adubação do milho: iv - adubação azotada em cobertura fertilizer experiments with corn: iv - nitrogen application as top-dressing

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ID: 213418
1955
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Abstract
No presente trabalho são apresentados os resultados de quatro ensaios de adubação do milho, conduzidos de 1949/50 a 1952/53, na Estação Experimental Central, Campinas, com o fito de investigar-se o efeito da aplicação parcelada de azoto em diversas fases do desenvolvimento dessa planta. Em cada ano se utilizou uma área diferente, mas sempre de terra roxa misturada. Os adubos usados foram salitre do Chile, superfosfato e cloreto de potássio, na dose de 60 kg/ha de N, P2O5 e K2O. P e K foram aplicados nos sulcos de plantio. A dose de N foi empregada : a) tôda nos sulcos de plantio ; b) 2/3 nos sulcos de plantio e 1/3 em cobertura, por ocasião do desbaste ; c) 1/3 nos sulcos de plantio e 2/3 no desbaste ; d) 1/3 nos sulcos, 1/3 no desbaste e 1/3 no florescimento. Nas condições dos ensaios, quanto mais fracionada a dose total e menor a porção aplicada nos sulcos de plantio, tanto maior foi a resposta do milho ao azôto. Aparentemente, o parcelamento diminuiu a lixiviação do nitrato antes que o milho o pudesse absorver em escala apreciável, assim como, durante a germinação, os danos pelo excesso de concentração de sais.
Four experiments were carried out to study the effect of nitrogen applications to-corn at different stages of growth. These trials were planted in four consecutive years (1949 through 1952) at the Central Experiment Station, Campinas, in the "terra roxa misturada" type of soil, each experiment being set in a new location. Chilean nitrate, superphosphate, and potassium chloride were supplied to the plants at the rate of 60 kg per hectare of each, N, P2O2, and K2O. The phosphorus and potassium fertilizers were placed in the row at planting time. Nitrate of soda was applied as follows r a) all in the row at planting time ; b) 2/3 in the row and 1/3 as top-dressing at thinning time; c) 1/3 in the row and 2/3 when thinning ; d) 1/3 in the row, 1/3 when thinning, and 1/3 when tasseling started. The experiments indicated that the greater the number of times nitrogen was parceled out the better was the favorable response of the corn plants. These results are due to the lesser degree of injury caused to the germinating seed by the smaller amounts of salts placed in the row, and from the fact that parceling out the nitrogen made this easily-leachable nutrient available to the plants at times when they needed it most.
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Authors G. P. Viégas, R. A. Catani, E. S. Freire
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Journal revista espanola de salud publica
Year 1955
DOI
10.1590/S0006-87051955000100018
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051955000100018
Keywords
Agriculture (General)

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