Thumbnail Image

Theses

Browse

198711
Reset filters
Subject: Agronomy × End date: 1987 × Start date: 1987 ×
Reset filters

Search Results

Now showing 1 - 9 of 11
  • Thumbnail Image
    ThesisItemOpen Access
    Response of modern varities of rice to nitrogen in kole lands
    (Department of Agronomy, College of Horticulture, Vellanikkara, 1987) Premkumar, J; KAU; Sreedharan, C
    An experiment was carried out in Kole lands during the Kole season of 1985 (December-January to March-April) to ascertain and compare the nutritional requirement of short duration rice varieties and pre – release culture 10-1-1. The treatments consisted of factorial combination of 3 varieties ( Jyothi, Culture 10-1-1 and Triveni) and 5 levels of nitrogen (50,70,90,110 and 130kg N ha-1) in Randomised Block Design, replicated thrice. It was found that the pre-release Culture 10-1-1 had significantly higher plant height, tiller number, leaf area index, dry matter production, number of panicles per m2 and thousand grain weight over other varieties. Triveni recorded the highest filled grains per panicle and weight per panicle. There was no variation in grain yield among the cultivars tested. Culture 10-1-1 registered the highest straw yield and nutrient uptake. Culture 10-1-1 also recorded the highest net income over the varieties tested. Application of nitrogen increased the vegetative characters and yield attributes of rice viz., plant height, tiller production, number of panicles per m2, panicle length, panicle weight, filled grains per panicle and thousand grain weight. The highest grain yield and net income was obtained by Jyothi at 110 kg N ha-1 and that for culture 10-1-1 and Triveni at 90 kg N ha-1. Straw yield and dry matter production were increased upto 110 kg N ha-1. The uptake of nutrients were also influenced positively by nitrogen fertilization. The per day production of Jyothi, culture 10-1-1 and Triveni was found to be 42.65, 51.63 and 49.88 kg, respectively at 90 kg N ha-1. The present investigation revealed that the optimum level of nitrogen fertilization to be 103.74, 97.48 and 93.07 kg ha-1 for Jyothi, Culture 10-1-1 and Triveni, respectively. It was also observed that the field duration of culture 10-1-1 was only 77 days compared to that of 79 and 91 days of Triveni and Jyothi respectively. Benefit cost ratio was highest for Culture 10-1-1 thus indicating the scope of popularizing this cultivar as a short duration variety in Kole land.
  • Thumbnail Image
    ThesisItemOpen Access
    Effect of different levels of nitrogen phosphorus & potassium on the growth & yield of vegetable cowpea var. kurutholapayar grown as an intercrop in the coconut gardens & in the open
    (Department of Agronomy, College of Agriculture, Vellayani, 1987) Rajesh, Chandran; KAU; Abdul Salam, M
    Field experiments were conducted at the college of Agriculture, Vellayani during 1986 to study the effect of three levels of nitrogen (10,20 30 kg/ha), three levels of phosphorus (20, 40, 60 kg P2 O5 /ha) and three levels of potassium (10,20 and 30 kg K2 O/ha) on the growth, yield and quality of vegetable cowpea Var. Kurutholapayar grown in the coconut gardens and in the open. The experiment was laid out in a 33 factorial experiment with two replications confounding NPK in replication I and NP2 K2 in replication 2. The same experiment was simultaneously laid out, both in the open and in the coconut garden. The abstract of the results is presented below. Nitrigen application upto 30 kg/ha or phosphorus application upto 60 kg P2O5/ ha increased the vine length, leaf number per plant, dry matter production, number of pods per plant and number of seeds per pod. Application of 30 kg N/ha or 60 kg P2 O5/ ha resulted in the highest uptake of nitrogen and phosphorus. The highest potassium uptake was noticed with the application of 20 kg K2 O/ ha. The fresh bhusa yield of vegetable cowpea var. Kurutholapayar increased with N application upto 30 kg/ha or P application upto 60 kg P2 O5/ha. Application of potassium had no significant effect on the fresh pod yield of vegetable cowpea in the red loam soils of vellayani containing medium amounts of potassium. A maximum net income of Rs. 11,044.80 was obtained from the plants raised in the open by the application of “30 kg N along with 60 kg P2 O5 and 30 kg K2 O/ha”. In general, vegetable cowpea grown in the open showed a much better performance compared to those raised under the partial shade.
  • Thumbnail Image
    ThesisItemOpen Access
    Potential and prospects of fodder legumes in rice fallows
    (Department of Agronomy, College of Horticulture,Vellanikara, 1987) Achuthan, Nair; M, KAU; Meera, Menon; V
    An experiment was conducted in the Agricultural Research Station , Mannuthy during third crop season of 1985-’86 and first crop season of 1986-’87 to evaluate the relative performance of fodder legumes in rice fallows and their residual effect on the succeeding crop of rice under graded levels of N. The experiment, replicated thrice, was laid out in a split plot design with seven treatments – six fodder legumes (sannhemp, soya bean, rice bean, velvet bean, cowpea and black gram and a fallow- as main plot treatments and two N levels (52.5 and 70 kg/ha) applied to kharif rice as sub-plot treatments. The results revealed that sannhemp gave a fodder yield of 21 t/ha in rice fallows which was significantly superior to all other treatments. An increase in soil organic carbon, total and available N was also noticed. Soil organic carbon and total N was highest in the cowpea cropped plot. Available N in the soil was highest in the velvet bean cropped plot and the fallow plot recorded the lowest values. Increased rice grain yield was recorded after legumes compared to fallow and the highest grain yield was recorded after velvet bean followed by that after sannhemp cowpea and black gram. Application of N at the recommended dose of 70 kg/ha produced superior yields compared to N at 52.5 kg/ha. Rice crop succeeding fodder legumes with 75% N produced grain yield comparable to that after fallow receiving 100% N. The net income and returns per rupee invested were highest after the sannhemp-rice sequence followed by the cowpea-rice sequence. The results proved that 25% N could be saved in the case of rice after legumes. The study also showed the superiority of sannhemp and cowpea in fodder yield and residual effect in the succeeding rice crop.
  • Thumbnail Image
    ThesisItemOpen Access
    Nutritional requirement of pre-release sesamum culture 42-1 in garden land
    (Department of Agronomy, College of Agriculture, Vellayani, 1987) Raveendran Nair, P; KAU; 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.
  • Thumbnail Image
    ThesisItemOpen Access
    Fate and efficiency of urea based fertilizer N for rice
    (Department of Agronomy, College of Agriculture, Vellayani, 1987) Babu Mathew, P; KAU; Tajuddin, E
    With a view to evaluate the comparative efficacy of different urea modified materials at various doses of N, an experiment was conducted at the Cropping Sytems Research Centre, Karamana during 1985-86. The experiment was laid out in a split plot design with three replications. There were five levels of nitrogen (0, 37.5, 75, 112.5 and 150kg/ha) in the main plots and six types of urea (prilled urea, urea super granules, urease inhibited urea, Neem cake coated urea, Sulphur coated urea and Rock phosphate coated urea) in the sub plots. The rice variety used was Jaya. The abstract of the results are given below. The highest tiller production was observed when USG was applied @ 150 kg N/ha. Application of SCU @ 112.5 kg N/ha, resulted in the production of highest amount of dry matter at harvest. Application of SCU or USG @ 112.5 kg/ha, resulted in the highest N uptake. Nitrogen recovery percentage was highest when NCU or SCU was applied @ 37.5 kg N/ha. Plants supplied with SCU or USG resulted in the production of more number of spikelets/panicle and higher test weight.
  • Thumbnail Image
    ThesisItemOpen Access
    Response of maize varieties grown in rice fallows to graded levels of nitrogen
    (Division of Agronomy, College of Agriculture, Vellayani, 1987) Jaleesa, K; KAU; Sasidhar, V K
    An experiment was conducted at the Instructional Farm, College of Agriculture, Vellayani during summer season 1985-86 to find out the response of five maize varieties viz. Ganga safed-2, Agathi-76, Hi-starch, Vijay and Ganga-5 to graded levels of nitrogen in rice fallows. The different levels of nitrogen tried were 50,80, 110, 140 and 170 kg/ha. The experiment was laid out in split-plot design with four replications and 25 treatment combinations.
  • Thumbnail Image
    ThesisItemOpen Access
    Nutritional studies in sweet potato
    (Department of Agronomy, College of Agriculture, Vellayani, 1987) Bhuvanandran, D; KAU; Muraleedharan Nair, V
    An investigation was conducted in the upland soils of Banana nursery, Peringammala to study the comparative performance of four sweet potato varieties under different levels and times of nitrogen and potassium application. The treatments consisted of three levels of nitrogen (50, 75 and 100 kg N/ha) and three levels of potassium (50,75 and 100kg K2O/ha) at two times of application. Four varieties (Cross-5, H-2743, H-4021 and H-4126) were studied in the experiment. The experiment was laid out in a split plot cum confounded design with two replications
  • Thumbnail Image
    ThesisItemOpen Access
    Integrated weed management in transplanted medium duration rice
    (Department of Agronomy, College of Agriculture, Vellayani, 1987) Beena Maheswari, S K; KAU; Madhavan Nair, K P
    An experiment was conducted in the Instructional Farm attached to the College of Agriculture, Vellayani during the second crop (Mundaltan) season of 1985-86 to develop a suitable weed control method for medium duration transplanted crop o{ rice in randomised block design with 15 treatments and 3 replications. During the third crop (Punja) season a succeeding crop of cowpea was raised to assess the residual effect of the herbicides. Monocot weeds predominated throughout the crop growth. Herbicide application controlled the weed population better than handweeding twice. Thlobencarb © 1.0 kg a.i/ha as spray plus one handweeding at 35 DAT gave the highest weed control efficiency next to the completely weed free treatment. Lower dose of thloben carb or butachlor ( 1.0 kg a.i/ha ) were sufficient to increase the dry matter accumulation of crop in the earlier stages, while higher dose (1.5 kg a.i/ha) was required during later stages. Plant height, tiller count and LAI were higher in the herbicide treatments compared to the weedy check.
  • Thumbnail Image
    ThesisItemOpen Access
    Dynamics of applied nitrogen in acidic soils of Kuttanad 1. karappadom soil
    (Department of Agronomy, College of Horticulture, Vellanikkara, 1987) Liji John; KAU; Thomas, J
    The present study on 'Dynamics of applied nitrogen in acidic soils of Kuttanad 1. Karappadom soil' was conducted at the College of Horticulture, Vellanikkara, Trichur from January 1986 to December 1986. A total of six materials viz. urea, ammonium sulphate, neem coated urea, neem coated ammonium sulphate, gypsum coated urea and rock phosphate coated urea were used as N sources. The experiment included limed and unlimed treatments of these sources at two moisture regimes