Effect of Intensive Cropping and Fertilizer use on Organic and lioa sosinorganic Forms of Phosphorus in art Alluvial Soil.

Intensive and continuous cropping on an alluvial soil resulted in less depletion of inorganio P(13%) and more of organic P (45%) Nitrogen applied alone has shown similar (0.ceffect on these forms. Regular additions of inorganic P increased both inorganic (35.5%) and organic (90.0%) forms and farm yard manure applied in conjunction with optimum NPK dressing further enhanced the organic P. Progressive improvement in organic as well oas inorganic form was manifested with the rise in graded doses of NPK Cultivation with- bis out lapplication of phosphorus widened the C.org. P ratio but the ratio got narrowed em inf alOthe treatments containing optimum or higher doses of P.00)