Comparative Efficiency of Oxalic Acid Industrial Waste Acidulated Rock Phosphate and super Phosphate on Dry Matter Yield and Nutrition of Gram

Abstract

The results of a green study conducted in chromustert clay soil of Jabalpur having pH 7.1, E.C. 0.24 ds m^-1 shows that applications of 120 ppm rock phosphate (RP) acidulated with 13.2 g pot^-1 oxalic acid industry waste (OAIW) gave highest dry matter yield of gram which was 14.67 g pot^-1 whereas application of same amount of P₂O₅ through superphsophate (SP) produced 12.16 g pot^-1 dry matter yield. Application of RP alone had no effect on dry matter yield; however, application of increasing levels of P₂O₅ through SP gave successive increase in dry matter yield. Application of waste acidulated RP and superphosphate alone not only improved the available nitrogen, phosphorus and sulphur content in the soil but it also improved the nutrition of the crop as judged from the uptake of these nutrients. The pH and EC of the soil was not affected by the use of OAIW. The results indicate that use of OAIW as an acidulator of rock phosphate will be beneficial.