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Item Response of cassava to irrigation under pure and mixed stands(Kerala Agricultural University, 1986) Kuruvilla Varughese; Jose Mathew; Pillai, G RAfield experiment was conducted for two consecutive years in the sandy loam soil of the Agronomic Research Station, Chalakudy to study the effect of different irrigation schedules (0.3, 0.6 and 09 IW/CPE ratios) on the growth and yield of cassava under pure and mixed stands (cassava (M 4) alone and cassava intercropped with groundnut (TMV 2), cowpea (V 16), greengram (ML 26), and blackgram (T 9). It was revealed that under shallow water table conditions cassava requires irrigation only at IW/CPE ratio of 0.3 (approximately once in 37 days in the dry period) both under pure and mixed stands. It was also observed that cultivation of intercrops viz., greengram, cowpea, blackgram and groundnut gave additional income from the same piece of land without adversely affecting the yield of cassava.Item Response of blackgram to different levels of irrigation in summer rice fallows(Kerala Agricultural University, 1986) Kuruvilla Varughese; Jose Mathew; Pillai, G RStudies conducted at the Agronomic Research Station, Chalakudy revealed that the grain yield of blackgram grown in rice fallows during summer was significantly influenced by water management practices. Irrigating the crop at an IW/CPE of 0.5 was found to be the best. The ratios of 0.75 and 0.5 and bellshaped irrigation recorded 105, 107 and 109 per cent increase in grain yield over no irrigation control. It was also observed that both the varieties tried viz., T9 and Co 2 were on par in all the three seasons.Item Response of chickpea (Cicetarietirum L.) to soil and foliar application of diammonium phosphate(Kerala Agricultural University, 1987) Kuruvilla Varughese; Pathak, S SItem Optimising the irrigation water requirement of cassava(Kerala Agricultural University, 1988) Jose Mathew; Kuruvilla Varughese; Pillai, G R; Santhakumari, GA two year study was undertaken at the'Agronomic Research Station, Chalakudy during 1982-'83 and 1983-'84 to formulate a suitable water management schedule which optimises the irrigation water requirement of cassava planted during November- December months. Tha trial consisted of 12 irrigation treatments (unirrigated and irrigated at 75 mm and 100mm CPE, through all furrows and alternate furrows and with varying quantities of irrigation water (Recommended (50 mm) and its 3/4 and 1/2 depths) in different combinations. Two treatments having the added advantages of economy in water and labour viz., (i) All furrow irrigation with 1 /2 water (25 mm) at 100 mm CPE and (ii) Alternate furrow irrigation alternatively with 25 mm water at 75 mm CPE were identified, the first schedule approximately requires seven irrigations at an interval of 27 days whereas thjsacond schedule requires nine irrigations at an interval of 20 days.Item Effect of irrigation and mulching oh the growth and yield of pineapple (Ananas Comosus L.)(Kerala Agricultural University, 1988) Kuruvilla Varughese; Pillai, G R; Jose Mathew; Santhakumari, G; Gopi, C SA field experiment was conducted in a sandy loam soil of the Agronomic Research Station, Chalakudy, Kerala for four years from 1981 to 1985 to study the response of irrigation and mulching on tha growth and yield of pineapple. Both irrigation and mulching influenced the fruit yield significantly. The study revealed that irrigating pineapple during summer months at 0.6 IW/CPE ratio (5 cm depth of water) and mulching the crop with dry leaves @6000 kg/ha was optimum. It requires fivato six irrigations during the dry months at an interval of 22 days.Item Irrigation and mulching in nendran banana(Kerala Agricultural University, 1989) Pillai, G R; Kuruvilla Varughese; Jose Mathew; Santhakumari, GItem Response of sesamum to water management practices under varying levels of nitrogen(Kerala Agricultural University, 1989) Jose Mathew; Kuruvilla Varughese; Pillai, G R; Santhakumari, GA field experiment on sesamum (Sesamum indicum) with five water management practices (No irrigation and irrigation at 0.25, 0.50 and 0.75 IW/CPE ratios and at critical stages of 3-4 leaf stage, branching, flowering and pod formation) and four nitrogen levels (0, 15, 30 and 45 kg N/ha) was conducted in the sandy loam soil of the Agronomic Research Station, Chalakudy during the three summer seasons of 1983, 1985 and 1986. Irrigating sesamum with 40 mm water at the critical stages of 3 - 4 leaf stage, branching, flowering and pod formation or at 0.75 IW/CPE ratio (at an approximate interval of 13 days) resulted in significant higher grain yield as compared to unirrigated or less frequently irrigated crops. The response to nitrogen application up to 45 kg/ha was linear in nature having no interaction effect with water management practices. However, the yields of grain at 30 and 45 kg/ha of nitrogen were comparable.Item Response of cowpea to irrigation and phosphorus(Kerala Agricultural University, 1994) Santhakumari, G; Pillai, G R; Kuruvilla Varughese; Jose MathewInvestigations carried out in the rice fallows of the Agronomic Research Station, Chalakudy revealed that grain and green pod yields of cowpoa variety Kanakamani were significantly increased by irrigation and application of phosphorus. Irrigation at critical stages of branching, flowering and pod formation and irrigation at 1W/CPE = 0.75 were better schedules for the production of grain and green pods. The economic optimum dose of phosphorus was worked out to 30.0 and 36.8 kg P2C>5 ha for the production of grain and green pods, respectively.Item Irrigation management on yield stabilization and annual productivity of coconut(Kerala Agricultural University, 1996) Jose Mathew; Piilai, G R; Santhakumari, G; Kuruvilla VarugheseThe impact of irrigation water management, with the treatments linked to climatic parameters, in coconut on inter-harvest yield variation and annual productivity was studied in a five-year field experiment.Yields got stabilized with adequate irrigation showing minimum fluctuation among harvests during different periods of the year.The data on per cent contribution of individual harvests, standard deviation, yield range between harvests and coefficient of variation clearly supported this argument. Based on yield trends and irrigation water consumption, irrigation at 50 mm CPE with 50 mm water was suggested as the best schedule for irrigating coconut during dry spell.Item Influence of summer cropping and fallowing on fertilizer use efficiency and productivity of rice(Kerala Agricultural University, 1996) Jose Mathew; Reena Mathew; Kuruvilla Varughese; Santhakumari, G; Pillai, G R