Crescimento radicular de soja em razão da sucessão de cultivos e da compactação do solo
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Data
2002-06-01
Autores
Silva, Rosemeire Helena da [UNESP]
Rosolem, Ciro Antonio [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA)
Resumo
O objetivo do experimento foi avaliar o crescimento radicular e produção de matéria seca da parte aérea da soja (Glycine max (L.) Merrill) cultivada após diversas espécies vegetais, em solo com diferentes níveis de compactação. O trabalho foi realizado em vasos contendo amostras de um Latossolo Vermelho, textura franco arenosa, com camada de 3,5 cm (profundidade de 15 a 18,5 cm) compactada até as densidades 1,12, 1,36 e 1,60 Mg m-3, onde cultivaram-se anteriormente aveia-preta, guandu, milheto, mucuna-preta, soja, sorgo granífero e tremoço-azul, e um tratamento sem planta (pousio). Essas espécies se desenvolveram por 37 a 39 dias, foram cortadas ao nível do solo, picadas em partes de aproximadamente 3 cm e deixadas sobre a superfície do vaso por 40 dias. Após esse período, cultivou-se a soja até 28 dias após a emergência, quando, então, as plantas foram colhidas. Foram avaliados produção de matéria seca da parte aérea e de raízes, e comprimento e diâmetro radicular da soja. O cultivo anterior com aveia-preta, guandu e milheto favoreceu o crescimento radicular da soja abaixo de camadas compactadas do solo. Independentemente do nível de compactação, o cultivo anterior com qualquer das espécies estudadas beneficiou a produção de matéria seca da parte aérea da soja.
This study aimed at evaluating root growth and shoot dry matter production of soybean (Glycine max (L.) Merrill) cropped after different vegetal species, in a soil with different compaction levels. The experiment was conducted in pots containing a Dark-Red Latosol (Acrortox, loamy sand), and the pots had a layer 3.5 cm (15 to 18.5 cm) thick and 15 cm deep compacted to 1.12, 1.36 and 1.60 Mg m-3. Before soybean, the pots were cropped with black oat, pigeon pea, pearl millet, black mucuna, soybean, grain sorghum and lupin, plus a treatment without plants. These species were grown for 37 to 39 days, when they were cut at soil level, prick in particles of approximately 3 cm length, and left on the soil surface for 40 days. After this, soybean was planted in the pots and was allowed to grow for 28 days after plant emergence. The soybean shoot dry matter weight, root length, diameter and dry matter were evaluated. The previous crop with black oat, pigeon pea and pearl millet favored the soybean root growth below compacted layer soil. Regardless soil compaction, the soybean shoot dry matter was favored by the previous crop.
This study aimed at evaluating root growth and shoot dry matter production of soybean (Glycine max (L.) Merrill) cropped after different vegetal species, in a soil with different compaction levels. The experiment was conducted in pots containing a Dark-Red Latosol (Acrortox, loamy sand), and the pots had a layer 3.5 cm (15 to 18.5 cm) thick and 15 cm deep compacted to 1.12, 1.36 and 1.60 Mg m-3. Before soybean, the pots were cropped with black oat, pigeon pea, pearl millet, black mucuna, soybean, grain sorghum and lupin, plus a treatment without plants. These species were grown for 37 to 39 days, when they were cut at soil level, prick in particles of approximately 3 cm length, and left on the soil surface for 40 days. After this, soybean was planted in the pots and was allowed to grow for 28 days after plant emergence. The soybean shoot dry matter weight, root length, diameter and dry matter were evaluated. The previous crop with black oat, pigeon pea and pearl millet favored the soybean root growth below compacted layer soil. Regardless soil compaction, the soybean shoot dry matter was favored by the previous crop.
Descrição
Palavras-chave
Glycine max, rotação de culturas, matéria seca, densidade do solo, Glycine max, crop rotation, dry matter, soil density
Como citar
Pesquisa Agropecuária Brasileira. Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA) Informação TecnológicaPesquisa Agropecuária Brasileira, v. 37, n. 6, p. 855-860, 2002.