Efeito da calagem e sulfato de amônio no algodão. I - Transporte de cátions e ânions no solo
Contribuinte(s) |
Universidade Estadual Paulista (UNESP) |
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Data(s) |
27/05/2014
27/05/2014
01/05/2006
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Resumo |
Applying lime on the soil surface in soils managed under no-tillage has caused an excess of basic cations in the most superficial layers of the soil profile. On the other hand, subsoil acidity is considered a constraint to the development of deep plant roots. The objective of this study was to evaluate Ca 2+, Mg 2+, NO 3- and SO 4 2- leaching in the soil profile as affected by liming and top dressing nitrogen fertilization in cotton, grown with straw cover on the soil surface. Cotton plants (Gossypium hirsutum) were grown for 60 days in PVC columns filled with a Distroferric Red Latosol (sand loam Rhodic Oxisol) with liming applied over the straw on the soil surface, incorporated liming 0-20 cm deep, or without liming. Nitrogen was applied at rates of 0, 50, 100 and 150 kg ha -1 as ammonium sulfate. The PVC columns were set up in layers of 0-5, 5-10, 10-20, 20-30 and 30-30 cm, totaling 15.71 dm 3. The ammonium sulfate application caused intense leaching of SO 4 2- in the soil, irrespective of the lime application method. Liming increased the concentration of NO 3 in the 0-20 cm soil layer, whereas the correction of the soil acidity did not affect the NO 3- concentration in the 30-50 cm soil layer. The influence of ammonium sulfate on Ca 2+ leaching below 20 cm was only observed in the soil with incorporated lime. Nitrogen application resulted in extensive Mg 2+ leaching from the soil, regardless of the lime application method. In the soil layer below 30 cm, SO 4 2- presented a higher correlation than NO 3- in the formation of ionic pairs with Ca 2+ and Mg 2+. |
Formato |
425-432 |
Identificador |
http://dx.doi.org/10.1590/S0100-06832006000300004 Revista Brasileira de Ciencia do Solo, v. 30, n. 3, p. 425-432, 2006. 0100-0683 1806-9657 http://hdl.handle.net/11449/68869 10.1590/S0100-06832006000300004 S0100-06832006000300004 WOS:000239083100004 2-s2.0-33749165594 2-s2.0-33749165594.pdf |
Idioma(s) |
por |
Relação |
Revista Brasileira de Ciência do Solo |
Direitos |
openAccess |
Palavras-Chave | #Calcium #Magnesium #Nitrate #No-tillage #Potassium #Gossypium hirsutum |
Tipo |
info:eu-repo/semantics/article |