Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Integration of Brassica amendments and summer irrigation for weed suppression in clusterbean (Cyamopsis tetragonoloba) in hot arid regions.

Abstract

A field experiment was conducted during 1998 and 1999 at Jodhpur, Rajasthan, India to investigate the efficacy of Brassica amendments (mustard oil-cake and pod straw at 2.5 tonnes/ha) during summer in the suppression of weeds and its effect on the seed yield of the subsequent clusterbean (Cyamopsis tetragonoloba) crop. Incorporation of Brassica amendments with one summer irrigation at high soil temperature (39-44°C) significantly reduced the population of summer and rainy-season weeds by 43 and 11%, respectively, in all amended plots compared to their application at the time of normal sowing in July at moderate soil temperature (23-35°C). The significant reduction in summer weeds was equal with the amendment of mustard oil-cake and mustard pod straw. Of the common summer weed species, "kag nasha" (Corchorus tridens), "balu ka sag" (Gisekia pharnaceoides), heliotrope (Heliotropium subulatum), stink grass (Eragrostis ciliaris) and carpet weed (Mollugo cerviana) were suppressed completely in amended plots. These combinations also significantly reduced the weed population by 44% during the succeeding rainy season in the clusterbean crop. Mustard oil-cake with one irrigation increased the seed yield by 3 and 61% over its incorporation in the rainy season and non-amended control, respectively. The corresponding values for mustard pod straw were 7 and 32%, respectively.