Data/hora: 31/05/2024 10:15:04

Biblioteca(s): | Embrapa Agroindústria Tropical.
Data corrente: | 07/04/1994
Data da última atualização: | 07/04/1994
Autoria: | CASSMAN, K. G.; PLANT, R. E.
Título: | A model to predict crop response to applied fertilizer nutrients in heterogeneous fields.
Ano de publicação: | 1992
Fonte/Imprenta: | Fertilizer Research, v.31, p.151-163, 1992.
Idioma: | Inglês
Conteúdo: | In this paper we develop a model to quantify spatial variability in indigenous soil nutrient supply and assess the impact of this heterogencity on fertilizer use efficiency with uniform or site-specific nutrient application. Utilizing field data for wheat and rice response to applied N and cotton response to applied K, the model predicts that the magnitude of the difference in the nutrient input requirement of a heterogeneous field for site-specific versus uniform nutrient application depends on (1) a curvilinear crop response to nutrient supply and the mathematical form of the response function. (2) the degree and spatial distribution of the monuniformity in native soil-nutrient supply as quatified by its variance and skewness, (3) the targeted yield level,and (4) the effectiveness of fertilizer-nutrient addition, quantified by the slope of the relationship between the net increase in actual nutrient supply availableto to the slope of the relationship between the net increase in actual nutrient supply available to the crop and the quantity of applied nutrient.
Palavras-Chave: | Algodao - potassio - aplicacao; Arroz - nitrogeniio - aplicacao; Fertilizante - uso eficiente; Nitrogenio - uso eficiente; Solo - heterogeneidade; Variabilidade espacial.
Thesagro: | Potássio.
Categoria do assunto: | --
Registro original: | Embrapa Agroindústria Tropical (CNPAT)
Exemplares: | CNPAT - (982-1) - EMB - SP - -- - SP 01237 -  - 93.01237 - DIS