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Item Production potential and economics on seven rice based crop rotations(Kerala Agricultural University, 1978) Balachandran Nair, G K; Sasidhar, V K; Santhakumari, GItem Response of nendran banana to different levels of N, P and K(Kerala Agricultural University, 1977) Pillai, G R; Balakrishnan, S; Veeraraghavan, P G; Santhakumari, G; Gopalakrishnan, RExperiments were conducted to study the response of nendran banana to different levels of N, P and K at the Banana & Pineapple Research Station, Kannara for five consecutive seasons from 1963 — 64. The results revealed that the nutrients N and K exerted a significant positive influence on fruit number and bunch weight. The optimum dose of N and K2O corresponding to maximum yield of fruit has been worked out as 191, and 301 g per plant respectively. The economic optimum dose according to to the prevailing market rate has been worked out as 133 and 260 g of N and KSO respectively per plant per year.Item 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 Response of amorphophallus to irrigation and mulching(Kerala Agricultural University, 1988) Jose Mathew; Kuruvilla Varghese; Pillai, G R; Santhakumari, GA study was undertaken in the sandy loam soil of the Agronomic Research Station, Chalakudy during 1933-'84 and 1984'85 to know the response of December January planted amorphophallus to irrigation and mulching. Four irrigation (no irrigation and irrigation at 0.3, 0.6 and 0.9 IW/CPE ratios) and four mulching (no mulching and mulching with dried leaves, paddy waste end coir dust) in factorial combinations constituted the treatments. From the results of the study, it was found that amorphophallus planted in December-January has to be irrigated at 0.9 IW/CPE ratio with 50 mm wator through furrows in summer season for higher corm production. It requires about 10 irrigations at an approximate interval of 12 days in non-rainy periods. The study also revealed the importance of mulching with organic waste materials like dried leaves, paddy wasta and coir dust in boosting corm yield in irrigated amorphophallus.Item Effect of copper and zinc on the nutrition of rice plant(Kerala Agricultural University, 1983) Sasidhar, V K; Hassan, M A; Santhakumari, GItem 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 winter rice to different water regimes and nitrogen levels(Kerala Agricultural University, 1990) Jose Mathew; Kuruvilla Varghese; Pillai, G R; Santhakumari, GA sutudy was conducted at the Agrnomic Research Station, Chalakudy for three consecutive winter (second crop) seasons from 1983-84 to 1985-86 to study the effect of different water regimes and nitrogen levels on the growhth and yield of short duration rice variety Triveni. Four water regimes (continuous submergence of 5±2 cm and 7Item 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.