Jan 1, 2022 · Several organic manures are used in agriculture such as farm yard manure, compost, vermicompost, sheep manure, poultry manure, neem and oil cake etc. Soil application of manures/composts helps in improving plant growth, development, soil water holding capacity, increased gas exchange, hydraulic conductivity, water permeability, improved root zone environment, soil pH, EC, OC, CEC, N, P, K