Showing papers by "Central Tuber Crops Research Institute published in 1989"

Studies on Dioscorea rotundata starch properties

Abstract: Starch from six clonal selections of Dioscorea rotundata was isolated by standard procedure. The yield was between 20–24%. Various properties of these starches were compared. Granule size, 2% viscosity, peak viscosity, clarity, sol stability, total and soluble amylose contents were studied and only small variations were observed in the properties except paste viscosities among the clonal selections. The phosphorus content of Dioscorea starch was found to be three times as much as cassava starch, but low compared to potato starch. The higher gel strength of D. rotundata starch paste compared to cassava gel may be attributed to the phosphate linkages among the starch molecules in the granules. Untersuchungen uber die Eigenschaften der Starke von Dioscorea rotundata. Die Starke von sechs klonalen Auswahlen von Dioscorea rotundata wurde mittels eines Standard-Verfahrens isoliert Die Ausbeute betrug 20–24%. Verschiedene Eigenschaften der Starken wurden verglichen. Korngrose, Viskositat 2%iger Suspensionen. Spitzenviskositat, Klarheit. Solstabilitat, gesamte und losliche Amylose wurden untersucht und nur geringe Abweichungen in den Eigenschaften beobachtet, abgesehen von den Kleisterviskositaten unter den klonalen Auswahlen. Der Phosphorgehalt von Dioscorea-Starke war dreimal so hoch wie der von Cassavastarke, aber niedrig im Vergleich zu Kartoffelstarke. Die hohere Gelstarke von D. rotundata-Starkekleister im Vergleich zu Cassava-Gelen durfte den Phosphatbindungen zwischen den Starkemolekulen in den Kornern zuzuschreiben sein.

Productivity, soil fertility and soil erosion under cassava based agroforestry systems

Abstract: The interactions between component species in three-tier agroforestry systems were studied on sloping laterite soils of South India for three years. The wood yield of Eucalyptus was found to increase in association with the intercrops, with cassava + groundnut resulting in the best growth of Eucalyptus. Green forage yield of Leucaena was adversely affected by cassava but was improved by inclusion of a short duration seasonal crop. Both spread and mean length of lateral roots of Eucalyptus and Leucaena were restricted by cassava intercropping. Both the tree species were found to reduce the tuber yield of cassava and also the pod yield of both the seasonal crops when grown in association. Monocropping with cassava was found to improve the fertility and an increase in phosphorus and potassium contents of the soil was observed when grown in association with Eucalyptus and Leucaena. Soil fertility fell considerably after three years of cultivation of the tree species. The nutrient uptake by cassava was low when grown in association with perennial species. Both run off and soil loss were effectively reduced when cassava was grown in staggered mounds under Eucalyptus and Leucaena.