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Chilean Journal of Agricultural Research
Instituto de Investigaciones Agropecuarias, INIA
ISSN: 0718-5820
EISSN: 0718-5839
Vol. 74, No. 1, 2014, pp. 83-88
Bioline Code: cj14013
Full paper language: English
Document type: Research Article
Document available free of charge

Chilean Journal of Agricultural Research, Vol. 74, No. 1, 2014, pp. 83-88

 en Potassium nutrition in the first and second ratoon sugarcane grown in an Oxisol by a conservationist system
Alves Flores, Rilner; de Mello Prado, Renato; Pancelli, Márcio Alexandre; Almeida, Hilário Júnior; Rosatto Moda, Leandro; Borges, Bernardo Melo Montes Nogueira & de Souza Junior, Jonas Pereira

Abstract

The presence of mulch on the soil surface after the mechanical harvesting of sugarcane ( Saccharum officinarum check for this species in other resources L.) enhances the cycling of nutrients, especially K, which can decrease K fertilizer recommendations for the crop. The aim of this study was to evaluate the effect of K addition to an Oxisol, with an initial concentration 0.07 cmolc K kg-1, in first and second ratoon (no-till) sugarcane cultures by a conservationist system, i.e. rational use of fertilizers, use of alternative inputs and especially the maintenance of residues in soil that was previously burned to facilitate cutting. The following K doses were tested: 0, 32.5, 65, 130, and 195 kg ha-1, arranged in a randomized block design with five replicates. Potassium content in the soil and in the plant, as well as the yield and the quality of stalks were evaluated. Soil K application increased K concentration in soil and plant, and was reflected in the production of stems, with higher production (87.5 and 107.5 t ha-1) with the use of 120 and 123 kg K2O ha-1 in first and second ratoon sugarcane, respectively. At the first 2 yr it was not possible to reduce the K fertilization in ratoon. Therefore, with the introduction of the conservationist system there was an increase (20 t ha-1) at the second ratoon regarding the first one with the same applied rate

Keywords
Plant nutrition; residues covering; Saccharum officinarum

 
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