The aim of present study was to observe the allelopathic influence of selected leguminous cover crop on the germination of Imperata brasiliensis Trin) and Ageratum conyzoides L., two of the most noxious weeds in the humid tropics of Latin America. Whole mature plants of eight leguminous cover crops (Cajanus cajan (L.) Millsp., Calopogonium mucunoides Desv., Canavalia brasiliensis Mart. Ex Benth., Crotalaria juncea L., Mucuna pruriens var. utilis (L.) DC, Pueraria phaseoloides (Roxb.) Benth., Vigna unguiculata (L.) Walp. and Stylosanthes guianensis (Aubl.) Sw.) were used. Five water extracts of the cover crops residues were used. Treatments of 0 (control), 1.0, 2.0, 3.0 and 4.0% (w/v) prepared by soaking residues in distilled water in 500 ml flasks at 27°C for 24 hours, were utilised. Results on Imperata showed a significant species effect on the epicotyl length and dry weight of seedlings. The 1% level of Mucuna and Calopogonium promoted the germination of Imperata by 10 and 15% respectively compared to the control while, all the other species showed a decrease in the germination starting from the first level. The strongest negative effect on germination was observed using Vigna. Results on Ageratum stressed a significant influence of both mean effects and the interaction. From the lowest level of extract of Cajanus, Calopogonium and Vigna,, the germination of Ageratum was strongly inhibited with a mean reduction of 72%. It can be concluded from this study that the non-competitive effects of cover crops merit a full attention in order to the choose of the species in relation to the weed competition during germination.

Allelopathic evaluation of selected cover crops for weed control in the humid tropics / P. CASINI. - In: ALLELOPATHY JOURNAL. - ISSN 0971-4693. - STAMPA. - 14:(2004), pp. 51-58.

Allelopathic evaluation of selected cover crops for weed control in the humid tropics

CASINI, PAOLO
2004

Abstract

The aim of present study was to observe the allelopathic influence of selected leguminous cover crop on the germination of Imperata brasiliensis Trin) and Ageratum conyzoides L., two of the most noxious weeds in the humid tropics of Latin America. Whole mature plants of eight leguminous cover crops (Cajanus cajan (L.) Millsp., Calopogonium mucunoides Desv., Canavalia brasiliensis Mart. Ex Benth., Crotalaria juncea L., Mucuna pruriens var. utilis (L.) DC, Pueraria phaseoloides (Roxb.) Benth., Vigna unguiculata (L.) Walp. and Stylosanthes guianensis (Aubl.) Sw.) were used. Five water extracts of the cover crops residues were used. Treatments of 0 (control), 1.0, 2.0, 3.0 and 4.0% (w/v) prepared by soaking residues in distilled water in 500 ml flasks at 27°C for 24 hours, were utilised. Results on Imperata showed a significant species effect on the epicotyl length and dry weight of seedlings. The 1% level of Mucuna and Calopogonium promoted the germination of Imperata by 10 and 15% respectively compared to the control while, all the other species showed a decrease in the germination starting from the first level. The strongest negative effect on germination was observed using Vigna. Results on Ageratum stressed a significant influence of both mean effects and the interaction. From the lowest level of extract of Cajanus, Calopogonium and Vigna,, the germination of Ageratum was strongly inhibited with a mean reduction of 72%. It can be concluded from this study that the non-competitive effects of cover crops merit a full attention in order to the choose of the species in relation to the weed competition during germination.
2004
14
51
58
P. CASINI
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/595048
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