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Providing evidence to improve practice

Individual study: Use of sorghum allelopathic properties to control weeds in irrigated wheat in a semi arid region of Punjab

Published source details

Cheema Z.A. & Khaliq A. (2000) Use of sorghum allelopathic properties to control weeds in irrigated wheat in a semi arid region of Punjab. Agriculture, Ecosystems & Environment, 79, 105-112

This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.

Incorporate plant remains into the soil that produce weed-controlling chemicals Natural Pest Control

A randomised, replicated, controlled trial in 1996-1997 in wheat Triticum sp. fields in Punjab province, Pakistan (Cheema & Khaliq 2000) found plots with sorghum Sorghum bicolor stalks incorporated into the soil had significantly fewer weeds (38-51 plants/m², 20-41% weed suppression) than unweeded controls (64 plants), similar numbers to hand-weeded controls (33 plants, 49% suppression) and more weeds than herbicide-treated controls (12 plants, 82% suppression). Wheat grain yield was 6-17% higher in sorghum residue plots than unweeded controls, 10% higher in hand-weeded than unweeded controls, and 22% higher in herbicide-treated than unweeded controls. The net benefits of sorghum residue (15,040-15,770 Rupees) were similar to those of unweeded controls (15,768 Rupees) but lower than hand-weeding (16,480 Rupees) or herbicide application (17,477 Rupees). After harvesting, sorghum was dried, cut into 2 cm pieces and incorporated 3-5 cm deep during seedbed preparation. Wheat was sown on 21 November 1996, at 45 kg/ha. Plots were 1.5 x 7.5 m with four replicates. There were six treatments: unweeded control; 2, 4, 6 t/ha sorghum residue; herbicide treatment: Chlorotololuron + MCPA at 2.5 kg/ha; hand weeding. Weed density and biomass were recorded in two 1 m² quadrats/plot, 60 or 90 days after sowing.