Data/hora: 21/06/2024 00:25:14

Biblioteca(s): | Embrapa Pantanal.
Data corrente: | 12/07/1996
Data da última atualização: | 15/05/2009
Autoria: | DANTZMAN, C. L.; BLUE, W. G.
Título: | Recovery of phosphorus and potassium by Pangola digitgrass on a Myakka fine sand as affected by time of application.
Ano de publicação: | 1977
Fonte/Imprenta: | Proceedings Soil and Crop Science Society of Florida, v.36, p.51-54, 1977.
Idioma: | Inglês
Conteúdo: | A 4-year trial was conducted to determine the amounts of P and K, normally applied in the fall for a cool-season legume, that could be recovered by a companion warm-season grass during the following summer. Cool season legumes, especially white clover (Trifolium repens L.) in mixture with a warm-season grass, are normally fertilized with P and K during the fall or winter; these nutrient are also used by the warm-season grass through recycling by cattle. In seasons with insuficient moisture for legume growth. P-K absorption would be low during the cool season which could permit nutrient leaching. In this experiment, P and K were applied once per year to 'Pangola' digitgrass (Digitaria decumbens Stent.), on four different treatment dates which were October 15, December 10, February 1 and April 1, and in a split application on April 1 and July 1. Phosphorus and k were applied at the rates of 24.4 and 93 kg/ha per year, respectively. Nitrogen was applied at the rate of 224 kg/ha year divided evenly between March 15 and July 1. Adequate amounts of lime and mkicronutrients were added. Soil was sampled each spring, extracted with N NH4OAc (pH 4.8), and analyzed for P and K. Grass was harvested four times per year (June, July, September and October), weighed, ground, and analyzed for P and K. No significant difference in yields due to date of P and K application was found. The data indicated little different in P or K concentrations in the forage caused by time of fertilization. Average recovery efficiency of applied P ranged from 47 to 61% and of applied K from 55 to 69% and was not affected by dates of fertilization. This suggests that P and K applied for forage production anytime from October to April will be used with the same efficiency by the grass during the following warm season.
Palavras-Chave: | Analise de solo; Fertilizacao; Nutrient recycling; Phosphorus and potassium fertilization.
Thesagro: | Digitaria Decumbens; Fósforo; Nutriente; Potássio.
Thesaurus Nal: | soil analysis.
Categoria do assunto: | --
Registro original: | Embrapa Pantanal (CPAP)
Exemplares: | CPAP - (32675-1) - ADC - SP - -- - SP3044 -  - 3044 - DIS