Growth and yield analysis of five sweet potato cultivars under different levels of shade. Working Paper no. 89-12.
1989
Demagante A.L. | Opena G.B. | Vander Zaag P.
Solar radiation is a limiting factor for sweet potatoes under shade crops as well as during the rainy season in the tropics. Five diverse sweet potato genotypes were analyzed through growth analysis under shading in the Philippines. Shading generally promoted vine growth but delayed storage root formation particularly for the traditional cultivars. All cultivars were sensitive to 70% shade as indicated by low dry matter production throughout the growing period. Reduction of dry matter accumulation due to shading was primarily attributed to the reduction in solar radiation for interception rather than the size of the crop cover. Assimilate partitioning to the storage roots decreased with increasing shade. This effect was more severe for sinuksuk [cultivar] due to its delayed roots formation and its limited sink size (storage root number). Miracle and VSP-5 were less sensitive to 33% shade relative to the other cultivars. With these cultivars less than 8 MJ/m.sq./day was detrimental to early growth and storage root formation. There were significant genotype x shade interactions for yield components. The late maturing cultivar sinuksuk responded more adversely to shade than the other genotypes.
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