Author(s):

Sayali Sonavane, Ritu Thakare, RD Chaudhari and TD Patil

Abstract: The present experiment was conducted at research farm of Department of Soil Science and Agricultural Chemistry, College of Agriculture, Dhule. Phosphocompost was prepared by using Parthenium and cassia weed along with low grade rock phosphate by pit method. Treatment composed of Parthenium and cassia weed incorporated with three levels of rock phosphate i.e. 4, 8 and 12 per cent of weed residues. Organic carbon content was continuously decreased with increase in period of composting as well as slight decrease was also noticed with increased rock phosphate levels. The maximum total N (1.87 %) and total P (1.48 %) contents were recorded in the phosphocompost prepared from cassia weed + 12 % rock phosphate. The C:N ratio was found to be gradually declined with period and rock phosphate levels. The lowest C:N ratio (16.33) was noticed under cassia weed + 12 % rock phosphate compost. The highest humic acid and fulvic acid contents (1.12 and 10.42 g 100 g^-1) were noted in cassia weed + 12 % rock phosphate compost. Also, the significant decrease in E4/E6 ratio of both humic acid and fulvic acid was noticed. The lowest E4/E6 ratio of humic and fulvic acid (1.25 and 4.55) recorded with cassia weed + 12 % rock phosphate compost. The significantly maximum fungal, bacterial, actinomycetes and PSB population were recorded in compost prepared from cassia weed. The dehydrogenase activity and alkaline phosphatase activity significantly increased with increased level of rock phosphate.

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