Abstract

Organic cultivation promotes sustainable agriculture and is environmentally friendly. In order to achieve it a suitable combination of organic amendments are yet to be standardized. Therefore, a field study was conducted to evaluate the impact of different organic source in different proportions without inorganic source and with inorganic fertilizers on soil nutrients and carbon pools in wheat field at farms of School of Agriculture, Lovely Professional University, Phagwara, Punjab. Treatments were designated as T0-Control, T1–100% RDF, T2–50% RDF+25% vermicompost+25% FYM, T3–50% RDF+25% vermicompost+ 25% bone meal, T4–50% RDF+25% vermicompost+25% poultry manure, T5–50% RDF+25% vermicompost+25% sewage sludge, T6–25% vermicompost+25% FYM+25% poultry manure+25% bone meal, T7–25% vermicompost+25% sewage sludge+25% poultry manure+25% bone meal. Results revealed that, soil organic carbon found high in T6 and T7. Labile carbon and microbial biomass carbon were found high in T7 as compared to other treatments. Available nitrogen was high in T1 with 100% RDF followed by T4. Available phosphorus was found high in T1 and T2 which indicated that use of inorganic source alone or integrated use of organic and inorganic fertilizers tend to have the similar impact on soils under wheat cultivation. Available potash is found high in treatment T1 and T6 which also suggest that the potential of different organic manures in different proportion has the ability to enhance potash availability. Current study concluded that for alluvial soils like in Punjab, organic manures from different sources in equal proportions significantly increase yield and in long term cultivations such amendments were recommended.