Effects Of Organic Amendments On Soil Nutrients:- Nnamdi, Justina U

Organic Amendments, Soil Fertility, Soil Nutrients, Compost, Farmyard Manure. ? ! ABSTRACT The main objective of this paper is to review the main effects of organic amendments on soil nutrients. The review showed that both organic amendment types could improve the physical, chemical jand biological characteristics ofsoil quality in a dose dependent manner and frequency of application. Organic amendments play a positive role in chemical characteristics of the soil including increase in organic carbon (up to 58% with 120 t ha-1 versus unfertilized soil) and organic nitrogen up to 90% depending on the type and the level applied. Repeated application of organic amendments to cropland led to an improvement ofmicrobial biomass by up to 100% and increased enzymatic activity by 30%. However, organic amendments have more of long-term return rather than short-term positive effect and there is competition of organic materials for the purpose of fodder or fuel. As a result, additional measures such as physical and biological soil conservation measures s