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Isotopic (32P), biochemical and physiological assessments for agronomic evaluation of granulated organomineral fertilizers by corn and soybean

Grant number: 13/22173-4
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): May 01, 2014
Effective date (End): September 30, 2017
Field of knowledge:Agronomical Sciences - Agronomy - Soil Science
Principal Investigator:José Lavres Junior
Grantee:Joaquim José Frazão
Home Institution: Centro de Energia Nuclear na Agricultura (CENA). Universidade de São Paulo (USP). Piracicaba , SP, Brazil


The tropical soils have low phosphorus (P) available to plants and high P-adsorption capacity for oxides of Fe and Al. Besides, the mineral reserves of P are finite. Therefore, it is necessary to develop fertilizer with high agronomic efficiency. In this context, the present study aims to evaluate the agronomic efficiency of granulated organomineral fertilizer (OMF) based on poultry litter (PL) and soluble sources of P. Two experiments will be carried out: - one in the greenhouse, using the isotopic method (32P) and biochemical assay (acid phosphatase), and the second one will be held in field conditions, with corn and soybeans. In the first experiment, we will use the randomized design in a factorial 2x4+1 (two P sources, four P rates and the check). The following P-sources are: 1-Triple superphosphate (TSP) 2-OMF based on PL and TSP, tested at P rates of 125, 250, 500 and 1000 mg of P2O5 ¬per pot. It will be assessed plant top dry matter yield (also roots and grains), nutrients accumulation, the specific activity of 32P and phosphatase activity in the soil (rhizosphere) and in the plant tissue, as well. Based on the all results it will be calculated agronomic efficiency. For the field experiment, it will be used a randomized block design in a factorial scheme 2x4+1 (two P sources, four rates and check). The following sources are: 1-OMF (based on PL and simple superphosphate or MAP), and 2-Fertilizer 08-28-20 (corn) or 00-30-20 (soybean). The P-rates will be 100, 200, 400 and 800 kg/ha in maize, whereas for soybeans it will be tested P doses of 80, 160, 320 and 640 kg/ha. Right after, it will evaluated the plant height, stem diameter, SPAD index, plant top dry weight, P plant (tissue) concentration and soil-P analysis and plant yields. Based on the results of the two experimental groups, by using methods isotopic, chemical, biochemical and physiological it will be supposed to obtain relevant information on the agronomic efficiency of OMFs, contributing to a better utilization of the PL and reducing extern dependence of fertilizers.

Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
FRAZAO, JOAQUIM JOSE; BENITES, VINICIUS DE MELO; SCHIAVON RIBEIRO, JOAO VICTOR; PIEROBON, VITOR MATEUS; LAVRES, JOSE. Agronomic effectiveness of a granular poultry litter-derived organomineral phosphate fertilizer in tropical soils: Soil phosphorus fractionation and plant responses. Geoderma, v. 337, p. 582-593, MAR 1 2019. Web of Science Citations: 0.
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
FRAZÃO, Joaquim José. Agronomic effectiveness of a poultry litter-derived organomineral phosphate fertilizer in maize and soybean. 2017. Doctoral Thesis - Universidade de São Paulo (USP). Centro de Energia Nuclear na Agricultura Piracicaba.

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