The Agronomic effectiveness of Liquid Manure extracts derived from comfrey (Symphytum officinale) and tithonia (tithonia diversifolia).
Greenhouse and field studies were conducted to evaluate manure extracts
and their effect on crop yield and selected soil chemical and microbial
properties in Zambia. For the green house study, comfrey and tithonia plant
materials were each used at varying rates. Application of manure
extracts increased biomass yield of both rape and tomato, with comfrey being the most effective. The
leaf biomass increased with increased biomass of comfrey, while no
particular pattern was observed for tithonia. Mixing of comfrey and tithonia residues in the preparation
of their manure extracts resulted in substantially increased tomato yield. Furthermore soil pH,
P,K,Ca,Mg were positively influenced by the application of manure
extracts.
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