Maize dry matter production and macronutrient extraction model as a new approach for fertilizer rate estimation
Document title: Maize dry matter production and macronutrient extraction model as a new approach for fertilizer rate estimation
Journal: Anais da Academia Brasileira de Ciencias
Database: PERIÓDICA
System number: 000409016
ISSN: 0001-3765
Authors: 1
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2
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Institutions: 1Universidade de Sao Paulo, Escola Superior de Agricultura "Luiz de Queiroz", Piracicaba, Sao Paulo. Brasil
2Universidade de Sao Paulo, Centro de Energia Nuclear na Agricultura, Piracicaba, Sao Paulo. Brasil
Year:
Season: May
Volumen: 89
Pages: 705-716
Country: Brasil
Language: Inglés
Document type: Nota breve o noticia
Approach: Analítico, descriptivo
English abstract Decision support for nutrient application remains an enigma if based on soil nutrient analysis. If the crop could be used as an auxiliary indicator, the plant nutrient status during different growth stages could complement the soil test, improving the fertilizer recommendation. Nutrient absorption and partitioning in the plant are here studied and described with mathematical models. The objective of this study considers the temporal variation of the nutrient uptake rate, which should define crop needs as compared to the critical content in soil solution. A uniform maize crop was grown to observe dry matter accumulation and nutrient content in the plant. The dry matter accumulation followed a sigmoidal model and the macronutrient content a power model. The maximum nutrient absorption occurred at the R 4 growth stage, for which the sap concentration was successfully calculated. It is hoped that this new approach of evaluating nutrient sap concentration will help to develop more rational ways to estimate crop fertilizer needs. This new approach has great potential for on-the-go crop sensor-based nutrient application methods and its sensitivity to soil tillage and management systems need to be examined in following studies. If mathematical model reflects management impact adequately, resources for experiments can be saved
Disciplines: Agrociencias
Keyword: Fertilización,
Fitotecnia,
Suelos,
Maíz,
Estimación,
Tasa de fertilización,
Valor nutritivo
Keyword: Agricultural sciences,
Crop husbandry,
Fertilization,
Soils,
Maize,
Estimation,
Fertilization rate,
Nutritive value
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