Linkages between crop residues, termite prevalence, crop lodging and subsequent crop yield under conservation agriculture in Zimbabwe
Abstract
173 words
Farmers believe that addition of residues to fields in conservation
agriculture (CA) attract termites hence increase lodging,
although they are beliefs that termites prefer feeding on dry
matter and leave the crop. This study carried out in Kadoma
and Chikombedzi, Zimbabwe established links between crop
residues, termite prevalence, crop lodging and yield. Results
from Kadoma showed that in 2008/9, 4t/ha of residue had
significantly more termites compared to conventional
mouldboard plough systems (CMP). In 2009/10, 4 and 6t/ha
residues resulted into a significantly higher termite compared
to CMP. In both seasons in Chikombedzi, results were similar
with those of Kadoma. In Chikombedzi in 2009/10, lodging in
CA was significantly higher compared to CMP. In Kadoma
2008/09, yields (2900-3348kg/ha) were significantly higher under
CA compared to CMP (2117kg/ha). Similar results were
obtained at Chikombedzi. A significant and positive relationship
was observed between percentage soil moisture and termite
numbers, suggesting that CA attract termites although it also
increases yields. It is therefore necessary to integrate termite
control measures in maize production under conservation
agriculture systems.
Subjects
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