Abstract
Balanced fertilizations with N and K often increase the performance of crops, however, when there is absence of one of these nutrients in poor soils, can reduce crop response to fertilization with the other. The objective of this work was to evaluate the productivity of sweet-potato, the amount of sweetpotato without quality, and leaf nutrients analysis, of sweet-potato crop fertilized with N and K. The trial was conducted in farming for commercial production, in Presidente Prudente, São Paulo State, during February-June 2007, in a dystrophic Ultisol of medium texture. The experimental design was a randomized complete block design, with four replications, on factorial 4 x 4: levels of 0, 30, 60 and 120 kg N ha-1 (urea source) combined with levels of 0, 30, 60 and 120 kg K2O ha-1 (KCl source), applied to 39 days after planting of the crop. The sweet-potato is responsive to topdressing application with nitrogen and potassium, however, the greatest increases in productivity occur when doses of N and K are combined. Fertilization with N and K not increase the amount of sweet-potato without quality marketing. The highest increase in productivity of sweet-potato is reached with topdressing combined with 100 kg N ha-1 plus 120 kg K2O ha-1. A adubação balanceada de N e K frequentemente aumenta o desempenho das lavouras, contudo, a falta de um desses nutrientes em solos deficientes pode levar a decréscimos na resposta ao outro. O objetivo deste trabalho foi avaliar a produtividade de batata-doce comercializável, a quantidade de raízes tuberosas para descarte e a diagnose foliar de lavoura de batata-doce adubada com N e K. O experimento foi realizado em lavoura comercial, em Presidente Prudente-SP, de fevereiro a junho de 2007, em um Argissolo Vermelho distroférrico de textura média. O delineamento experimental foi em blocos completos casualizados, com quatro repetições, no esquema fatorial 4 x 4, com 0, 30, 60 e 120 kg ha-1 de N (uréia), em interação com 0, 30, 60 e 120 kg ha-1 de K2O (KCl), aplicados em cobertura aos 39 dias após o plantio. A cultura da batata-doce é responsiva à adubação nitrogenada e potássica de cobertura, porém, os maiores incrementos de produtividade são alcançados com as doses de N e K combinadas. A adubação de cobertura com N e K não acarreta em aumento da quantidade de raízes tuberosas impróprias para a comercialização. O maior incremento de produtividade da batata-doce é alcançado com a adubação de cobertura combinada com 100 kg de N ha-1 mais 120 kg de K2O ha-1.
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Claims 4
Claim · model-written summary
Sweet-potato productivity responded to topdressing with nitrogen and potassium.
- Taxon
- sweet-potato
_Flower.jpg?width=60)
Ipomoea batatase0 - Treatment
- topdressing application with nitrogen and potassiume0
- Outcome
- productivitye1
- Direction
- increaseinferrede0
- Setting
- Presidente Prudente, São Paulo Statee4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Flower.jpg?width=500)
Verbatim
e0“The sweet-potato is responsive to topdressing application with nitrogen and potassium”
e1“the greatest increases in productivity occur when doses of N and K are combined”
e4“The trial was conducted in farming for commercial production, in Presidente Prudente, São Paulo State, during February-June 2007”
Claim · model-written summary
The greatest increases in sweet-potato productivity occurred when N and K doses were combined.
- Taxon
- sweet-potatoIpomoea batatase0
- Treatment
- doses of N and K are combinede1
- Outcome
- productivitye1
- Direction
- increasese1
- Setting
- Presidente Prudente, São Paulo Statee4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The sweet-potato is responsive to topdressing application with nitrogen and potassium”
e1“the greatest increases in productivity occur when doses of N and K are combined”
e4“The trial was conducted in farming for commercial production, in Presidente Prudente, São Paulo State, during February-June 2007”
Claim · model-written summary
Topdressing with N and K did not increase the amount of sweet-potato without quality marketing.
- Taxon
- sweet-potatoIpomoea batatase2
- Treatment
- Fertilization with N and Ke2
- Outcome
- amount of sweet-potato without quality marketinge2
- Direction
- not increasee2
- Setting
- Presidente Prudente, São Paulo Statee4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Fertilization with N and K not increase the amount of sweet-potato without quality marketing”
e4“The trial was conducted in farming for commercial production, in Presidente Prudente, São Paulo State, during February-June 2007”
Claim · model-written summary
The highest sweet-potato productivity increase was reached with topdressing of 100 kg N ha-1 plus 120 kg K2O ha-1.
- Taxon
- sweet-potatoIpomoea batatase3
- Treatment
- topdressing combined with 100 kg N ha-1 plus 120 kg K2O ha-1e3
- Outcome
- productivitye3
- Direction
- increasee3
- Setting
- Presidente Prudente, São Paulo Statee4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“The highest increase in productivity of sweet-potato is reached with topdressing combined with 100 kg N ha-1 plus 120 kg K2O ha-1”
e4“The trial was conducted in farming for commercial production, in Presidente Prudente, São Paulo State, during February-June 2007”
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