Soybean macronutrient availability and yield as affected by tillage system.

The effect of tillage system (NT-no tillage; CT-conventional tillage; MT-minimum tillage; and NT/scarification, every three years) on soybean nutrient availability and yield was evaluated on Oxisol after 12 years of cultivation. Soil samples were collected at depths of 0.00-0.05, 0.05-0.10, and 0.10-0.20 m and were analyzed for P, K, Ca, Mg, carbon (C), organic matter (OM), pH value, potential CEC, base saturation (BS%), and number of semiquinone organic radicals. The macronutrient concentration in the leaves and amount accumulated in the plants at the blooming stage were determined, as well as the yield of the two soybean crops. The soil pH value, BS% and K, Ca, and Mg concentrations were not influenced by the tillage system. The soil P and OM in the surface layer, however, were inversely proportional to the intensity of soil preparation. The P content in the soil surface layer under NT was twice as high as that of soil under CT. The P content in the soybean leaves under NT was also higher compared to that in the plants under CT and MT. The number of semiquinone radicals was low in the soil surface layer under NT, indicating a small degree of humification. However, soybean yield was not affected by the tillage system.

Bibliographic Details

Main Authors:	MOREIRA, S. G., KIEHL, J. de C., PROCHNOW, L. I., PAULETTI, V., MARTIN NETO, L., RESENDE, A. V. de
Other Authors:	Silvino Guimarães Moreira, Universidade Federal de Lavras; Jorge de Castro Kiehl, Escola Superior de Agricultura "Luiz de Queiroz"; Luís Ignácio Prochnow, International Plant Nutrition Institute; Volnei Pauletti, Universidade Federal do Paraná; LADISLAU MARTIN NETO, CNPDIA; ALVARO VILELA DE RESENDE, CNPMS.
Format:	Artigo de periódico biblioteca
Language:	English eng
Published:	2020-04-14
Subjects:	Plantio Direto, Sistema de Cultivo, Matéria Orgânica, Soja, Solo,
Online Access:	http://www.alice.cnptia.embrapa.br/alice/handle/doc/1121634
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