Agronomic Effectiveness of Acidulated Phosphate Fertilizers with Different Water Solubility

There is a high demand of P fertilizers in Brazilian agriculture, where the most common sources in use are acidulated phosphates. Due to the high P fixation capacity and low P levels of Brazilian soils in general, soluble P fertilizers have always been preferred for their high agronomic effectiveness. Recently, Brazilian legislation allowed the use of P fertilizers with low water solubility, but field trials are still needed to evaluate the effectiveness of such products. This project aims to study the agronomic effectiveness of four P fertilizers (acidulated phosphates) varying in water solubility (85, 70, 60, and 50%) for soybeans in an Oxisol in the Cerrado of Brazil. Results from the first year of this study suggest the same agronomic effectiveness for P fertilizers with water solubility higher than 60%, but lower effectiveness for the source with 50% water solubility. Therefore, the use of acidulated phosphates with lower water solubility (50%), compared to the currently used source with 85% water solubility, may be an alternative for Brazilian agriculture. This is a three-year project, and valuable and more conclusive results will be possible with time. Brazil-59

IPNI-2011-BRA-59

Acidulated P fertilizers are the main sources of P in Brazilian agriculture where there is a high demand for the nutrient especially in the Cerrado. Recently, Brazilian legislation allowed the use of low water solubility P fertilizers in agriculture but agronomic studies are still needed to evaluate news products. Read more


Year of initiation:2011
Year of completion:2014
Map:

Interpretive Summary

There is high demand for P fertilizers in Brazilian agriculture. The most common sources in use are acidulated phosphates. Due to the high P fixation capacity and low P levels of Brazilian soils, soluble P fertilizers have always been preferred for their high agronomic effectiveness. Recently, Brazilian legislation allowed the use of P fertilizers with low water solubility, but field trials are still needed to evaluate the effectiveness of such products.

There is a high demand for P fertilizers in Brazilian agriculture, where the most common sources are acidulated phosphates. Due to the high P fixation capacity and low P concentration of Brazilian soils in general, soluble P fertilizers have always been preferred for their high agronomic effectiveness. Recently, Brazilian legislation allowed the use of P fertilizers with low water solubility, but field trials are still needed to evaluate the effectiveness of such products.

There is a high demand of P fertilizers in Brazilian agriculture, where the most common sources in use are acidulated phosphates. Due to the high P fixation capacity and low P levels of Brazilian soils in general, soluble P fertilizers have always been preferred for their high agronomic effectiveness. Recently, Brazilian legislation allowed the use of P fertilizers with low water solubility, but field trials are still needed to evaluate the effectiveness of such products.

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Updates & Reports

2013

2013 Annual Report

2014

Abstract presented at the Soil Science Brazilian Congress 2013

2012

2012 Annual Report

2013

Project Description


Project Leader

Eros Francisco, International Plant Nutrition Institute (IPNI)


Project Cooperators

Dr. Takashi Muraoka
Dr. Claudinei Kappes


IPNI Staff

E. Francisco


Location

Americas \ South America \ BRA \ Mato Grosso


Topics

4r source, soil fertility and productivity

soybean

Phosphorus (P)