during 2020-21 to observe the effect of incubation duration of organic manures on chemical properties viz. pH, electrical conductivity (EC), soil organic carbon (SOC), available nitrogen, phosphorus and potassium. The experiment was laid out in a complete randomized block design (CRD) with three replication and seven treatments. The treatment comprised of (T1) soil + FYM @ 10 t ha -1 , (T2) soil + Vermicompost @ 5 t ha -1 , (T3) soil + Poultry manure @ 5 t ha -1 , (T4) soil + Press mud compost @ 5 t ha -1 , (T5) soil + Goat manure @ 5 t ha -1 , (T6) soil + Urban compost @ 10 t ha -1 and (T7) absolute control. Results indicated that incorporation of organic manures to soil significantly influenced soil properties. The effects of organic manures on soil varied with manure type and incubation period. The application of FYM @ 10 t ha -1 recorded significantly lower pH (7.73). However, the treatment vermicompost @ 5 t ha -1 was at par with treatment FYM @ 10 t ha -1 . The significantly highest EC was recorded with the application of press mud compost @ 5 t ha -1 (1.22 dS m -1 ). The application of poultry manure significantly influenced soil available N, P and K content. The organic carbon content significantly increased at 15 days of incubation and further decreased from 30 days of incubation. The highest organic carbon content was observed with application of FYM @ 10 t ha -1 (0.68% at 15 days of incubation).

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Soil is the system which supplies plant with available nutrients through the root. Physical and Chemical analysis of the soil are carried out to indicate the efficiency of soil for supplying plants with nutrients in available forms as well as identification of the factors affecting this efficiency in the soil. Therefore, besides perfect sampling in the field, soil samples must be properly prepared and analyzed in order to reach the correct evaluation of the soil nutritional status. Soil is the mixture of minerals, organic matter, gases and countless organisms that together support plant life. Soil is considered to be the "skin of the earth" with interfaces between the lithosphere, hydrosphere, atmosphere of Earth, and biosphere. Soil consists of a solid phase (minerals and organic matter) as well as a porous phase that holds gases and water. Accordingly, soils are often treated as a three-state system Soil is the end product of the influence of the climate, relief (elevation, orientation, and slope of terrain), organisms, and parent materials (original minerals) interacting over time. Soil continually undergoes development by way of numerous physical, chemical and biological processes, which include weathering with associated erosion. Most soils have a density between 1 and 2 gram per cubic centimeter.

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