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ThesisItem Open Access Shade response of common rainfed intercrops of coconut(Department of Agronomy, College of Horticulture, Vellanikkara, 1981) Lalitha Bai, E K; KAU; Vikraman, RAn experiment was conducted at the College of Horticulture, Vellanikkara during 1980-81 to study the shade response of five common rainfed intercrop of coconut garden. The experiment was laid out in randomised block design with four levels of shade and five replications. The study revealed that sweet potato cannot be cultivated under shade as it is a ‘shade –sensitive’ crop,while coleus is suitable only where light infiltration is high. Colocasia, turmeric and ginger were found suitable for intercropped situations. Colocasia appears to be shade – tolerant while ginger and turmeric are indicated as ; shade – loving’. These two shade – loving crops are best suited under shaded situations up to 25 and 50 per cent shade, respectively . Photosynthetic mechanism appears to have a decisive role on the shade response of all these crops expecting sweet potato. Excepting colocasia, plant height (length of vine) in all the crops increased with increasing shade intensities. Number of branches (tillers) in all the crops significantly decreased with increasing intensities of shade. The content of total chlorophyll and its components were significantly influenced by shading in all the crop. The contents of nitrogen, phosphorus and potassium in all the plant components of all crops increased because of shading. The uptake of all the nutrients followed an identical pattern as that of dry matter accumulation in all the crops.ThesisItem Open Access Effect of shade and moisture regimes on the growth of cocoa seedlings(Department of Agronomy, College of Horticulture, Vellanikkara, 1981) Gopinathan, R; KAU; Vikraman Nair, RAn experiment was conducted at the College of Horticulture, Vellanikkara during 1979-80 on the effect of shade and moisture regimes on the growth of cocoa Theobroma cacao L.) seedlings. The investigations were carried out to arrive at the optimum shade and moisture requirement for the growth of cocoa seedlings. The experiment was laid out in a completely randomised design with four levels of shade and three levels of moisture with four replications. The study revealed that cocoa seedlings must be shaded and well watered for their better growth. 50 – 55% shade and irrigation at 75% available moisture was found best. Death of all the seedlings in the open by the third month of observation stresses that, cocoa seedlings cannot be grown without any shade irrespective of the frequency of irrigation. Expect net assimilation rate (NAR) and leaf area ratio (LAR) all the growth characters were increasing with increasing shade (up to 50 – 55%) and increasing frequencies of irrigation.ThesisItem Open Access Spacing cum fertilizer investigation on rice variety, Mashuri, in the Onattukara tract(Department of Agronomy, College of Agriculture, Vellayani, 1983) Sobhana, S; KAU; Chandrasekharan, PWith a view to investigate the influence of different fertilizer levels, spacings and their combinations on the growth and yield of rice variety, Mashuri, in the sandy loam tracts of Onattukara, an experiment was conducted at the Rice Research Station, Kayamkulam, during the second crop season of the year, 1981-82. The response of the variety to four fertilizer levels (50 : 25 : 25, 60:30:30, 70:35:35 and 80:40:40 kg/ha NPK), four spacings (10cm X 5 cm, 10cm x 10 cm, 15 cm x 10 cm and 20 cm x 1o cm) and their combinations was studied. The experiment was laid out in randomised block design , as a 4 x 4 factorial experiment with three replications.ThesisItem Open Access Shade tolerance of guinea grass var. mackuenii under different levels of potassium(Department of Agronomy, College of Agriculture, Vellayani, 1982) Mullakoya, P; KAU; Raghavan Pillai, GAn investigation was carried out in the Instructional Farm attached to the College of Agriculture, Vellayani, during 1981-82 with the objective to assess the production potential of guinea grass var. Mackuenii under varying intensities of shade. It was also aimed to assess the potassium requirement was laid out in a 4 x 4 factorial randomised block design with 3 replications. The results of the study are summarised below: (1) Height of grass was positively influenced by both shade intensities and potash levels. (2) Leaf area of grass was increased with increase in shade intensities and potash levels. (3) Tiller production was adversely affected by shade, while potash application increased tiller number of grasses.ThesisItem Open Access Potash nutrition of tapioca (Manihot esculenta Crantz.)(Department of Agronomy, College of Agriculture, Vellayani, 1982) Muraleedharan Nair, V; KAU; Sadanandan, NAn investigation was undertaken at the College of Agriculture, Vellayani and Rice Research Station, Kayamkulam for two years during 1977-79 to study the performance of tapioca (Var. Sree Sahya) under two different agroclimatic conditions. The treatments consisted of three levels of nitrogen (50, 125 and 200 kg N/ha) and three levels of potassium (50,125 and 200 kg K2O/ha) at three times of application. The experiment was laid out in a 3 partially confounded factorial design with two replications.ThesisItem Open Access Seed production of potential Stylosanthes gracilis(Department of Agronomy, College of Agriculture, Vellayani, 1981) Lekha Sreekantan; Madhavan Nair, K PFactorial experiment in Randomised Block Design with three replications was conducted in the College of Agriculture, Vellayani to study the effect of levels and methods of phosphorus application and number of cuts of green fodder taken, on the seed production potential of Stylosanthes gracilis. The phosphorus treatments were 40, 80 and 120 kg P2O5/ha as soil applications, 40 kg P2O5/ha as soil application + 40 kgP2O5/ha foliar and 80 kg P2O5/ha soil application+ 40 kg P2O5/ha foliar. The cutting treatments were two, three or four cuts. Increasing the level of soil applied phosphorus significantly increased height, spread, leaf stem ratio, nodular weight and number, greenmatter and drymatter yields in each cut and the cumulative greenmatter and drymatter yields.ThesisItem Open Access Nutritional management in coleus (Coleus parviflorus Benth)(Department of Agronomy, College of Agriculture, Vellayani, 1983) Geetha, K; KAU; Madhavan Nair, K PAn experiment was conducted at the College of Agriculture, Vellayani with the objective of finding out the optimum doses of nitrogen and potash tried were 0, 30, 60,90 and 120 kg/ha each. The two timings tried were entire dose as basal, and half basal and half thirty days after planting. Nitrogen had significant effect on plant height, number of branches, number of functional leaves, plant spread and leaf area index whereas levels of potash had not much effect on these aspects except at early stage. Time of application of nutrients had no effect on these growth characters.ThesisItem Open Access Influence of the method of application of N and P on the growth, yield and quality of blackgram [Vigna mungo (L.) Hepper](Department of Agronomy, College of Agriculture, Vellayani, 1983) Elizabeth, K Syriac; KAU; Chandrasekharan, PAn experiment was conducted in the rice follows of the Rice Research Station, Kayamkulam during the summer season of 1981-82 to study the influence of the method of application (Soil and foliar) of N and P on the growth, yield and quality of blackgram. The experiment was laid out in Randomised Block Design with fifteen treatments replicated thrice. The study revealed that the height of the plant at the last three stages of crop growth was significantly influenced by the combined application of N and P, partly through soil and partly through foliage. At one stage alone the number of leaves per plant and leaf area index were significantly affected by the application of N and P combination partly through soil partly through foliage.ThesisItem Open Access Fertilizer management trail for the rice variety mashuri during mundakan season(Department of Agronomy, College of Agriculture, Vellayani, 1984) Ajith Kumar, R; KAU; Muraleedharan Nair, VWith a view to investigate the response of the rice variety Mashuri to fertilizer levels and time of nitrogen application, a field experiment was conducted at the Regional Agricultural Resaerch Station , Pattambi, during the second crop season of 1982-83 . The treatments consisted of seven nutrient levels (70:45:45, 70:35:35, 60:35:35 60:25:25, 50:35:35 and 0:0:0 KG NPK per hectare) and three times of application of nitrogen (50% as basal+ 25% 20 DAT+ 25% 40 DAT, 25% as basal + 50% 20 DAT+25% 40 DAT and 25% as basal + 25 % 20 DAT + 50% 40 DAT) and their various combinations. The experiment was laid out in split-plot design with levels of fertilizers in main plot and times of application of nitrogen in sub plot with three replication.