Title:	Exchangeable potassium reserve in a Brazilian savanna Oxisol after nine years under different cotton production systems.
Authors:	FERREIRA, A. C. de B. BORIN, A. L. D. C. LAMAS, F. M. FERREIRA, G. B. RESENDE, A. V. de
Affiliation:	ALEXANDRE CUNHA DE BARCELLOS FERREIRA; ANA LUIZA DIAS COELHO BORIN, CNPA; FERNANDO MENDES LAMAS, CPAO; GILVAN BARBOSA FERREIRA, CNPA; ALVARO VILELA DE RESENDE, CNPMS.
Date Issued:	2022
Citation:	Scientia Agricola, v.79, n.4, e20200339, 2022.
Description:	Adequate potassium (K) fertilization is essential for agricultural production in soils of the Brazilian Savanna (Cerrado biome) due to the high demand by crops (especially cotton), likelihood of leaching losses, and the dependence on fertilizer importations. Therefore, sustainability requires improvements in the soil efficiency management. This study evaluated the influence of soil management and crop succession or rotation combinations with cotton on K dynamics and exchangeable reserves in the soil profile, and the partial balance of K after nine years of cultivation in a clayey Oxisol in the Cerrado. The soil was sampled in layers up to 100 cm depth in four cotton production systems treatments: 1) conventional soil tillage (CST) with cotton monoculture; 2) CST with annual cotton-soybean-cotton succession; 3) CST with cotton/soybean/maize rotation; and 4) no-tillage system (NTS) with cotton/soybean/maize rotation and Urochloa ruziziensis (ruzigrass) as a cover crop in the off-season after grain crops. The experiment was conducted using a randomized block design with four replications. CST with cotton monoculture favored the leaching of K surplus from fertilization. Crop rotation including ruzigrass in the NTS allowed better control of K dynamics, ensuring its circulation in the soil-plant compartments and reducing leaching. The increased organic matter (OM) in this system enlarges the storage capacity of K in the topsoil. The adoption of no-tillage crop systems integrating ruzigrass is viable to improve the efficiency of K fertilizers in cotton cultivation in highly weathered tropical soils.
Thesagro:	Plantio Direto Fertilizante Potássico Capim Urochloa Gramínea Forrageira
NAL Thesaurus:	Urochloa ruziziensis No-tillage Long term experiments Potassium fertilizers
DOI:	http://doi.org/10.1590/1678-992X-2020-0339
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CNPMS)