Comparative Evaluation of Different Organic Fertilizer on the Soil Properties, Fertility and Leaf Mineral Composition of Rape: Case Study of Mkushi District in Central Zambia

This research explores the comparative effects of different organic fertilizers on soil properties, soil fertility, and the leaf mineral composition of rape (Brassica napus) in Mkushi District of Central Province, Zambia. The study specifically evaluates poultry manure, goat manure, and cow manure, alongside a control treatment with no fertilizer application. Plant metrics such as growth performance, biomass yield, and the concentration of essential minerals in rape leaves were also analyzed. The experimental design involved randomized plots under uniform environmental conditions to ensure comparability. Results demonstrated significant variations in the effectiveness of the organic fertilizers, with poultry manure showing the highest improvement in soil fertility and plant mineral uptake, followed by goat and cow manure. The control treatment resulted in lower soil fertility and suboptimal plant growth. This study highlights the potential of locally available organic fertilizers in enhancing soil health and sustainable crop production, particularly for smallholder farmers in Zambia. The findings provide critical insights for promoting organic farming practices that mitigate environmental degradation and improve agricultural productivity in the region.