Publication Date
1989
Description
There are several factors which determine the low animal productivity in the tropics. Among these factors, inadequate nutrition is the most limiting one followed by the low natural fertility and high acidity of the soils in these regions. Previous findings have shown important soil nutrient deficiencies in some Brazilian cerrado soils. Malavolta (1952) demonstrated sulfur (S) deficiencies, while Werner et al. (1967) found plant response to S. Responses to phosphorus addition are very common in this kind of soil and in tropical America there are rates of phosphorus being applied, which sometimes are uneconomical for the formation and maintenance of pastures. The combination among tolerant varieties to the low phosphorus disponibility, the correct application of phosphatic fertilizers and the correction of the soil acidity, to reduce phosphorus fixation, would be an effective mean for its economical utilization in many tropical soils with high fixing capacity. In many cases, tropical grasses have shown little or no response to liming (Emrich, 1967). Being adapted to high acidity, they respond only to calcium and/or magnesium fertilization, when used at rates that are not enough to affect pH and the exchangeable aluminium (Ciat, 1977); however, there is a differential tolerance to soil acidity among forages, each species or variety in the same species having a different behavior. The purpose of this paper was to investigate possible deficiencies and responses of andropogon grass to rates of sulfur, phosphatic fertilization, and liming on "cerrado" soil.
Citation
Paulino, V T. and Malavolta, E, "Effects of Phosphogypsum, Phsophorus and Lime on Andropogon gayanus Kunth" (2025). IGC Proceedings (1989-2023). 18.
https://uknowledge.uky.edu/igc/1989/session1/18
Included in
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Effects of Phosphogypsum, Phsophorus and Lime on Andropogon gayanus Kunth
There are several factors which determine the low animal productivity in the tropics. Among these factors, inadequate nutrition is the most limiting one followed by the low natural fertility and high acidity of the soils in these regions. Previous findings have shown important soil nutrient deficiencies in some Brazilian cerrado soils. Malavolta (1952) demonstrated sulfur (S) deficiencies, while Werner et al. (1967) found plant response to S. Responses to phosphorus addition are very common in this kind of soil and in tropical America there are rates of phosphorus being applied, which sometimes are uneconomical for the formation and maintenance of pastures. The combination among tolerant varieties to the low phosphorus disponibility, the correct application of phosphatic fertilizers and the correction of the soil acidity, to reduce phosphorus fixation, would be an effective mean for its economical utilization in many tropical soils with high fixing capacity. In many cases, tropical grasses have shown little or no response to liming (Emrich, 1967). Being adapted to high acidity, they respond only to calcium and/or magnesium fertilization, when used at rates that are not enough to affect pH and the exchangeable aluminium (Ciat, 1977); however, there is a differential tolerance to soil acidity among forages, each species or variety in the same species having a different behavior. The purpose of this paper was to investigate possible deficiencies and responses of andropogon grass to rates of sulfur, phosphatic fertilization, and liming on "cerrado" soil.
