Abstract
This study evaluated the effects of organic amendments-rice husk and poultry manure-on soil microbial activity and nutrient availability in tomato farms in Nnewi, Nigeria. A randomized complete block design was employed with four treatments: control, rice husk, poultry manure, and a combination of both, each replicated thrice. Soil samples were analyzed for microbial activity via dehydrogenase enzyme activity and for available nutrients (N, P, K) at three stages: baseline, mid-season, and harvest. Results showed that the combined application significantly enhanced microbial activity (65.4 μg TPF g-1 soil) and increased available nitrogen (18.5 mg kg-1), phosphorus (16.8 mg kg-1), and potassium (152.4 mg kg-1) compared to other treatments. Organic amendments, especially when combined, improved soil biological functions and nutrient status, supporting sustainable tomato production. These findings underscored the potential of organic waste recycling to improve soil fertility and microbial health in tropical soils with low natural fertility.
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