The Israeli Journal of Aquaculture - Bamidgeh 52(3), 2000, 118-126
EFFECT OF ORGANIC MANURES ON ORGANIC CARBON
CONTENT OF SUBMERGED POND SOIL
D.K. Chatterjee and P.K. Saha
Central Institute of Freshwater Aquaculture, Kausalyaganga, Bhubaneswar, Orissa, 751002, India
(Received 19.9.98, Accepted 8.11.00)
Application of organic manures (cow dung, poultry manure, mustard oilcake or compost) at three
levels (300, 600 or 1200 kg C/ha) to pond soil with a low (0.45%) or medium (1.33%) organic carbon
content resulted in a significant (p<0.01) increase in organic carbon in both soils. The increase
of soil organic carbon was higher in both soils under incubation (5.7-20.41% and 15.08-29.93%) than in soils used for rearing of carp spawn (2.65-14.99% and 1.82-6.07%).
A similar increase in organic carbon for low-carbon and medium-carbon soils (5.77-7.83% and
2.86-5.15%, respectively) was observed after three months of applying nitrogen (0.2 ppm), phosphorus
(0.1 ppm) and 10, 30 or 60 kg C/ha at monthly intervals. The lowest increases (5.77% and
2.86%) occured in the 30 kg C/ha/month treatment.