Allelopathic effects of sorghum species on weed seed germination and dry matter accumulation in different soil types

Weeds are problematic and burdensome to many smallholder farmers in Zimbabwe. The continued existence of allelochemicals plants inhibit weed seed germination, plant growth nutrient uptake. A study was carried out assess the effects sorghum species on germination dry matter accumulation different soil types at Duncanstan Farm Featherstone, 3x3 factorial experiment laid a completely randomized design (CRD) with nine treatment combinations replicated four times. Soil type first factor sand, loam clay soils. Sorghum extracts, arundinacea halepense, formed second factor, control had no extract. All showed significant p<0.05 reduction germinated weeds treated S. halepense water extracts compared control. There decrease mean fresh seedlings both treatments all types. In sand soil, weights were 33.4g 36.3g respectively as 58.2g. Similarly, 15.4g 14.9g. conclusion, possess allelopathic which can be used for effective management. It is recommended that conserved bio-herbicides development synthetic herbicides.