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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.ThesisItem Open Access Crop geometry studies in tapioca based intercropping system(Department of Agronomy, College of Agriculture, Vellayani, 1984) Anilkumar, A S; KAU; Sasidhar, V KAn experiment was conducted at the College of Agriculture, Vellayani, during 1982-83 to study the effect of intercropping groundnut and cowpea with tapioca and to identify the most suitable spatial arrangement of crops in the tapioca and to identify the most suitable spatial arrangement of crops in the tapioca based intercropping system. The study also helped to find out the possibilities of changing the geometry of planting of tapioca from the normal method to the paired row pattern. The experiment with eight treatments was carried out in randomised block design with three replications under rainfed conditions.ThesisItem Open Access Studies on the interactive effects of water regimes, weed control treatments and nitrogen levels in direct-seeded rice(Faculty of the Post-Graduate School, Indian Agricultural Research Institute, New Delhi, 1984) Mohan Kumar, B; KAU; Singh, K NField and green house experiments were conducted in the Division of Agronomy, Indian Agricultural Research Institute, New Delhi, during 1982 and 1983 to study the interaction of nitrogen x weed control x water regimes, on the growth, productivity and nutrient use pattern of direct seeded rice. The treatments in the field trails consisted of 4 levels of nitrogen (0, 50, 100 and 150 kg N ha-1). 3 weed control treatments (weedy check, butachlor, bentazone in 1982 and bentazone plus propanil in 1983) and 2 water regimes (continuously and intermittently flooded). The experiment was laid out in a split plot design, replicated thrice. The variables in the green house experiment were 2 rice cultivars (Pusa 33, drought susceptible and Pusa 312, drought tolerant), 3 nitrogen levels (0,100 and 200 mg N kg soil-1) and 5 soil moisture regimes (submergence to saturation, 0-0.025 MPa, 0-0.05 MPa, 0-0.075 MPa 0-0.10 MPa soil moisture tension).ThesisItem Open Access Nutritional requirement for horsogram (Dolichos biflorus Roxb.)(Department of Agronomy, College of Agriculture, Vellayani, 1984) Kumari Swadija, O; KAU; Chandrasekharan, PA field experiment was conducted at the college of Agriculture, Vellayani during 1932 to study the effect of three levels each of nitrogen (0.15 and 30 kg/ha), phosphorus (0. 25 and 50 kg P2Os/ha) and potassium (0.20 and 40 k2O/ha) on growth, yield and quality of horsegram. The trial was conducted as a 3 partially confounded factorial experiment with two replications. Application of nitrogen phosphorus and potassium had profound influence on all growth characters like height of plant* number of functional leaves and branches per plant and leaf area index. The highest nodule count was obtained by the application of 15 kg N 25 kg Pg 5 and 20 kg KO per hectare while tho dry weight of nodules per plant was maximum at 15 kg N 50 kg 40 kg K2O per hectareThesisItem Open Access Water management practices for bittergourd (Momordica charantia L.) under different fertility levels(Department of Agronomy, College of Agriculture, Vellayani, 1984) George Thomas, C; KAU; Raveendranathan Pillai, GAn experiment was conducted at the Agronomic Research station, Chalakudy during 1932-83 summer season to study the response of bibtergourd (Momordlca charantia L.) to different water management practices and fertility levels. The treatments consisted of four levels of irrigation (irrigation at IW/CPE ratios of 0.4# 0.08 and 1.2 and the farmers practice) and three fertility levels (Farmyard manure (FYM) 18 t ha FIM 18 th NPK 30 > 15 o 30 kg ha"1 and FYM 18 t + UPK 60 * 30 t 60 kg ha"1) • The experiment was laid out as a factorial experiment in randomised block design 'with three replications. The study revealed that bittergourd responded well to frequent irrigations and higher levels of fertilisers. Biometric characters like leaf area index and dry matter production and yield contributing characters like mean number of fruits per plant mean length of fruit and mean weight of fruit wore favourably influenced by frequent irrigations and higher levels of fertilizers. Total fruit yields were also higher in frequently irrigated and well fertilised plots.ThesisItem Open Access Nutritional requirements of winged bean [Psophocarpus tetragonolobus(L.)DC. ](Department of Agronomy, College of Agriculture, Vellayani, 1984) Brillin, C; KAU; Pushpangadan, KAn experiment was conducted in the Instructional Farm attached to the College of Agriculture, Vellayani during 1982 - 1983 to study the effect of four levels of phosphorus (0, 30, 60 and 90 kg PgO^/ha) and three levels each of nitrogen (0, 15 and 30 kg/ha) and potassium (0, 30 and 60 kg K20/ha) on growth, yield, quality, uptake and chemical composition of the plant parts in winged bean (Psophocarpus tetragonolobus (L.)BC.) The field trial was laid out as a 4 x 3^ confounded factorial experiment confounding and higher order interactions in both the replications.ThesisItem Open Access Efficiency of azolla for weed control in rice ecosystem(Department of Agronomy, College of Agriculture, Vellayani, 1984) Madhava, Chandran K; KAU; Sreedharan, CAn experiment was conducted in sandy soils of the Agronomic Research Station, Chalakudy during the first crop season (Kharif) of 1982. The efficiency of azolla for weed control in rice ecosystem was investigated in order to find out a suitable alternative to the traditional weed control methods used in rice cultureThesisItem Open Access Effect of techniques on soil loss, surface runoff and soil moisture storage in hill slopes- Part II(Department of Agronomy, College of Agriculture, Vellanikkara, 1984) Ajith, Kumar Menon; KAU; Sasidhar, V KA field experiment was conducted at the Instructional Farm, Vellanikkara during June 1981 to February 1982, to study the effect of various Agro-Techniques on soil loss, surface runoff and soil moisture storage in hill slopes. The experiment was conducted with the main objective of studying the effect of cowpea intercropping as well as the different methods of planting of tapioca on reducing soil and water loss in hill slopes. The experiment was laid out in Randomised Block Design with seven treatments and three replications. The treatments consisted of (1) tapioca alone in ridges along the slope, (2) uncultivated bare fellow as a control, (3) tapioca in ridges along the slope with cowpea as intercrop, (4) tapioca in ridges across the slope with cowpea as intercrop, (5) tapioca alone in mounds, (6) tapioca alone in ridges across the slope and (7) tapioca in mounds with cowpea as intercrops. The experiment was conducted in field runoff plots of 24.3 m x 2.7 m size. The runoff from the field were collected directly into water proof polythene lined earthen tanks and measured after each rainfall. From the experiment it is observed that total rainfall was better correlated with runoff and soil loss followed by average intensity. Maximum runoff and soil loss occurred in plots with tapioca alone in ridges along the slope. Cowpea intercropping as well as tapioca planting in ridges across the slope were effective in reducing soil and water losses. Tapioca alone in ridges along the slop recorded the maximum losses of N, P and K being 131.29 kg, 41.44 kg and 124.63 kg/ha respectively. Maximum retention of rainfall was recorded the tapioca in ridges across the slope with cowpea as intercrop. The pH and conductivity of runoff water were not significantly influenced by different treatments. During the dry periods maximum storage and thereby minimum depletion of moisture in 30-45 cm soil layer were recorded by uncultivated bare fallow plot. The treatment with tapioca alone in ridges across the slope recorded greater height of plants, more number of functional leaves per plant, maximum length of tubers and highest yield of tubers. The biometric characters and yield of the intercropped cowpea were not affected by various cultivation methods of tapioca.