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Item Studies on the rate and time of top dressing nitrogen for rice 'var. Jaya(Kerala Agricultural University, 1972) Paul Mathew, M; Sadanandan, NItem Perfomance of ginger (Zingiber officinale Roscoe) under graded doses of nitrogen(Kerala Agricultural University, 1979) Sadanandan, N; Sasidharan, V KItem Response of sesamum variety Kayamkulam 1 to graded doses of phosphorus and potash in the red lom soils of Vellayani(Kerala Agricultural University, 1978) Sadanandan, N; Sasidhar, V KItem Crude protein content of guinea grass and component crops under different spacings(Kerala Agricultural University, 1979) Krishna Raj, P; Sadanandan, N; Nair, K P M; Sasidhar, V KItem Protein content of grain as affected by the application of urea and neam coated urea to rice variety – triveni(Kerala Agricultural University, 1974) Abraham, C; Sadanandan, N; Sasidhar, V KItem Performance of tapioca after cowpea in multiple cropping(Kerala Agricultural University, 1974) Sasidhar, V K; Sadanandan, NItem Effect of different levels of nitrogen and phosphorus on the uptake of phosphorus by rice variety - triveni(Kerala Agricultural University, 1974) Alexander, K M; Sadanandan, N; Sasidhar, V KA field experiment was undertaken during the third crop season of 1971 to study the effect of different levels of nitrogen and phosphorus on the uptake of phosphorus by the rice variety 'Triveni'. It was found that with increasing levels of nitrogen, the total uptake of phosphorus increased during all the growth stages of the crop. Similarly nitrogen phosphorus interaction significantly increased the phosphorus uptake at harvest. Different levels of phosphorus had no significant effect on the uptake of phosphorus during any of the growth stages of the crop.Item Studies on the comparative performance of granular weedicides on rice(Kerala Agricultural University, 1975) Vikraman Nair, R; Sadanandan, NThe field experiment was conducted in the farm attached to the Agricultural College, Vellayani frr a period of two seasons to evaluate the performance of three granular weedicides on the lethality of weeds of rice and on the growth and yield of rice. There was no effect on the growth and yield of rice or on number and dry weight of weeds. The differences between unweeded control and continuously hand weeded treatment also remained nonsignificant both in terms of rice yield and weed growth. This points to the fact that continuous water logging itself was effective in keeping down weed growth and in preventing the consequent effect on rice yield. There was no apparent toxicity of the chemicals on the existing weed species of the area.Item Effect of multiple cropping on the organic carbon status of upland alluvial soils(Kerala Agricultural University, 1975) Sadanandan, N; Mahapatra, I CA field experiment at (he Central Rice Research Institute. Cultack. Orissa State on multiple cropping conducted during the years 1967.68 and 1968-69 showed that there was a decrease in organic carbon content of soil in all cropping patterns after each cycle, the maximum decrease being noticed in continuous cultivation of rice, i. e. rice-rice cropping pattern. Among individual crops there was an increase in organic carbon content after potato and maize crops, whereas, there was a decrease after dalua and kharif rice crops.Item Study on the comparative performance of urea and neem coated urea on the yield and yield attributes of rice variety triveni(Kerala Agricultural University, 1975) Abraham, C; Sadanandan, N; Sasidhar, V KA field experiment to study the comparative performance of urea and neem coated urea on the yield and yield attributes of rice variety-Triveni was conducted at the College of Agriculture, Vellayani, Kerala during Virrippu season of 1973. The treatments consisted of four levels of nitrogen (0), 40, 80 and 120 kg N/ha) and five methods of applications ie. (1) full basal urea (2j full basal neem coated urea (3) 75% basa! urea -I- 25% urea as top dressing (4) 75% basal urea 4- 25% neem coated urea as top dressing, and (5) 75% basal neem coated urea + 25% neem coated urea as top dressing. It was found that the number of panicles per square meter, 1000 grain weight and yield of grain and straw were increased by nitrogen application. The application of 40 kg nitrogen as neem coated urea was found to be equivalent to 80 kg nitrogen as urea as far as the yield of grain was concerned. The results showed that rieem cake can be profitably used to increase the efficiency of urea applied to wet land rice.