandioca. 6(1):35-47.
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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)
MANIHOT ESCULENTA; SOIL FERTILITY; NUTRIENT UPTAKE; LEAVES; LEAF AREA; DRY MATTER; PHOTOSYNTHESIS; COMPOSITION; CULTIVATION; PLANT ANATOMY; PLANT PHYSIOLOGICAL PROCESSES; PLANT PHYSIOLOGY; SOIL REQUIREMENTS; STARCH CROPS; MANIHOT ESCULENTA; FERTILIDAD DEL SUELO; ABSORCION DE NUTRIMENTOS; HOJAS; AREA FOLIAR; MATERIA SECA; FOTOSINTESIS