Shade tolerance in sweet potato varieties under intercrop with maize. Working Paper No. 90-8
1990
Chujoy, E. | Ona, I.
Sweet potato clones were screened for shade tolerance resulting from an intercrop with maize. In one experiment maize and sweet potato were planted the same date and most shade occurred between 85 to 120 days after planting (DAP). Plants under shade had a drastic reduction in root yield and root size compared to full sunlight grown counterparts; root yield was reduced by 60 and 65% at 90 and 120 DAP, respectively; similarly root size was reduced by 44 and 59%, respectively. Several higher yielding clones under shade were identified. In a second experiment sweet potato was planted 30 days after maize. Most shade occured from 20 to 60 DAP. Foliage growth and storage root formation was severely limited by shade. Twelve out of 183 clones produced any yield. In a third experiment, clones selected, for yield were compared with clones randomly chosen from a germplasm collection. The selected clones had higher yield and larger root size compared to the unselected ones. This result suggests that clones selected for yield under full sunlight may also be the best under shade.
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