Status of inorganic 'P' fractions in alfisol after harvest of sunflower (Helianthus annuus L.)

摘要

An experiment was conducted during rabi, 1995-96 to study the extent of depletion of inorganic P fractions by sunflower (Helianthus annuus L.) grown on Alfisol of medium P status. Application of P at different levels resulted in increase in contentsof P fractions over control. In control plots, the pattern of depletion followed the sequence AI-P > S-P > RS-P > Fe-P > Ca-P with values of 13.21, 12.22, 3.18. 2.13 and 0.98 percent at harvest of sunflower, respectively. The total sum of inorganic P fractions showed positive correlation (0.987~*) with the available P content at harvest of the crop.