Browsing by Author "Chandrasekharan, P"

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Consumptive use, pattern of soil moisture extraction and water use efficiency of bittergourd (Momordica Charantia L.) under varying irrigation and nitrogen levels
(Kerala Agricultural University, 1993) Manorama Thampatti, K C; Santha Kumari, G; Reena Mathew; Chandrasekharan, P
The influence of graded doses of nitrogen and varying levels of irrigation on consumptive use of water, paltern of soil moisture extraction, water use efficiency and f r u i t yield of biltergourd were evaluated during 1988-89 and 1989-90. The consumptive use of water and lit/Eo values of bittergourd increased progressively with levels of nitrogen and irrigation. At higher moisture regimes the variation in consumptive use and Ht/Eo values did not reflect in crop yield. Wale ruse efficiency of the crop maintained a positive relation with levels of nitrogen and a negative relation with levels of irrigation. The soil moisture extraction paltern was not influenced by nitrogen levels. Major part of water was extracted from upper layers of soil irrespective of treatments.
Effect of N P K fertilisers in conjunction with "Spartin" on the growth and yield of brinjal
(Kerala Agricultural University, 1973) Chandrasekharan, P; George, C M
Effect of phosphorus and lime on the growth attributes and yield Stylosanthes gracilis Swartz
(Kerala Agricultural University, 1980) Mariyappan, H; Chandrasekharan, P; Raghavan Pillai, G
A field experiment conducted to study the effect of graded doses of phosphorus (0,40, 80, 120 and 160 kg/ha ) on the growth attributes, green and dry matter yields of Stylosanthes gracilis Swartz with two levels of lime [0 and 500 kg/ha] in the red loam soils of the Instructional farm, College of Agriculture. Vellayani has shown that growth attribuies like plant height, number of leaves, number of branches and leaf/stem ratio were not influenced by the application of graded doses of phosphorus except lime which increased the leaf number significantly. Phosphorus at the rate of 120 kg/ha recorded the maximum green matteryteld and dry matter production. Although lime level at 500 kg/ha failed to produce significant increase in green matter and dry matter yields, a positive trend was noticed by lime application.
Effect of phosphorus, lime and cutting interval on green fodder yield, nodulation and protein enrichment of Stylosanthes gracilis and nitrogen in soil
(Kerala Agricultural University, 1987) Mariyappan, H; Chandrasekharan, P; Raghavan Pillai, G
An experiment was conducted at the Instructional Farm, College of Agriculture, Vellayani, Kerala during 1977-78 to study the effect of phosphorus levels, lime and cutting intervals on green fodder yield, protein enrichment and nodulation of Stylosanthes gracilis and nitrogen build up in the soil. The treatments constituted five levels of phosphorus viz., 0,40, 80, 120 and 160 kg P205/ha, two levels of lime viz., 0 and 500 kg CaO/ha and two intervals of cutting viz., 30 days and 45 days. The green fodder yield, protein content and protein yield were found to increase progressively upto 120 kg P205/ha. The combination of phosphorus and lime had significant influence in increasing the green fodder yield and protein content. Cutting interval of 45 days recorded more green fodder yield and the combination of 120 kg phosphorus per hectare with 30 days interval of cutting recorded the maximum protein content. Nodule number and weight were found to increase progressively upto 120kg P205/ha. but lime and cutting interval had no significant influence. An increase of 7.3% of total nitrogen content of soil with increase in the levels of phosphorus was observed. Phosphorus and lime together contributed for the increase in the available nitrogen.
Effect of salt solution spray on paddy grain maturity and yield
(Kerala Agricultural University, 1979) Oommen, M; Chandrasekharan, P; Sadanandan, N
Effect of soil and foliar application of N and P on the yield and quality of blackgram (Vigna Mungo (L) Hepper)
(Kerala Agricultural University, 1988) Elizabeth K Syriac; Chandrasekharan, P; Nair, V M
A field experiment conducted during the third crop season of 1981—'82 in the rice fallows of the Rice Research Station, Kayamkularn, to study the comparative efficiency of soils as well as foliar application of nitrogen, phosphorus and their combination on the growth, yield and quality of blackgram revealed that the grain yield was significantly increased by the combined application of nitrogen and phosphorus partly through soil and partly through foliage. The maximum grain yield (1631 kg/ha) and net profit (Rs. 3254.80) were recorded by the treatment in which both nitrogen and phosphorus (20 kg N and 30 kg P205/ha) were given 1/3 through soil as basal dose and 2/3 in two equal split doses through the foliage, at the vegetative phase and at flowering. Protein content of grain and grain protein yield were also significantly influenced by the treatments receiving both nitrogen and phosphorus partly through soil and partly through foliage.
Improving fertiliser use efficiency in sesamum in Onattukara tract
(Department of Agronomy, College of Agriculture, Vellayani, 1996) Regy, V J; Chandrasekharan, P
An experiment was conducted in the summer rice fallows of the Rice Research station, Kayamkulam during 1995 to study the effect of two levels of nitrogen (22.5, and 30 kg N ha-1) three levels of potassium (0, 22.5 and 30 Kg K2O ha-1) and two methods of application (75 per cent) each of nitrogen and potassium as basal and 25 per cent each of nitrogen and potassium as foliar spray at branching (m1), 50 per cent each of nitrogen and potassium as basal and 50 per cent each of nitrogen and potassium as foliar spray as to equal splits at branching and just before flowering (m2) on the growth, yield, oil and protein content, chemical composition of oil cake, nutrient status of soil after the experiment and economics. The study revealed that nitrogen affected LAI, LAD and NAR, but failed to have any influence on height of the plants, number of branches plant-1, height at which first bearing node formed, RGR, CGR, yield attributing characters, yield and oil content. Test weight, net return, benefit cost ratio, protein content, uptake of nitrogen, phosphorus and potassium at harvest were significantly affected by the applied levels of nitrogen. Nitrogen and phosphorus status of soil after the experiment decreased with higher levels of nitrogen. Higher level of nitrogen resu1 ted in higher nitrogen and phosphorus status of oil cake than lower level of nitrogen. Applied potassium affected most of the growth characters, protein content, oil content, nutrient uptake by the plant at harvest, nutrient status of soil after the experiment, nitrogen and phosphorus content of oil cake, but not the potassium content of oil cake. Oil content increased with increasing levels of potassium from 0 to 30 kg K2O ha-1, but protein content increased only upto 22.5 kg K2O ha-1. Further increase to 30 kg K2O ha-1 decreased the protein content. Methods of application failed to influence most of the growth characters except LAI, LAD,NAR, RGR and CGR. Yield attributes, yield, and quality attributes also had not influence by different methods of application, while nutrient uptake by the plants at harvest, total nitrogen and available potassium status of the soil after the experiment and phosphorous content of oil cake were affected significantly by different methods of application. Interaction between nitrogen and potassium significantly influenced height at first bearing node formed, LAI, LAD, NAR, RGR, CGR, grain yield, net return, benefit cost ratio, oil content, protein content, nutrient uptake by the plants and available potassium status of soil after the experiment, Interaction between nitrogen and methods of application had significantly influenced growth characters, uptake of nutrients and nutrient status of soil after the experiment, Phosphorus content of oil cake was only influenced by different combined application of nitrogen and methods of application.
Influence of age of seedlings, spacing & time of application of nitrogen on the yield of rice var I. R. 8
(Kerala Agricultural University, 1977) Panikar, R S; Balakrishna Pillai, P; Chandrasekharan, P
Influence of graded levels of N, P and K on growth and yield of horse gram
(Kerala Agricultural University, 1988) Kumari Swadija, O; Chandrasekharan, P; Nair, V M
Influence of the method of application of N and P on the growth, yield and quality of blackgram [Vigna mungo (L.) Hepper]
(Department of Agronomy, College of Agriculture, Vellayani, 1983) Elizabeth K Syriac; Chandrasekharan, P
Nitrogen nutrition of "rohini"- a short duration rice variety
(Kerala Agricultural University, 1985) Chandrasekharan, P; Abdul salam, M
Note on the effect of salt solution spray on the germination of seed in rice
(Kerala Agricultural University, 1979) Oommen, M; Chandrasekharan, P; Sadanadan, N
Nutritional requirement for horsogram (Dolichos biflorus Roxb.)
(Department of Agronomy, College of Agriculture, Vellayani, 1984) Kumari Swadija, O; Chandrasekharan, P
A 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 hectare
Nutritional requirement of pre-release sesamum culture 42-1 in garden land
(Department of Agronomy, College of Agriculture, Vellayani, 1987) Raveendran Nair, P; Chandrasekharan, P
A 4 raise to 3 fatorial experiment confounding NPK (3 df) totally in replication I and II was conducted under garden land condition at the Instructional Farm, College of Agriculture, Vellayani, during semirabi season 1984, to study the effect of graded doses of nitrogen (10, 30, 50 and 70 kg/ha), phosphorus (5, 15,25 and 35 kg P2O5/ha) and potassium (10, 30,50 and 70 kg K2O/ha) on the growth , yield , quality, content and uptake of mineral nutrients and also to work out the economics of production with the pre-release sesamum culture 42-1 (now released as Soorya or ACV-2). The study revealed that application of nitrogen significantly influenced growth , yield and yield attributing characters. Phosphorus and potassium produced significant influence on number of leaves and leaf area index on 40 and 60 days after sowing. Significant effect of phosphorus was also observed on number of branches, pod-seed ratio, bhusa yield, thousand seed weight and total dry matter production. Applied potassium significantly influenced the yield and yield attributing characters like number of pods , weight of pod per plant, pod seed ratio, seed yield and harvest index.
Nutritional requirement of the sesamum variety Thilothama in partially shaded uplands
(Department of Agronomy, College of Agriculture, Vellayani, 1985) Girija Devi, L; Chandrasekharan, P
An experiment was conducted in the red loom soils of the Instructional Farm, College of Agriculture , Vellayani during 1983 to study the effects of three levels of nitrogen (0, 20 and 40 kg N/ha), three levels of phosphorus (0, 15 and 30 kg P2O5/ha) and three levels of potassium (0,20 and 40 kg K2O/ha) on the growth, yield, oil and protein content and chemical composition and uptake of mineral nutrients of sesamum. The field trial was laid out as a 3 factorial experiment confounding NPK in replication - 1 and NP2K2 in replication-2.
Partial substitution of potassium with sodium in sweet potato
(Department of Agronomy, College of Agriculture, Vellayani, 1995) Joggy Mariam George; Chandrasekharan, P
An investigation was carried out at Instructional Farm, College of Agriculture, Vellayani to study the effect of substituting potassium with sodium in varying levels in sweet potato. The levels of substitution consists of 0, 12.5, 25, 50 and 75 per cent, as potassium and sodium on equivalent basis. The trial was laid out in RBD with four replications. Partial substitution of potassium with sodium to the extent of 50 per cent increased the growth attributes like length of vine, number of branches plant -1 and LAI at all growth stages. Physiological parameters like TBR and CGR were increased due to the combined application of potassium and sodium on 50:50 ratio. Marketable tuber yield and yield attributes like number of tubers plant-1, length of tuber and girth of tuber were increased by the combined application of both the cations. Combined application of potassium and sodium increased the quality attributes of tubers like starch, protein and total sugar. Cooking qualities was also found to be better when potassium and sodium were applied together. Pest incidence was also reduced when both the cations were applied in 50:50 ratio. Combined application of K and Na produced maximum N, P and Na content in tubers whereas K content was maximum at zero per cent substitution. Uptake of nutrients (N, P, K and Na) were maximum at 50 per cent substitution. Soil properties like pH, Ec, water holding capacity, available potassium and sodium were not affected by treatments. Physiological efficiency of N, P and Na were found to be maximum at 0 per cent substitution whereas that of K was maximum at 75 per cent substitution. Agronomic efficiency and recovery fraction of N, P and Na was found to be increased in the presence of both cations. Fifty per cent substitution of potassium by sodium was more economic than the existing package of Practices Recommendation.
Response of ragi (Eleusine coracana Gaertn,) to different levels of nitrogen, phosphorus and potassium under rainfed conditions
(Department of Agronomy, College of Agriculture, Vellayani, 1981) Johnkutty, I; Chandrasekharan, P
Spacing cum fertilizer investigation on rice variety, Mashuri, in the Onattukara tract
(Department of Agronomy, College of Agriculture, Vellayani, 1983) Sobhana, S; Chandrasekharan, P
With a view to investigate the influence of different fertilizer levels, spacings and their combinations on the growth and yield of rice variety, Mashuri, in the sandy loam tracts of Onattukara, an experiment was conducted at the Rice Research Station, Kayamkulam, during the second crop season of the year, 1981-82. The response of the variety to four fertilizer levels (50 : 25 : 25, 60:30:30, 70:35:35 and 80:40:40 kg/ha NPK), four spacings (10cm X 5 cm, 10cm x 10 cm, 15 cm x 10 cm and 20 cm x 1o cm) and their combinations was studied. The experiment was laid out in randomised block design , as a 4 x 4 factorial experiment with three replications.
Studies on the effect of NPK in combination with trace elements on the yield of bhindi
(Kerala Agricultural University, 1970) Chandrasekharan, P; George, C M