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Item Studies on the effect of methods of nitrogen application on mineral uptake of high yielding sweet potato varieties(Kerala Agricultural University, 1976) Alexander, D; Sadanandan, N; Vikraman Nair, RA field experiment was conducted in the red loam soils of the farm attached to the College of Agriculture, Vellayani during November 1972 to March 1973 to study the effect of methods of nitrogen application on nitrogen uptake of three sweet potato varieties i, e. H 41, H42 and Kottaranchola. The results showed that nitrogen uptake was markedly affected by methods of application. Uptake was more when nitrogen was applied in two split doses., i. e. half at planting and the remaining half as foliar spray 35 days after planting. Full basal application resulted in the lowest uptake of nitrogen. It was also observed that there was a translocation of considerable portion of nitrogen from vines to developing tubers.Item Effect of CCC (2-chloroethyl trimethyl ammonium chloride) on growth and yield of sweet potato variety H 42(Kerala Agricultural University, 1976) Nambiar, I P S; Sadanandan, N; Mohamed Kunju, UItem Analysis of yield and its components in sweet potato (Ipomoea batatas L.)(Kerala Agricultural University, 1976) Pushkaran, K; Sukumaran Nair, P; Gopakumar, KAnalysis was carried out for studying the yield-component inter-relationship in seventeen varieties of sweet potato. Determination of the coefficients of simple and mutual correlations and path at the levels of the first and second order components reveals that an increase in the length of vine causes significant increase in tuber yield. But at the same time, the overall area of leaf should not be allowed to increase, because this character bears a negative relationship with yield. An ideal plant type with longer vines, w i i i i small, narrow and deeply lobed leaves with appropriate orientation on the viue for effecting better photosynthetic efficiency, should be aimed at for selecting potentially high yielders.Item Effect of graded doses of nitrogen on growth and yield of sweet potato variety, H.42 in red-loam soils(Kerala Agricultural University, 1976) Nambiar, I P S; Sadanandan, N; Mohamed Kunju, UA field experiment was conducted in the red-loam soils of Agricultural College Farm, Vellayani during 1974-1975 to study the effect of graded doses of nitrogen (50, 75 and 100 kg/ha) on the growth and yield of sweet potato, variety H. 42. The length of vine, weight of vine, and length of individual tuber were not significantly influenced by levels of nitrogen whereas the number of tubers per plant was significantly increased due to incremental doses of this nutrient and the response was linear. The yield of tuber was increased progressively with incremental doses of nitrogen. Nitrogen at 100 kg. /ha recorded an yield of 104.92 quintals of tuber per hectare while 50 kg. N/ha gave only an average yield of 81.43 quintals.Item Effect of CCC on the starch content of sweet potato tuber(Kerala Agricultural University, 1977) Nambiar, I P S; Sadanandan, N; Mohamed Kunju, UItem Fodder production potential of sweet potato (Ipomoea Batatas)(Kerala Agricultural University, 1980) Raghavan Pillai, G; Kamalam Joseph; Sreedharan, CItem New records of insect pests of sweet potato in Kerala(Kerala Agricultural University, 1982) Rajamma, PItem Gamma ray induced variation for yield in sweet potato(Kerala Agricultural University, 1995) Suma Bai, D I; Nayar, N K