Manejo da adubação nitrogenada paraa batata-doce: fontes e parcelamento de aplicação
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Data
2009-12-01
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Editor
Editora da Universidade Federal de Lavras (UFLA)
Resumo
Com o objetivo de avaliar o rendimento da batata-doce [Ipomoea batatas (L.) Lam.], cultivar Rainha Branca, submetida a fontes e parcelamentos da aplicação de 80 kg ha-1 de nitrogênio, instalou-se um experimento, no período de abril a agosto de 2007, na Universidade Federal da Paraíba, em Areia. O delineamento experimental utilizado foi o de blocos casualizados, em esquema fatorial 2 x 7, com duas fontes de nitrogênio (uréia e sulfato de amônio) e oito de épocas parcelamentos da aplicação (100% no plantio; 100% aos 30 dias após o plantio (DAP); 100% aos 60 DAP; 50% no plantio e 50% aos 30 DAP; 50% no plantio e 50% aos 60 DAP; 50% aos 30 e 50% aos 60 DAP; 33% no plantio, 33% aos 30 e 33% aos 60 DAP), com quatro repetições. Foram avaliados o peso médio de raízes comerciais, a produção e o número de raízes comerciais por planta e as produtividades total e comercial de raízes de batatadoce. O maior peso médio de raízes comerciais (294 g) foi obtido com o parcelamento do N, como uréia, 50% no plantio e 50% aos 30 DAP. O parcelamento de N 33% no plantio, 33% aos 30 DAP e 33% aos 60 DAP na forma sulfato de amônio foi responsável pela maior produção de raízes comerciais por planta (337 g). Para o número de raízes comercias e as produtividades total e comercial, o N na forma de sulfato de amônio parcelado 33% no plantio, 33% aos 30 DAP e 33% aos 60 DAP proporcionou os maiores valores, 1,50 raízes, 30,5 e 28,4 t ha-1, respectivamente.
For the purpose of evaluating the yield of the sweet potato [Ipomoea batatas (L.) Lam.], variety Rainha Branca, subjected to sources and parceling of nitrogen, an experiment was carried out in soil classified as typical Inceptisol Regolítico Psamítico at the Universidade Federal da Paraíba, Areia county, from April to August 2007. The experimental design used was one of randomized blocks, with a factorial scheme of 2 x 7, using two sources of nitrogen fertilizer (urea and ammonium sulfate) and eight application times (100% at planting; 100% at 30 days after planting (DAP); 100% at 60 DAP; 50% at planting and 50% at 30 DAP; 50% at planting and 50% at 60 DAP; 50% at 30 and 50% at 60 DAP; and 33% at planting, 33% at 30 and 33% at 60 DAP), with four replicates. The following variables were evaluated: average weight of the commercial roots plan t-1, the total, commercial, and noncommercial productivities of sweet potato roots. The highest average weight of the commercial roots was obtained with urea in parceling 50% at planting and 50% at 30 DAP, (293.75 g).. Parceling 33% at planting, 33% at 30, and 33% at 60 DAP were responsible for the highest yield of commercial roots per plant. The lowest yield of commercial roots per plant was obtained in the same source with parceling 50% at 30 and 50% at 60 DAP (26.48 g). For the number of commercial roots, total and commercial productivities, ammonium sulfate parceled 33% at planting, 33% at 30, and 33% at 60 DAP provided the highest values (1.50 roots, 30. and 28.4 t ha-1, respectively.
For the purpose of evaluating the yield of the sweet potato [Ipomoea batatas (L.) Lam.], variety Rainha Branca, subjected to sources and parceling of nitrogen, an experiment was carried out in soil classified as typical Inceptisol Regolítico Psamítico at the Universidade Federal da Paraíba, Areia county, from April to August 2007. The experimental design used was one of randomized blocks, with a factorial scheme of 2 x 7, using two sources of nitrogen fertilizer (urea and ammonium sulfate) and eight application times (100% at planting; 100% at 30 days after planting (DAP); 100% at 60 DAP; 50% at planting and 50% at 30 DAP; 50% at planting and 50% at 60 DAP; 50% at 30 and 50% at 60 DAP; and 33% at planting, 33% at 30 and 33% at 60 DAP), with four replicates. The following variables were evaluated: average weight of the commercial roots plan t-1, the total, commercial, and noncommercial productivities of sweet potato roots. The highest average weight of the commercial roots was obtained with urea in parceling 50% at planting and 50% at 30 DAP, (293.75 g).. Parceling 33% at planting, 33% at 30, and 33% at 60 DAP were responsible for the highest yield of commercial roots per plant. The lowest yield of commercial roots per plant was obtained in the same source with parceling 50% at 30 and 50% at 60 DAP (26.48 g). For the number of commercial roots, total and commercial productivities, ammonium sulfate parceled 33% at planting, 33% at 30, and 33% at 60 DAP provided the highest values (1.50 roots, 30. and 28.4 t ha-1, respectively.
Descrição
Palavras-chave
Ipomoea potatoes, Urea, ammonium sulfate, Yield, Ipomoea batatas, sulfato de amônio, Uréia, época de aplicação, Rendimento
Como citar
Ciência e Agrotecnologia. Editora da Universidade Federal de Lavras (UFLA), v. 33, n. 6, p. 1554-1559, 2009.