Phosphorus doses and irrigation on nutrition of coffee leaf/Doses de fosforo e irrigacao na nutricao foliar do cafeeiro

The objective of this study was to evaluate the effect of increasing phosphorus doses and different irrigation depths on a phosphorus content of leaf of coffee plants at the stage of first harvest. Coffee (Topazio MG-1190) orchard was planted in January 2010. The treatments were imposed after Novemb...

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Veröffentlicht in:Revista brasileira de engenharia agrícola e ambiental 2014-12, Vol.18 (12), p.1235
Hauptverfasser: Dominghetti, Anderson W, Scalco, Myriane S, Guimaraes, Rubens J, Silva, Douglas R.G, Carvalho, Joao P.S, Pereira, Vinicius A
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Zusammenfassung:The objective of this study was to evaluate the effect of increasing phosphorus doses and different irrigation depths on a phosphorus content of leaf of coffee plants at the stage of first harvest. Coffee (Topazio MG-1190) orchard was planted in January 2010. The treatments were imposed after November 2011. An experimental design with randomized blocks arranged in a 5 x 4 factorial scheme with three replications was used. Treatments consisted of five irrigation depths, that corresponded to fractions (0.4; 0.7; 1.0; 1.3 and 1.6) of the depth based on the crop coefficient, and four phosphorus doses (0, 80, 240 and 720 kg [ha.sup.-1]). A drip irrigation system was used. The phosphate fertilizer used was monoammonium phosphate that was applied via fertigation in twelve equal split applications. Leaf phosphorus content was determined at the interval of two, four, six, eight, ten, and twelve months after the application of treatments. For both single application of phosphorus at planting, as in the application of increasing doses, applied by fertigation, it was observed that, in the first year of coffee harvest, leaf content of phosphorus in coffee plants increases with increasing water depth. Key words: Coffea arabica L. phosphorus fertilizer application fertigation O objetivo deste trabalho foi avaliar, em doses crescentes de fosforo, o efeito de laminas de irrigacao no teor foliar de fosforo de cafeeiros em estagio de primeiro ano de producao. O plantio (Topazio MG-1190) foi realizado em janeiro de 2010 e os tratamentos diferenciados a partir de novembro de 2011. Utilizou-se o delineamento experimental em blocos ao acaso com tres repeticoes, com tratamentos dispostos no esquema fatorial 5 x 4 os quais se compunham por cinco laminas de irrigacao correspondentes as fracoes (0,4; 0,7; 1,0; 1,3 e 1,6) da lamina calculada pelo coeficiente de cultura e quatro doses de fosforo (0, 80, 240 e 720 kg [ha.sup.-1]). Foi utilizado o sistema de irrigacao por gotejamento enquanto a adubacao fosfatada (monoamonio fosfato purificado) foi feita via fertirrigacao, em doze parcelamentos iguais durante o ano. Foram avaliados os teores foliares de fosforo aos dois, quatro, seis, oito, dez e doze meses apos o inicio dos tratamentos. Tanto em aplicacao unica de fosforo, no plantio, quanto na aplicacao de doses crescentes parceladas via fertirrigacao, observou-se que no primeiro ano de producao o teor foliar de fosforo de cafeeiros aumenta com aumento da lamina de irrigacao. Palavras
ISSN:1415-4366
DOI:10.1590/1807-1929/agriambi.v18n12p1235-1240