Abstract
Abstract In mixed cropping and intercropping systems, cassaca ( Manihot esculenta Crantz) is subjected to shade during its early growth and development by the associated crops. To determine the effect of shading on its development and yield, cassava was subjected to six shade regimes (0, 20, 40, 50, 60 and 70% of full sunlight). The 2-year field study was undertaken on a sandy clay loam soil (Oxic Paleustalf or Ferric Luvisol) in southwestern Nigeria. Plant height increased while leaf area index decreased as percentage of shade increased. Stem and leaf dry weight increased with decreasing degree of shade. All levels of shade delayed tuber bulking. Compared to the 0% shade or control, the 20, 40, 50, 60 and 70% shade levels reduced cassava yield by 43, 56, 59, 69 and 80% respectively. Suggestions for improving cassava productivity in mixed cropping and intercropping systems include the use of late-maturing cassava varieties, reducing the population of the associated crop and allowing long recovery intervals after the harvest of the intercrop.
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