Browsing by Author "Nair, K P M"

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    Competition for nutrients by rice and weeds
    (Kerala Agricultural University, 1986) Abraham Varghese; Nair, K P M
    In an experiment to study the crop weed competition for 3 major nutrients in a short duration rice, carried out at the College of Agriculture, Vellayani, it was found that in general competition for the three nutrients N, P and K was severe between 21-40 days after transplanting. Weed removal during 21 -30 days helped the crop to absorb more of the nutrients. The demand for the nutrients was in the order of K> N> P by crop and weed. The nutrient uptake by weed was negatively correlated with crop yield while the uptake by weed and crop were also negatively correlated.
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    Critical periods of weed competition in a short duration rice variety 'triveni'
    (Kerala Agricultural University, 1980) Abraham varughese; Nair, K P M
    In studies on the critical periods of crop-weed competition a in short duration rice variety 'Triveni,' carried out at the College of Agriculture, Vellayani, during the second crop season of 1976-77, it was found that the critical period of crop-weed competition lies between 21 and 40 days after transplanting. During i his period, the weed emergence and dry matter accumulation were maximum. At least a weed free condition of 21 -30 days in the critical period of 21-40 days, is essential to obtain good yields.
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    Crude protein content of guinea grass and component crops under different spacings
    (Kerala Agricultural University, 1979) Krishna Raj, P; Sadanandan, N; Nair, K P M; Sasidhar, V K
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    Economics of inter cropping in guinea grass (Panicum maximum J.)
    (Kerala Agricultural University, 1979) Krishnaraj, P; Sadanandan, N; Nair, K P M; Sasidhar, V K
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    Effect of different plant densities on sunflower varieties in red loam soils
    (Kerala Agricultural University, 1978) Salam, M A; Sadanandan, N; Nair, K P M; Mohamed Kunju, U
    An experiment was conducted at the College of Agriculture, Vellayani to study the effect of different spacings on the yield of sunflower varieties. The results revealed that closer spacing decreased the head diameter and number of seeds per head, but significantly increased the total yield of seed. Closer spacing of 30x20 cm gave a maximum yield of 2163.1 kg seeds per hectare. The varieties did not show any difference in yield potential.
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    Effect of different planting methods and seed sizes on the growth and yield of colocasia (Colocasia Esculenta (L.) Schott)
    (Kerala Agricultural University, 1981) Kamalam Joseph; Mohammed Kunju, U; Nair, K P M
    A field experiment was conducted during 1978-79 at the Agricultural College Farm, Vellayani, Kerala, to study the effect of different methods of planting (pit, ridge and furrow) and sizes of planting materials (small cormels of 15-25 g, size, medium cormels of 35-45 g size, large cornrts of 55-65 g size and corms of 60-70 g size) on the growth and yield of colocasia (Colocasia escufenta (L.) Schott. Among the different methods of planting, furrow method hastened germination and increased the plant height, leaf area, LAI, average weight of corm and total tuber yield. Among the different sizes of planting material, larger size' groups hastened germination and increased the plant height. Average corm weight and total tuber yield were the maximum in the case of medium sized cormels.
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    Effect of graded doses of N, P and K on the yield and quality of blackgram var. KM-1 grown in rice fallows
    (Kerala Agricultural University, 1981) Annamma George; Nair, K P M; Abdul Salam, M
    The field experiment conducted during the third crop season of 1978-79 in the rice fallows of Instructional Farm, College of Agriculture, Vellayani, Trivandrum to study the effect of three levels each of nitrogen {20,30 and 40 kg ha), phosphorus (30, 45 and 60 kg/ha) and potash (10,20 and 30 kg/ha) on the yield and quality of blackgram and economics of fertilizer application to blackgram variety KM-1 revealed that the grain yield was significantly increased by increase in the level of potash. The maximum grain yield of 1757 kg/ha was recorded at 30 kq K20/na. Though the levels of nutrients had no significant influence on protein content, grain protein yield was significantly increased with increase in the leve! of potash, giving the maximum grain protein yield of 410. 86 kg/ha with 30 kg K^O/ ha. The maximum net profit of Rs, 3693.30 was also obtained from the plot which received 30kg KaO/ha.
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    Effect of graded levels of phosphorus and potassium on nodulation of two varieties of groundnut (Arachis hypogaea L.)
    (Kerala Agricultural University, 1980) Purushothaman Nair, N; Sadanandan, N; Nair, K P M; Mohamed Kunju, U
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    Note on the effect of various herbicides on the yield and yield attributing characters of two high yielding varieties of rice
    (Kerala Agricultural University, 1978) Ravindran, C S; Nair, K P M; Sasidhar, V K
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    Nutrient removal by rice crop and weeds
    (Kerala Agricultural University, 1987) Lakshmi, S; Nair, K P M; Raghavan Pillai, G; Muraleedharan Nair, V
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    Nutritional requirement of green gram (Vigna Radiata (L.) Wilczek) grown in rice fallows
    (Kerala Agricultural University, 1981) Savithri, K E; Nair, K P M; Oommen, M; Abdul Salam, M
    A field experiment to study the effect of three graded levels each of nitrogen (20, 30 and 40 kg/ha), phosphorus (30, 45 and 60 kg Pa05/ha) and potash (10, 20 and 30 kg K20/ha) on the yield and quality of green gram variety, Pusa Baisakhi grown in rice fallows of the Instructional Farm, College of Agriculture, Vellayani, Trivandrum has shown that the grain yield was significantly increased by highest level of potash over the lowest level and bhusa yield by highest level of nitrogen over the lower levels. Levels of nutrients had no significant influence on grain protein content, but highest level of potash significantly increased the grain protein yield over the lowest level. In the case of protein content of bhusa, higher levels of potash showed an adverse effect whereas fodder protein yield was not significantly affected by the treatments.
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    Optimum and economic levels of phosphorus and potassium fertilisation for groundnut (Arachis Hypogaea L.)
    (Kerala Agricultural University, 1981) Purushothaman, N; Sadanandan, N; Sasidhar, V K; Nair, K P M
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    Performance of sunflower varieties under graded doses of nitrogen in redloam soils of Kerala
    (Kerala Agricultural University, 1978) Salam, M A; Sadanandan, N; Nair, K P M; Mohamed Kunju, U
    An experiment using three varieties of sunflower and three levels of nitrogen was conducted at the College of Agriculture, Vellayani during 1974 in order to assess the performance of sunflower varieties under different levels of nitrogen. The varieties tried were EC.68413, EC. 6841 4 and Sunrise selection. The levels of nitrogen were 40 kg, 90 kg and 120 kg per hectare. The results indicated that there was no significant difference among the varieties in plant height, total dry matter production, leaf area index net assimilation rate, lodging, head diameter, number of seeds per head, percentage of filled grains per head, 1000 seed weight and yield of seeds. But, there was significant difference in the yield of atover and oil and protein contents of seeds among them. The effects of incremental doses of nitrogen were significant in head diameter and yield of seeds. Maximum yield of 1887.1 kg seeds per hectare was obtained at 80 kg nitrogen per hectare.
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    Response of groundnut to phosphorus and potassium under different water management practices
    (Kerala Agricultural University, 1983) Jose Mathew; Nair, K P M; Kuriakose, T F
    A field experiment conducted in the sandy loam soil of the Agronomic Research Station, Chalakudy, to study the effect of different irrigation schedules (0.3, 0.6 and 0.9 IW/CPE ratios) and graded doses of phosphorus and potassium 25,50 and 75 kg P205 and K20 per ha respectively) on the growth attributes, yield and yield characters has shown that growth attributes like plant height, number of branches per plant, number of leaves per plant and LAI were favourably influenced by irrigation and application of potassium. Yield characters like number and weight of mature pods per plant, 1 00 pod weight and 1 00 kerne! weight were higher at higher levels of irrigation, phosphorus and potassium. Highest yield was recorded when irrigations were scheduled at 0 9 IW/CPE ratio (irrigating once in 12 days) and 50 kg P205 and 75 kg KaO per ha was found to be sufficient for better yields.
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    Studies on the yield and quality of guinea grass (Panicum Maximum, J) as affected by different spacings with and without legumes as intercrops
    (Kerala Agricultural University, 1979) Krishna Raj, P; Sadanandan, N; Nair, K P M; Sasidhar, V K