Browsing by Author "Sadanandan, N"

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    Agronomic investigations on 'TARO' (Colocasia esculenta L.) variety - Thamarakannan
    (Department of Agronomy, College of Agriculture, Vellayani, 1986) Mohan Kumar, C R; Sadanandan, N
    In order to standardize the cultural and fertilizer requirement of two (Colocasia esculata) two separate field experiments were conducted during 1983-84 and 1984-85 at the College of Agriculture, Vellayani. The first experiment (Experiment A) with treatments consisting of two sources of planting material (side and mother corn) four spacing (60 x 30, 45 x 45, 60x 45, 60x60 cm) and five sources of mulching (Green leaf, Coconut coir/husk waste, Water hyacinth, black polythene and no mulch) was conducted in asplit plot design. The second experiment (Experiemnt B) was a 3 x 2 partially confounded factorial design with three levels each of nitrogen (40,80,120 kg ha-1), P2O5 (25, 50,75 kg ha-1), K2O (50, 100,150 kg ha-1) and two times of application (two split application of N and K and three split application of N and K) with two replication
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    Comparative performance of soybean varieties in rice fallows
    (Kerala Agricultural University, 1980) Sasidhar, V K; Sadanandan, N
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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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    Cultural, manurial and water requirements for sweet potato (Iponoea batatas (L) Lam.)
    (Department of Agronomy, College of Agriculture, Vellayani, 1989) Oommen, M; Sadanandan, N
    Three field experiments were conducted in the wet lands and garden lands of Instructional farm of College of Agriculture, Vellayani to work out cultural, manurial and water requirements for sweet potato. The treatments in the first experiment – Nutritional requirements of sweet potato – consisted of three level of nitrogen (50, 70 and 100kg N/ha), three levels of phosphorus (25, 50 and 75kg P2O5/ha) and three levels of potassium (50, 75 and 100kg K2O/ha). The experiment was laid out in a 33 partially confounded factorial design with two replications. The second experiment – spacing cum depth of application of fertilizers – consisted of three spacing (40cm x 20cm, 60cm x 20cm and 80cm x 20cm) and three depths of application of fertilizers (10cm, 20cm and 30cm). The experiment was laid out in a 32 factorial design in RBD with four replications. The third experiment – Irrigation requirement – consisted of four levels of irrigation (IW/CPE ratios 0.25, 0.50, 0.75 and 1.00) and four levels of fertilizers (50:25:50, 75:50:75, 100:75:100 and 125:100:125 kg N,P and k/ha). The experiment was laid out in a split plot design with five replications. In the experiment to study the nutritional requirement of sweet potato growth attributes like length of vine, number of branches and leaf area index were maximum at higher levels of nitrogen and potassium. The highest values of tuber number, tuber weight, length of tuber and girth of tuber were obtained by the application of 75kg N, 50kg P2O5 and 100kg K2O/ha. Application of nitrogen, phosphorus and potassium at the rate of 75:50:100 kg/ha was found to be optimum for higher tuber yield. While nitrogen nutrition increased the protein content of tuber, potassium application enhanced the starch content. Highest levels of nitrogen, phosphorus and potassium increased the leaf, stem and tuber dry matter production and tuber bulking rate. Potassium only did influence the net assimilation rate. Crop growth rate was maximum at higher levels of nitrogen, phosphorus and potassium. The plant uptake of nitrogen, phosphorus and potassium was maximum at the highest level of these nutrients. The NPK combination of 75kg N, 50kg P2O5 and 100kg K2O/ha resulted in the maximum net return. Experiment on spacing cum depth of application of fertilizers revealed that wider spacing of 80cm x 20cm enhanced the growth characters such as length of vine, number of branches and LAI. Depth of application was not influential on this aspect. Yield attributes like tuber number, tuber weight and girth of tuber were higher at the spacing of 40cm x 20cm but length of tuber was maximum under wider spacing. Application of fertilizers at 20cm depth recorded maximum values for the aforesaid characters. Closer spacing of 40cm x 20cm and 20cm deep placement of fertilizers recorded higher tuber yield. Among the quality attributes protein content alone was influenced by wiser spacing, but protein and starch contents were increased when fertilizers were applied at 20cm depth. Wider spacing increased leaf and stem dry matter and CGR while closer spacing recorded higher tuber dry matter, tuber bulking rate and net assimilation rate. Depth of application of fertilizers did not influence the dry matter production. Plant uptake of nitrogen, phosphorus and potassium was increased by wider spacing and by the application of fertilizers at a depth of 20cm. A combination of 40cm x 20cm spacing and 20cm deep fertilizer placement resulted in maximum net return. Experiment on irrigation requirements divulged that highest IW/CPE ratio and higher fertilizer combinations recorded maximum length of vine and LAI, but number of branches was not influenced by them. Number of tubers, weight of tubers, length of tubers and girth of tubers were not influenced by irrigation, while levels of fertilizers increased the length of tubers. Tuber yield was higher at IW/CPE ratio of 0.75. Fertilizer combination of 100:75:100 kg of N, P and k/ha produced the maximum yield. Starch and protein contents were increased at higher levels of irrigation and fertilizer application. Total dry matter production and bulking rate increased upto an IW/CPE ratio of 0.75 and upto a fertilizer lever of 100:75:100 kg N, P and k/ha. Plant uptake of nitrogen, phosphorus and potassium at harvest was maximum at higher levels of irrigation and fertilizer application. Irrigating the field when the IW/CPE ratio becomes 0.75 and application of fertilizers at a ratio of 100:75:100 kg N, P and k/ha recorded maximum net returns.
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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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    Ecophysiology of azolla and its management for rice production
    (Department of Agronomy, College of Agriculture, Vellayani, 1985) Alexander, D; Sadanandan, N
    In order to explore the agronomic potential of azolla for rice production, an investigation entitled 'Ecophysiology of azolla and its management for rice production ' was carried out at the Regional Agricultural Research Station, Pattambi, during the years 1980 to 1984 with the following objectives: (1) To study the influence of environmental conditions on the growth and establishment of azolla. (2) To assess the nutritional requirement of azolla. (3) To find out the time of application and optimum quantity of azolla inoculum required for growing it as an intercrop with rice. (4) To identify the geometry of planting rice favouring the multiplication of azolla in the field.
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    Effect of application of 2,4-Dd mixed with urea in low-land direct sown rice
    (Kerala Agricultural University, 1989) John, P S; Sadanandan, N
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    Effect of CCC (2-chloroethyl trimethyl ammonium chloride) on growth and yield of sweet potato variety H 42
    (Kerala Agricultural University, 1976) Nambiar, I P S; Sadanandan, N; Mohamed Kunju, U
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    Effect of CCC on the starch content of sweet potato tuber
    (Kerala Agricultural University, 1977) Nambiar, I P S; Sadanandan, N; Mohamed Kunju, U
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    Effect of continuous N P K Fertilization on the growth and yield behaviour of coconut with special reference to potash nutrition and its interrelation with other mineral nutrients
    (Department of Agronomy, College of Agriculture, Vellayani, 1985) Pushpangadan, K; Sadanandan, N; Coconut
    At the Coconut Research Station , Balaramapuram in Trivandrum District of Kerala State an experiment was laid out in 1964 to assess the growth characters, yield attributes and yield of coconut variety West Coast Tall. The study was further enlarged to include the critical levels of leaf nutrient concentration as related to yield and the soil fertility statusdue to continued NPK fertilization . The treatments consisted of three levels of N, P and K (N-0, 340, and 680 g;P-0, 225 and 450 g and K-0, 450 and 900 g per palm per year). The experiment was laid out in a 3 raise to 3 partially confounded factorial design with two replications. Application of N enhanced the growth characters viz., production of female flowers, percentage fruit set, yield of nuts, weight of nuts, mean thickness and weight of meat, weight of copra and oil percentage. However the effect of N was found to be quadratic at the highest level applied. Application of P although improved the female flower prodcuction, its effect was negative towards copra weight and oil percentage . For the remaining characters studied, the initial level of 225 g per tree per year was found to be adequate.
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    Effect of different levels of nitrogen and phosphorus on the uptake of nitrogen and phosphorus at various stages of growth of sunflower variety peredovik
    (Kerala Agricultural University, 1976) Thomas Varghese, P; Sadanandan, N; Vikraman Nair, R
    An experiment was conducted at the College of Agriculture, Vellayani to study the effect of graded doses of nitrogen and phosphorus on the uptake of nitrogen and phosphorus at three growth stages of sunflower viz 20th day after planting, flowering and harvest. The effect of nitrogen up to 90 kg/ha resulted in significant linear increase in nitrogen uptake at all the stages except on the 20th day after planting. Phosphorus at 90 kg level showed significance in enhanced nitrogen uptake at the 20th day of planting but not later. While for the phosphorus uptake, significant effect was noticed due to increased levels of application of nitrogen at all the three stages, levels of applied phosphorus did not bring about significant changes in the uptake of this nutrient Increase in uptake of these nutrients showed a linear relationship with the magnitude of growth of the plants.
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    Effect of different levels of nitrogen and phosphorus on the uptake of phosphorus by rice variety - triveni
    (Kerala Agricultural University, 1974) Alexander, K M; Sadanandan, N; Sasidhar, V K
    A field experiment was undertaken during the third crop season of 1971 to study the effect of different levels of nitrogen and phosphorus on the uptake of phosphorus by the rice variety 'Triveni'. It was found that with increasing levels of nitrogen, the total uptake of phosphorus increased during all the growth stages of the crop. Similarly nitrogen phosphorus interaction significantly increased the phosphorus uptake at harvest. Different levels of phosphorus had no significant effect on the uptake of phosphorus during any of the growth stages of the crop.
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    Effect of different levels of nitrogen and potash on the growth, yield and quality of tapioca variety, H-165
    (Division of Agronomy, College of Agriculture, Vellayani, 1975) Natarajan, M; Sadanandan, N
    An experiment was conducted at the College of Agriculture, Vellayani, with the object of studying the effect of different levels of nitrogen (50, 100 and 150 kg H per hectare) and potash (50 100 and 150 kg KgO per hectare) on the growth yield end quality of a high yielding variety of tapioca H-165. The experiment was carried out in a 5 factorial Randomised Block Design with four replication Nitrogen and potash were supplied in the form of ammonium sulphate and muriate of potash respectively. The results of the experiment are summarised hereunder:- 1. Basal dressing of nitrogen and potash increased the number of leaves and plant height. 2. Different levels of nitrogen significantly increased the number of leaves in the early stages of growth. The maximum number of leaves wee recorded a t 120th day after planting a t 150 kg H/hectare. 3. Nitrogen significantly increased the plant height at all stages of growth. The maximum height was recorded at harvest with 150 kg N/hectare. 4. There was increase In the number of leaves on 90th and 120th day after planting due to potash application. Maximum number of leaves was produced on 120th day after planting by 150 kg K2O per hectare. 5. The different levels of potash increased the plant height at all stages of growth except at 50th day after planting. She maximum height was recorded at harvest with 150 kg per hectare.
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    Effect of different levels of phosphorus on the yield of rice variety 'Rohini' in Vellayani
    (Kerala Agricultural University, 1971) Sasidhar, V K; Sadanandan, N
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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 graded doses of nitrogen and phosphorus on the available phosphorus status of soil during various growth stages of rice
    (Kerala Agricultural University, 1974) Alexander, K M; Sadanandan, N; Sasidhar, V K
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    Effect of graded doses of nitrogen on growth and yield of sweet potato variety, H.42 in red-loam soils
    (Kerala Agricultural University, 1976) Nambiar, I P S; Sadanandan, N; Mohamed Kunju, U
    A field experiment was conducted in the red-loam soils of Agricultural College Farm, Vellayani during 1974-1975 to study the effect of graded doses of nitrogen (50, 75 and 100 kg/ha) on the growth and yield of sweet potato, variety H. 42. The length of vine, weight of vine, and length of individual tuber were not significantly influenced by levels of nitrogen whereas the number of tubers per plant was significantly increased due to incremental doses of this nutrient and the response was linear. The yield of tuber was increased progressively with incremental doses of nitrogen. Nitrogen at 100 kg. /ha recorded an yield of 104.92 quintals of tuber per hectare while 50 kg. N/ha gave only an average yield of 81.43 quintals.
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    Effect of graded levels of nitrogen on the yield and quality of lemongrass oil
    (Kerala Agricultural University, 1984) Rajan, K C; Sadanandan, N; Nair, E V G
    An experiment to study the effect of graded levelsof nitrogen on lemongrass varieties revealed that OD 19 and SD 68 were on par and significantly superior to RRU 16 in grass production and oil yield. RRL16 recorded maximum oil content and minimum citral percentage. Effect of nitrogen on grass and oil yield was significant. Levels of 1 00 kg N and 50 kg N were on par and Superiorto control in oil yield, but 50 kg N/ha was on par with 100 kg N/ha and control in the case of grass yield. Oil content was maximum at higher nitrogen levels compared to control in most of the harvests.
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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