Mutsvandiani Et Al


Mutsvandiani et al

Greener Journal of Agricultural Sciences Vol. 5 (2), pp. 062-075, March 2015.

 ISSN: 2276-7770  

Research Paper

Manuscript Number: 082914341



The effect of
Herbicides on Residual Effects of Atrazine under Conservation Agriculture


Mutsvandiani Chikutuma1, 2,
Tembo Lovejoyand Kurangwa Wisdom1*


1Zimbabwe Open University1,
Faculty of Agriculture, P. O. Box MP1119, Mount Pleasant Harare Zimbabwe.

2Hatcliffe Institute of Agricultural
Engineering2, P. O. Box BW 338 Borrowdale, Hatcliffe, Harare,


*Corresponding Author Email: wkurangwa @


An experiment was set up to evaluate the residual
effect of atrazine in cowpea production under conservation agriculture. The
trial was superimposed on a previous herbicide trial of a maize crop in
2012/2013 season. The experiment was laid out in a randomized complete block
design with three replicates and four treatments as follows; 1. control (manual
weeding),  2.
Atrazine (3.6
litres/ha), 3. Atrazine (3.6 litres/ha) + glyphosate (2.5 litres/ha) and 4.
Atrazine (3.6
litres/ha) + glyphosate (2.5 litres/ha) + metolachlor (1 litre/ha). Herbicide
treatment was carried out at planting time and manual weeding at 10 cm weed
height. Data collected include: germination percentage, weed counts and weed
biomass, cowpea biomass, pod length and cowpea yield. The herbicidal treatments
showed a significant effect (p<0.05) on pod length and cowpea yield. The
control plot had the highest pod length of 17.03cm and atrazine alone had the
least of 15.77cm. A combination of three herbicides had the highest yield of
1.2t/ha and atrazine alone had the lowest yield of 0.9t/ha. No significant
(p>0.05) effects were recorded on percentage germination, weed counts and
weed biomass as well as on cowpea biomass. Tank mixing of two or more
herbicides is recommended when using atrazine to reduce residual effect and
further research is recommended under different soil types with different
climatic conditions.


Key words: conservation agriculture, atrazine,
cowpea, residual effect.


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