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ThesisItem Open Access Studies on the performance of two groundnut varieties, TMV-2 and TMV-9, under graded doses of phosphorus and potassium.(Department of Agronomy, College of Agriculture, Vellayani, 1978) Purushothaman Nair, N; KAU; Sadanandan, NThesisItem Open Access Comparative studies on the fixation of nitrogen by certain common legumes(Division of Agronomy, Agricultural college & reseach institute Vellayani, Trivandrum, 1963) Rose, H L; KAU; Madhavan Nair, KThesisItem Open Access Studies on the effect of graded doses of phosphorus in conjunction with lime on growth , yield & phoperous uptake in rice (Oryza sativa Linn.) Var. IR B.(Division of Agronomy, Agricultural college & reserach institute Vellayani, Trivandrum, 1969) Suseelan, P.; KAU; George, C MThesisItem Open Access Studies on the effect of N, P and K fertilization on the growth and yield of chilli (Capsicum annuum, L.)in red loam soils of Kerala(Division of Agronomy, Agricultural college & reseach institute Vellayani, Trivandrum, 1968) Mohamed Kunju, U; KAU; George, C MThesisItem Open Access Studies on the effect of fertilizers on the growth, yield and quality of oil of citronellla(Division of Agronomy, Agriculture college and research institute Vellayani , Trivandrum, 1966) Ravindranathan Pillay, G; KAU; Madhavan Nair, KThe present investigation was undertaken at the agriculture college and research institute , Vellayani during 1964-66 to study the influence of fertilizers on growth yield and quality of oil in citronella.The effect of nutrients nitrogen and potach at three level each and phosphorus and calcium two levels each were studied in a mixed confounded factorial experimnt , in randomised Block design.ThesisItem Open Access Studies on the performance of five varieties of cowpea (Vigna sinencis Savi.) and their response to nitrogen and phosphate fertilization(Division of Agronomy, Agricultural college & reseach institute Vellayani, Trivandrum, 1966) Ravindran Nair, R; KAU; George, C MA field experiment was laid out in the farm attached to the agricultural college and research , Vellayani, during 1965-66 to study the effect of nitrogen and phosphate fertilization on five varieties of cowpea and to determine the best variety, suited to the local conditions . The varieties tried were , new era, M.S .9314, African, C4 and the local. The fertilizer treatments comprised two levels of nitrogen , vis, 0,30,60 and 90 kg./ha.ThesisItem Open Access Effect of phospherus nutrition liming and rhizobial inculation on soybean(Department of Agronomy, College of Horticulture, Vellanikkara, 1979) Kurian, T M; KAU; Vikraman, RAn experiment was conducted at the Instructional Farm attached to the College of Horticulture, Vellanikkara during July to October 1978, to study the effect of phosphorus nutrition, liming and rhizobial inoculation on soybean (Glycine max (L.) Merril). The investigation was taken up with the objective of arriving at the phosphorus requirement of the crop, assessing the response to liming and evaluating the effect of rhizobial inoculation. The trial was also aimed at studying the possible interaction effects between these factors. The experiment was laid out as a factorial in randomized block design with 16 treatments and 3 replications. The study revealed that applied phosphorus did not significantly affect any of the growth characters consistently. Grain yield and yield attributes were also unaffected but stover yield increased with higher doses of applied phosphorus. In general, nitrogen, phosphorus and calcium contents in plant components were unaffected by levels of phosphorus, liming and rhizobial inoculation. Uptake of these nutrients also remained almost unchanged. At harvest, nitrogen uptake by seeds constituted 44 per cent of the total, remaining being accumulated in stem + petiole and shell. In the case of phosphorus, 86.9 per cent of the total accumulation was in seeds, 6.0 percent and 7.1 per cent being in stem + petiole and shell respectively. Calcium being an immobile nutrient and an element not translocated within the plant, proportion of uptake of calcium in various components of the plant was different from that of nitrogen and phosphorus. In contrast to nitrogen and phosphorus, only 24.9 per cent of the total was found in seeds whereas 36.3 per cent and 38.8 per cent of it were concentrated in stem + petiole and shell respectively. Levels of phosphorus, had no effect on total nitrogen and available potassium contents of soil after harvest of the crop but there was a notable increase in available phosphorus and decrease in exchangeable calcium. Liming and rhizobial inoculation did not have any conspicuous effect on the content of nutrients in soil.ThesisItem Open Access Response of modern varities of rice to nitrogen in kole lands(Department of Agronomy, College of Horticulture, Vellanikkara, 1987) Premkumar, J; KAU; Sreedharan, CAn experiment was carried out in Kole lands during the Kole season of 1985 (December-January to March-April) to ascertain and compare the nutritional requirement of short duration rice varieties and pre – release culture 10-1-1. The treatments consisted of factorial combination of 3 varieties ( Jyothi, Culture 10-1-1 and Triveni) and 5 levels of nitrogen (50,70,90,110 and 130kg N ha-1) in Randomised Block Design, replicated thrice. It was found that the pre-release Culture 10-1-1 had significantly higher plant height, tiller number, leaf area index, dry matter production, number of panicles per m2 and thousand grain weight over other varieties. Triveni recorded the highest filled grains per panicle and weight per panicle. There was no variation in grain yield among the cultivars tested. Culture 10-1-1 registered the highest straw yield and nutrient uptake. Culture 10-1-1 also recorded the highest net income over the varieties tested. Application of nitrogen increased the vegetative characters and yield attributes of rice viz., plant height, tiller production, number of panicles per m2, panicle length, panicle weight, filled grains per panicle and thousand grain weight. The highest grain yield and net income was obtained by Jyothi at 110 kg N ha-1 and that for culture 10-1-1 and Triveni at 90 kg N ha-1. Straw yield and dry matter production were increased upto 110 kg N ha-1. The uptake of nutrients were also influenced positively by nitrogen fertilization. The per day production of Jyothi, culture 10-1-1 and Triveni was found to be 42.65, 51.63 and 49.88 kg, respectively at 90 kg N ha-1. The present investigation revealed that the optimum level of nitrogen fertilization to be 103.74, 97.48 and 93.07 kg ha-1 for Jyothi, Culture 10-1-1 and Triveni, respectively. It was also observed that the field duration of culture 10-1-1 was only 77 days compared to that of 79 and 91 days of Triveni and Jyothi respectively. Benefit cost ratio was highest for Culture 10-1-1 thus indicating the scope of popularizing this cultivar as a short duration variety in Kole land.ThesisItem Open Access Slow release nitrogen in cassava nutrition(Department of Agronomy, College of Agriculture, Vellayani, 1988) Vinod, G S; KAU; Muraleedharan nair, VAn investigation was undertaken at the College of Agriculture, Vellayani during the year 1985-86 to study the effect of slow-release nitrogen sources on cassava. The variety used for the trail was Sree Visakha. The treatments consisted of four sources namely urea, neemcake coated urea, urea super granule and rubber cake coated urea each at five levels of nitrogen (50, 75, 100, 125 and 150 kg/ha). The experiment was laid out in a 4 x 5 rectangular lattice design with three replications. Application of slow release sources of nitrogen like urea super granule and neem cake coated urea enhanced the growth characters of tapioca such as plant height, number of functional leaves, number of nodes and the leaf area index. Higher levels of nitrogen gave better results in the growth characters. The highest number of tubers, maximum tuber weight and the highest tuber yield were recorded by the urea super granule application, followed by neem cake coated urea. Among the levels of nitrogen tried, the level 150 kg/ha gave the highest yield. Starch content, crude protein content and the hydrocyanic acid contents were not affected by the slow-release source of nitrogen while higher levels of nitrogen application increased the hydrocyanic acid content and the crude protein content. Urea super granule recorded the highest nitrogen uptake and potassium uptake followed by neem cake coated urea. There was no significant difference in the total nitrogen content of the soil with the use of slor-release sources of nitrogen. The treatment combination of neem coated urea tried at 150 kg N/ha resulted in the maximum net return. Though urea super granule gave the maximum yield its cost of cultivation was higher than that of the other sources. So it is more economical to use neem cake coated urea than urea super granule. So in general, the slow-release sources of nitrogn like urea super granule and neem cake coated urea resulted in a better performance than prilled urea.
