adubaçao potássica na produção de soja, nos teores de potássio nas folhas e na disponibilidade de potássio em latossolo roxo distrófico de cerrado effect of potassium fertilization, its availability in the cerrado soil, leaf concentration and yield of soybeans
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ID: 137649
1981
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Abstract
Foram estudadas no período 1973/78, em Latossolo roxo distrófico da Alta Mojiana (SP), as respostas de soja à aplicação de cinco níveis de adubação potássica, sendo o fertilizante aplicado apenas no primeiro ano. Em nenhuma localidade se observou efeito significativo do potássio na produção de sementes de soja nem nos teores desses elementos determinados nas folhas no período de florescimento das plantas em qualquer dos anos estudados. Em vista dessa não-resposta, foram determinados, em 1978, os teores de potássio trocável extraível com HNO3 IN a quente e do potássio total em amostras dos três latossolos. Pela análise mineralógica da fração grosseira, verificou-se a não-existência de minerais que possam apresentar reservas ponderáveis de potássio. Os baixos teores de potássio trocável e extraível pelo HNO3 a quente e as boas produções de soja obtidas nesses solos mostram que a soja tem grande poder de extração para o potássio do solo e que o nível de 0,12 meq/l00g, normalmente apresentado como limite inferior para a disponibilidade do potássio trocável do solo para o caso de soja, em solos de cerrado, e quando se utilizam cultivares de ciclo de 140 dias ou mais, pode ser provavelmente rebaixado para valores ao redor de 0,08 meq/100g de solo.
A study was carried out in the North of the State of São Paulo during a five year period (1973/78) in the cerrado soil at three localities to study yields of soybeans with the application of different levels of potassium. The potassium in the form of potassium chloride was applied in the rows at planting time only in the first year and in subsequent years only residual effect was studied. At the three localities no significant increase in yield of soybeans was observed nor were there differences in concentration of K in leaves in any of the years. Chemical analysis were made to determine exchangeable K, nonexchangeable K with could be released and total soil K. The soil mineralogical analysis showed the nonexistance of potassium reserves. Low exchangeable K and nonexchangeable K and good yields of soybeans indicated that soybeans have great capacity to extract potassium from the soil and the critical level usually established at 0.12 meq/100 g in the soil for soybean crop could probably be lowered to approximately 0.08 meq/100 g in cerrado soil for cultivars with 140 or more days maturity.
A study was carried out in the North of the State of São Paulo during a five year period (1973/78) in the cerrado soil at three localities to study yields of soybeans with the application of different levels of potassium. The potassium in the form of potassium chloride was applied in the rows at planting time only in the first year and in subsequent years only residual effect was studied. At the three localities no significant increase in yield of soybeans was observed nor were there differences in concentration of K in leaves in any of the years. Chemical analysis were made to determine exchangeable K, nonexchangeable K with could be released and total soil K. The soil mineralogical analysis showed the nonexistance of potassium reserves. Low exchangeable K and nonexchangeable K and good yields of soybeans indicated that soybeans have great capacity to extract potassium from the soil and the critical level usually established at 0.12 meq/100 g in the soil for soybean crop could probably be lowered to approximately 0.08 meq/100 g in cerrado soil for cultivars with 140 or more days maturity.
| Reference Key |
mascarenhas1981bragantiaadubaao
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| Authors | ;Hipólito A. A. Mascarenhas;J. M. A. da S. Valadares;C. L. Rotta;E. A. Bulisani |
| Journal | revista espanola de salud publica |
| Year | 1981 |
| DOI |
10.1590/S0006-87051981000100012
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