1. KAUTIR (Kerala Agricultural University Theses Information and Retrieval)
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Item Nutritional status of soils and the incidence of the bunchy top disease of banana (Var Java)- Part VI Effect of application of calcium and magnesium to soil on the ratio of Calcium oxide/Magnesium oxide in the plant and its relation to bunchy top infection(Division of Agronomy, Agricultural College and Research Institute, Vellayani, 1968) Balakrishna Pillai, P; Nair, C K NExperiments were laid out under semi-field conditions to study the effect of combined application of calcium oxide and magnesium oxide at different concentrations to soil in the ratio of 3:1. The absorption of calcium , magnesium, nitrogen, phosphorus and potassium by plants from soils containing varying quantities of calcium oxide and magnesium oxide was studied. The plants were allowed to be infected by releasing the virus carrying sphids after the initial period of growth, to study whether there was any resistance to the incidence of bunchy top.Item Differential response of two medium duration rice varities to time of planning and graded doses of nitrogen(Department of Agronomy, College of Horticulture, Vellanikkara, 1982) Lathif, P H; Balakrishna Pillai, PAn experiment to study the differential response of two medium duration rice varieties to time of planting and graded doses of nitrogen was conducted during the mundakan season of 1980 – 81, at the Research Station and Instructional Farm Mannuthy. The experiment was laid out in split plot design, with combinations of four time of planting (September 25th, October 10th, October 25th and November 9th) and 2 varieties (Jaya and Sabari) in the main plot and 3 levels of nitrogen (60, 90, 120 kg/ha) in subplots. Observations on the plant growth characters were recorded at 30th day, 60th day after planting and at harvest. Chemical analysis of plants at these stages were also done. Time of planting significantly influenced the growth characters as well as the yield and yield attributes. Plant height, panicle length, number of spikelets, number of filled grains, percentage of filled grains, dry matter production, grain yield, straw yield, harvest index, grain straw ratio, total nitrogen uptake at harvest, nitrogen uptake by grain, content of phosphorous in straw and grain and the total uptake of phosphorous at harvest and potassium uptake by grain were significantly higher in the early planted crop, than in later planted crops. However, number of days taken to 50 per cent flowering, and to maturity, production of tillers and productive tillers, phosphorous content of straw and potassium content of grain were positively influenced by delayed planting. Sabari recorded significantly higher number of days to flowering and maturity than Jaya. Higher levels of nitrogen were found to increase the dry matter production and nitrogen, phosphorous and potassium content of straw.Item Effect of different levels of Nitrogen,Phosphorus and Potassium on Growth and yield of Cowpea,(Vigna sinensis Savi) variety P.118(Department of Agronomy, College of Horticulture, Vellanikkara, 1978) Mohankumar, B; Balakrishna Pillai, PAn experiment was conducted at the Instructional Farm, Vellanikkara, during the second crop season of 1977 to study for effect of different levels of nitrogen, phosphorus and potassium on the growth and yield of cowpea, variety P. 118. The experiment was laid out in a 33 confounded factorial design confounding N P2 K and NP2 K2 in replications I and II, respectively. The study revealed that plant height increased with incremental doses of nitrogen. Nitrogen at 20kg/ha level contributed to increased nodulation which in turn favorably increased the grain yield. Phosphorus also had significant positive effect on nodulation. Nitrogen at 20 kg/ha and phosphorus at 40 kg P2O5 /ha exerted significant positive influence on the total dry matter production of the crop at harvest. Through their increased response in terms of number of pods per plant, number of seeds per pod and length of pods, nitrogen, at 20 kg ha and P2O5 at 40 kg/ha increased the grain yield per hectare significantly. Application of nitrogen at 30 kg/ha registered the maximum haulm yield. The grain haulm ratio was maximum for the combination of 20 kg nitrogen and 40 kg P2O5/ha Nitrogen at 21.6 kg/ha was found to be the optimum level for maximum grain production. The optimum level of phosphorus could not be estimated since the crop exhibited a linear response beyond the maximum level tried. Nitrogen application increased the plant content as well as the grain content of the element. Similarly application of phosphorus and potassium increased the plant contents of phosphorus and potassium, respectively. The uptake by nitrogen and phosphorus was significantly influenced by the 20 kg/ha and 40kg P2O5 /ha The protein content of grain increased with increasing levels of nitrogen. Applied potassium did not exhibit any significant influence on the yield components and most of the growth attributes.