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BIBTEX RIS

Organic acid coated-slow-release phosphorus fertilizers improve P availability and maize growth in a tropical soil

2016; Springer Science+Business Media; Issue: ahead Linguagem: Inglês

10.4067/s0718-95162016005000081

ISSN

0718-9516

Autores

Rafael da Silva Teixeira, Ivo Ribeiro da Silva, Rodrigo Nogueira de Sousa, Edson Márcio Mattiello, Emanuelle Mercês Barros Soares,

Tópico(s)

Crop Yield and Soil Fertility

Resumo

In this paper, we report the results of studies on the solubility (water solubility trial) and the response by plants (greenhouse pot experiment using Zea mays) for four types of monoammonium phosphate fertilizers (Conventional MAP -MAP 1 , MAP coated with a natural organic acid -MAP 2 , MAP coated with a synthetic organic acid -MAP 3 , and MAP coated with a peat humic organic acid -MAP 4 ) applied at five increasing doses (0, 100, 300, 600 and 1200 mg P dm -3 ) and pre-incubated with the soil for five lengths of time before planting (0, 15, 30 and 60 d).The coating with organic acids reduced the water solubility of the P fertilizers -MAP 4 provided a more gradual release of P over time.In the soil pot experiment, it was found that MAP 1 required the highest dose to reach 90% of dry matter accumulation by the maize plant, followed by the Coated-Slow-Release Fertilizers (CSRF).The agronomic efficiency (AE) of P applied as the CSRF was 3 to 13% greater than that of MAP 1 .In addition, MAP 4 led to higher values of AE (+11%) and apparent P recovery by maize (+41%) in comparison to MAP 1 .The physicochemical properties imposed by the chemical composition of the organic acid coatings generated fertilizers with distinct release rates and improved agronomic efficiencies.

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