Weed interference in cassava. Maize intercrop in the rain forest of Nigeria
1984
Unamma, R.P.A. | Ene, L.S.O. (National Root Crops Research Institute, Umudike (Nigeria))
In 1981-82, we conducted studies of cassava and maize intercropped on sandy loam in the rain forest zone of Nigeria to determine when and how long the plants had to be kept weed free. The major weeds present in the control (8 weeks after planting) were mainly annual broadleaves, grasses and sedges. Uncontrolled weed growth caused a 2 year average loss of $5607/ha in yield value compared with the mixture kept weed free from planting to maturity. Average value of yield for 2 years ($9206/ha) from the cassava-maize intercrop was much higher than that for the sole crops, although yield in grain and roots was lower. The yield of the crop mixture was depressed by weed interference during the first 4-8 weeks; however weeds emerging after this period did not significantly impair the yield.
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