Resumo

LOPEZ, Fernando Manuel et al. Factors determining phosphorus availability in soils under no tillage in southwest of Buenos Aires. Cienc. suelo [online]. 2019, vol.37, n.1, pp.158-163. ISSN 1850-2067.

The objective of this work was to analyze factors that would affect P availability for winter crops in soils under no tillage (SD) of the southwestern portion of Buenos Aires province -Argentina-. Extractable P, microbial activity and acid phosphatase activity presented a great stratification in all evaluated sites and years, which could affect P availability. Also, in 10-20 cm there were limitations in aeration porosity, which could affect the crop accessibility to soil P. These factors would explain the high response to phosphoric fertilization in soils under SD where P values were above sufficiency levels.

Palavras-chave : Extractable P; Stratification; Fertilization.