Growth analysis of cassava (Manihot esculenta crantz)
1988
Opas Boonseng
First experiment was the study on growth analysis of 3 cassava varieties. The second experiment was the study on the relationship of leaf retention in the dry season and the incidence of brown leaf spot disease with yield and some agronomic triats of 547 cassava clones in single row trial. The first experiment indicated that leaf area index and characteristics of cassava leaves, i.e. leaf size, leaf production rate per apex, leaf longevity, specific leaf area, leaf chlorophyll content and depth of leaf layer were high during the rainy season and were much less during the dry season. Leaf area index was positively correlated with crop growth rate, root growth rate and net assimilation rate. Nontheless, varietal differences in leaf area index were not observed. Leaf area indexes of less branching varieties, root starch and root dry matter content which represented root quality varied according to seasons and varieties. The second experiment, number of leaf retention was positively correlated with root yield (r=0.120** ) and root starch content (r=0.109* ), but negatively correlated with harvest index (r=-0.008* ). Number of leaves infected by brown spot disease was negatively correlated to number of leaf per plant (r=-0.406** ) but was not correlated with root yield. Brown leaf spot disease caused leaf defoliation, but its effect on yield was not prominent.
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