Showing papers on "Corchorus olitorius published in 2000"

Seed agronomy of jute. II. Production and quality of Corchorus olitorius seed as influenced by nutrient management

Abstract: The study attempted to improve the olitorius jute seed yield consistent with quality through judicious management of N, P and K. Field experiments were conducted in a sandy loam soil during May-November, 1994 and 1995 using a randomised block design with three replications. The nutrient levels tried were N 10 P 10 K 10 N 20 P 20 K 20 , N 40 P 40 K 40 en N 60 P 60 K 60 . The modes of N application were (1) 50% N as basal and the remaining 50% at 30 days after sowing (DAS) (2-split-normal), (2) 50% N at 25 DAS and 50% N during topping at 45 DAS (2-split-modifled) and (3) 50%, 25% and 25% N at 25, 45 and 65 DAS respectively (3-split). Harvesting was done at full maturity of pods and seed quality (viability and vigour) was assessed. The study suggests that gradual increase in the level of NPK fertihzation exerted beneficial effect on components of growth, seed yield and its vigour. Three-split N application excelled over both 2-split-normal and 2-split-modified in terms of pod number, pod weight, seed yield per plot, plant nutrient content and proportion of bolder seeds in the produce. Interaction between nutrient level and mode of N application also revealed beneficial effects on these aspects (except nutrient centent) with 3-split N application at the highest nutrient level.

Interaction Effect of Potassium and Zinc on the Growth and Uptake by Jute ( Corchorus olitorius L.) in Fine Vertic Ochraqualf Soil

Abstract: A pot culture experiment was conducted on jute (Corchorus olitorius L) grown in Lateritic soil of Panagrah during 1993 and 1994 to study the effect of K and Zn application on dry matter production and their uptake by jute crop fibre and wood Application of K and Zn increased the total dry matter, bark (fibre) and wood up to 40 mg K kg−1 and 5 mg Zn kg−1 levels respectively Total K uptake increased significantly with the application of K and Zn individually Uptake of K by both b'ark and wood was also significant due to application of K alone But the effect of Zn alone and K x Zn interaction on fibre and wood did not show any significant results However, Zn uptake by the whole plant increased significantly due to application of all levels of K and Zinc upto 5 mg kg−1 respectively With the increasing level of potassium, zinc absorption increased significantly with significant decrease in K/Zn ratio of the whoie plant

Field evaluation of kenaf, mesta, and related genera for their reactions to spiral borer.

Abstract: Out of 10 kenaf (Hibiscus cannabinus L) cultivars assessed under field conditions against spiral borer (Agrilus acutus Thumb), one was rated resistant, one was moderately resistant, one was moderately susceptible, five were susceptible, and two were highly susceptible Levels of resistance expressed in two cultivars of mesta (H sabdariffa L), one of deshi jute (Corchorus capsularis L), two of tossa jute (C olitorius L), one of okra [Abelmoschus esculentus (L) Moen], one accession of H radiatus Cav, two of H acetosella Welw ex Hiern, and one of ban-dheras (Malachra capitata L) ranged from resistant to highly resistant Among the resistant materials, there were no significant differences in the amount of plant damage However, where per cent infestation was considered, PI 343128 (one cultivar of kenaf) was found to be significantly different from the other resistant materials The cultivar CVL-1 (C capsularis) was found to be completely free from borer attack (0% infestation and 0% damage) The presence of significantly high levels of resistance observed in mesta (H sabdariffa) and other related species (H radiatus and H acetosella) indicate a potential use in breeding programmes for developing resistant cultivars High levels of resistance in related genera (C capsularis, C olitorius, A esculentus, and M capitata) indicate that these genera would not act as alternate hosts of A acutus

Wholesale harvest of vegetable jute (Corchorus olitorius L.) as a labor-saving measure

Abstract: To reduce the amount of labor needed to harvest vegetable jute (Corchorus olitorius L.), wholesale harvest with dense planting was examined. In this harvest method, the cutting position was fixed on a horizontal plane. Workers could use scissors at a constant height to minimize movement. As a result, by transplanting at a density of 119 plants per square meter, the marketable yield was reduced by 12%, the required time for harvest was reduced by 63%, and the marketable yield per working hour increased by 140% when compared with the values obtained by a conventional multiple harvest. By direct sowing at a density of 135 plants per square meter, the marketable yield was reduced by 28%, the required time for harvest was reduced by 87%, and the yield per working hour was increased by 442% of the values obtained by a conventional multiple harvest. Harvested leaves were soft and showed a high-quality color.

Comparative response of Chromolaena odorata and Corchorus olitorius to intraspecific competition.

Abstract: Chromolaena odorata and Corchorus olitoriuswere grown at 5, 10, 15 and 20 plants/pot to evaluate the response of individual plants to intraspecific competition after 10 weeks. Both species showed considerable plasticity in plant height, root dry matter production and biomass partitioning but competitive effects were significant in respect of leaf production, leaf area and photosynthetic efficiency (as indicated by LAR). Competitive effects were also significant with resport to shoot and total dry weights and individual plant weight (weight per plant) in C. Olitorius. The reduction in leaf area was greater with increasing plant density in C. odorata while C. olitorius showed greater reductions in leaf production and LAR. Weight per plant was reduced significantly by 0.56 g for each, unit increase in plant density for both species. Differences in plant response to intraspecific competition were due to growth habit and physiology. These differences have practical implications on population regulation and relative competitive ability of these two weeds in cropping situations.