Browsing by Author "Madhavan Nair, K P"

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    Effect of N and K in coleus
    (Kerala Agricultural University, 1993) Geetha, K; Madhavan Nair, K P
    The effect of N and K and their lime of application in coleus revealed that N at the rate of 60 kg/ha was sufficient to produce higher tuber yield, high dry matter yield, maximum bulking rate and maximum utilisation index. Highest yield of tuber and highest dry matter yield per ha were obtained at the rate of 120kg foO/ha. Split application of nutrients was found to be the best method for obtaining higher weight of marketable tubers, higher tuber yield per plant, maximum dry matter yield and highest tuber yield.
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    Effect of seed size and fertility levels on the yield and quality of Dioscorea esculenta (Lour) Burk
    (Department of Agronomy, College of Agriculture, Vellayani, 1985) Sasidharan Nair, R C; Madhavan Nair, K P
    An experiment was conducted at the Krishi Yigyan Kendra, Mitraniketan, Vellanad, Trivandrum District, with the objective, of finding out the optimum seed else and fertilizer dose to Dioscorea esculenta. The seed sizes of 50 g, 70 g, 90 g, 110 g and 150 g with a variation of - 10 g and fertilizer levels of 60 : 60 : 90, 8O : 80 : 120 and 100 : 100 : 150 kg NPK/ha wore tried in a factorial randomised block design with three replications. The seed size of 150 g was found to be superior In increasing the germination percentage, and growth characters such as length of vine, number of leaves per plant, LAI The yield attributes such as number and weight of tubers, number and weight of marketable tubers, length and girth of tubers, total tuber yield/ha, tuber bulking rate, utilization index and dry matter production were also found significantly higher in plants developed from seed sizes of 150 g. The fertilizer levels had no influence on growth characters, yield attributes and yield. The protein content of tho tuber increased significantly by the application of 100 s 100 s 150 kg EJPK/ha, while the starch and sugar content increased to the maximum by the 60 : 60 : 90 kg NPK/ha. (The seed else had no influence on any of the quality characters. Crude fibre was not affected by seed sizes or fertilizer level. Uptake of nitrogen, phosphorus and potassium were influenced by the seed size of 150 g during all stages of growth. She highest fertilizer level influenced the uptake of nitrogen during all stages of growth while uptake of phosphorus was not at all affected by the fertilizer level.In general fertilizer levels had no effect on the uptake of potassium
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    Integrated weed management in transplanted medium duration rice
    (Department of Agronomy, College of Agriculture, Vellayani, 1987) Beena Maheswari, S K; Madhavan Nair, K P
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    Nutritional management in Coleus (Coleus parviflorus Benth)
    (Department of Agronomy, College of Agriculture, Vellayani, 1983) Geetha, K; Madhavan Nair, K P
    An 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.
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    Nutritional requirement of black gram {Vigna mungo (L) Hepper}
    (Department of Agronomy, College of Agriculture, Vellayani, 1980) Annamma George; Madhavan Nair, K P
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    Nutritional requirement of green gram (Vigna radiata (L.) Wilczek
    (Department of Agronomy, College of Agriculture, Vellayani, 1980) Savithri, K E; Madhavan Nair, K P
    An experiment was conducted In the Instructional Farm, College of Agriculture, Vellayni during 1979 to study the effect of three levels in each of nitrogen (20, 30 and 40 kg/ha), phosphorus (30, 45 end 60 kg/ha) and potash (10, 20 and 50 kg/ha) on growth, yield and quality of green gram (Vlgna radiata) grown in rice fallows. The experiment was laid out as 3 partially confounded factorial experiment with two replications, confounding NPK in replication I and NPK2 in replication II Tho study revealed that nitrogen, phosphorus and potash had on influence on height and number of leaves, but not on nodulatlon. The yield contributing factors sanely number of flowers sad number of pods per plant, length of pod and number of seeds per pod ware not influenced by the treatments, Weight of seeds per plant was significantly increased by the highest level of potash and 100 seed weight by higher levels of phosphorus, while highest level of nitrogen significantly decreased tho 100 seed weight. Maximum grain yield of 538 kg/ha was obtained with the highest level of potash.Dry natter yield was also influenced by potash and bhusa yield by nitrogen.
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    Production potential of two fodder grasses under different management practices
    (Department of Agronomy, College of Agriculture, Vellayani, 1986) Raghavan Pillai, G; Madhavan Nair, K P
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    Relative efficiency of different herbicides on rice under semi dry conditions
    (Kerala Agricultural University, 1979) Balachandran Nair, G K; Balakrishna Pillai, P; Madhavan Nair, K P; Sasidhar, V K
    The findings of the present investigation reveal that amongst different weed control measures tried the application of propanil (Stam F — 34) in combination with 2, 4 — D (Feronoxone) at the rate of 0.75 and 0.5 kg. a. i/ha respectively, followed by propanil (Stam F — 34) alone at the rate of 1.5 kg. a.i/ha and Butachlor (Machete) alone at the rate of 1.5kg. a.i/ha are beneficial in controlling weeds and improving grain yields of rice.
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    Response of groundnut (Arashis hypogaea (L.) to phosphorus and potassium under different water management practices
    (Department of Agronomy, College of Agriculture, Vellayani, 1981) Jose Mathew; Madhavan Nair, K P
    The study revealed tho favourable Influence of frequent irrigations on growth characters like pleat height, number of branches end loaves per plant, MI, dry matter production per pleat sad number sad dry weight of nodules par plant end through these characters, haulm yield. The yield end yield attributes also showed a significant increase at higher levels of irrigation. The highest yield of 2533 kg/ha was obtained by scheduling irrigation at 0.9 1H/GPS ratio. In general a decrease in phosphorus content could- be observed at higher levels of irrigation. Frequent irrigations helped to increase oil content, oil yield end kernel protein yield par hectare. In general, the nitrogen end potassium content in tho plant parts were less affected by irrigation. More frequent irrigations had increased nitrogen. Phosphorus and potsssium uptake by the crop
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    Seed production of potential stylosanthes gracilis
    (Department of Agronomy, College of Agriculture, Vellayani, 1981) Lekha Sreekantan; Madhavan Nair, K P
    Factorial 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.
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    Studies on the critical periods of weed infestation and effect of weed growth on yield and quality of a short duration rice
    (Department of Agronomy, College of Agriculture, Vellayani, 1978) Abraham Varughese; Madhavan Nair, K P
    An experiment was conducted at the Instructional Farm of the College of Agriculture, Vellayani, Kerala Agriculture University during the second crop season, 1976-77 to study the critical periods of used infestation and effect of weed growth on the yield and quality of a duration rice ver. Triveni Simple randomised block design was adopted with 17 treatments. Band weeding was done to keep weed free conditions of 10,20 and 30 day intervals upto 60th day and for 1-60 days after transplanting. The above weed free periods with one unweeded control formed the 17 treatments.
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    Weed control method for semi-dry dibbled crop of rice
    (Department of Agronomy, College of Agriculture, Vellayani, 1983) Lakshmi, S; Madhavan Nair, K P
    An experiment was. conducted at the nice Research station of Kerala Agricultural university at Kayamkulam during, the Virippu (first crop) season of 1981-82 to find out a suitable weed control method for semi-dry dibbled crop of rice, in simple randomised block design with 7 herbicide treatments. 4 hand weeding treatments of which one was the local practice and another unweeded control. Monocot weeds were found to be better competitors than dicot weeds. Heed population was maximum during the first 40 days of dibbling. The herbicides reduced weed population and dry matter accumulation compared to hand weeded plots and increased the weed control efficiency. All the crop growth characters like plant height tiller count and LAI were Influenced favourably by the application of herbicides compared to hand weeding. Yield attributing factors like number of productive tillers/hill, length of the panicle, weight of the panicle and number of filled grains per panicle were adversely influenced by competition with weeds and control of weeds by the use of herbicides like benthiocarb 2.0 kg ai/ha and nitrofen 1.975 kg ai/ha increased the yieldattributing character® which was reflected on the grain and straw yield.
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    Weed management in rice based cropping system
    (Department of Agronomy, College of Horticulture, Vellayani, 1988) Soman, P S; Madhavan Nair, K P
    A field experiment was undertaken at the College of Agriculture, Vellayani, to find out a scientific and profitable weed management techniques for a Rice – Rice Cropping System, under transplanted condition during the Virippu – Mundakan seasons of 1984 – 85. The first crop with five herbicides (thiobencarb 1.5 kg, butachlor 1.0 kg, pendimethlin 1.0 kg, nitrofen 1.875 kg and fluchloralin 1.0 kg a.i. per ha) and three controls (hand weeding, completely weed free and weedy check) was laid out in RBD. Using the same lay out, in the second crop, each herbicide treated main plots was divided in to three sub plots and allotted no weeding, hand weeding and same herbicide treatments and the results analysed as that of a split plot with non – factorial structure. The salient findings of the experiments are as follows. Firsr Crop Weed number and competition was severe upto the 40th DT and monocots out numbered dicots. Nitrofen and thiobencarb reduced weed population, weed dry matter accumulation, nutrient removal by weeds and achieved high Weed Control Efficiency than hand weeding. Nitrofen and thiobencarb improved plant growth characters, enhanced yield components, increased grain and straw yield and accelerated nutrient uptake, followed by butachlor. These herbicides recorded low weed Index values. Application of thiobencarb, butachlor or nitrofen was more profitable than hand weeding twice. Second Crop There was no shift in weed species due to herbicides. Weed number and competition were severe upto the 40th DT and monocot weed population was higher than dicots. Though there was a general reduction in the population and dry matter of weeds due to herbicide application of first crop, their residual effect was not enough to keep the field unweeded during the second crop season. Weed number, weed dry matter and nutrient removal by weeds were reduced by the repeated application of thiobencarb or nitrofen or these herbicides – hand weeding combinations, They recorded Weed Control Efficiency of more than 62 percent. Plant growth characters, yield components, grain and straw yield, and nutrient uptake by the crop were favourably influenced by the above herbicides in combination with hand weeding or when repeatedly applied equal to or better than farmers practice of hand weeding. They recorded low values of weed indices. The residual effect of herbicides applied in the first crop was not significant in the above characters. Thousand grain weight and protin content were not influenced by the treatments. In the system approach, highest total grain yield was produced by thiobencarb –hand weeding, nitrofen – hand weeding and butachlor – hand weeding where as highest net profit was obtained by the repeated application of thiobencarb and butachlor. Herbicide residual toxicity was not observed to the succeeding cowpea crop.