LIME AND GYPSUM AS PHYSICAL AND CHEMICAL CONDITIONERS OF A SAVANNAH SOIL UNDER THREE MANAGEMENT SYSTEMS
Keywords:
Soil management, liming, gypsumAbstract
Samples of a savannah dystroferric Oxisol were collected from three management systems, incubated with lime to 0%, 60% and 100% base saturation, and with agricultural gypsum to 0 kg ha-1, 500 kg ha-1, 1,000 kg ha-1 and 2,000 kg ha-1. A completely randomized 3x3x4 factorial experimental design was used, with four replications. After lime and gypsum application, soil samples were incubated for 45 days. Afterwards, physical and chemical analyses were performed. Independently of the soil management system, a close inverse correlation (r = -0.9801; p < 0,01) between water dispersed clay content (WDC) and flocculation degree was observed. In soil samples collected from annual crops without liming WDC values were higher than for forage and native savannah vegetation. Soil liming for forage, at 60% base saturation, promoted increase in aggregates greater than 1.0 mm. Gypsum increased flocculation, no matter rates or soil use.
KEY-WORDS: Soil management; liming; gypsum.
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