A greenhouse experiment was conducted with wheat to assess the availability of P to wheat crop from biogas slurry (BGS) and farmyard manure (FYM) application. Dry matter yield and total P uptake of wheat increased significantly with graded levels of both FYM and biogas slurry. However, per cent increase in dry matter yield was more pronounced under biogas slurry treatments. Addition of biops slurry improved overall soil P status to higher level as compared with FYM. Adsorption of added P decreased significantly with incorporation of both FYM and biogas slurry. Desorption of P was relatively higher in soils amended with organic manures as compared to control. Cumulative P desorption correlated both with dry matter production and P uptake by wheat. These results clearly indicate that biogas slurry is comparatively a better source of organic P for wheat:sproduction as compared to farmyard manure.
Integrated phosphorus management, wheat, farmyard manure, biogas slurry, adsorption, desorption
