http://www.erepo.iihr.ernet.in/handle/123456789/405 2013-05-16T18:34:18Z 2013-05-16T18:34:18Z R, Smitha http://www.erepo.iihr.ernet.in/handle/123456789/442 2012-11-22T20:30:12Z 2000-01-01T00:00:00Z

Title: Effect of different growing media and pH on growth and development of Anthurium andreanum L. Authors: R, Smitha Abstract: Anthurium is gaining importance in the global cut-flower trade because of its attractive and long lasting flowers. Commercial cultivation of this crop started recently in India and hence there is a need to standardize the growing techniques. Anthurium plants require a growing medium with good physical and chemical properties for their proper growth and development. In the present study coir pith, a waste product of coir industry, was tested in combination with different proportions of normal potting medium (soil, sand and FYM in 2:1:1 ratio) to find of their suitability as substrate for Anthurium. Coir pith and normal potting medium ratio of 100:0, 75:25, 50:50, 25:75 and 0: 100 were tried in the experiment. In each growing media three levels of pH (4.5-5.5, 5.5-6.5-75) were maintained to determine the optimum range of pH for Anthurium. The experiment was designed in a completely randomized factorial design with fifteen treatment combinations. Increased proportions of coir pith in the growing media improved the physical properties viz., maximum water holding capacity, porosity and drainage. The bulk density and particle were lowered with the addition of coir pith due to the increase in pore space and lighter weight of particle. The pH of the growing medium was decreased with increasing proportions of coir pith whereas CEC was found to be increasing with increasing amounts for coir path. The available NPK status of coir pith containing medium was higher than that of normal potting medium. The growth parameters like leaf area, number of levers, petiole length, petiole thickness and number of roots were maximum in 100% coir pith medium. The number of suckers per plant, fresh weight and dry weight were higher in T2 (75% coir pith + 25% normal potting medium) and T1 (100% coir pith) growing media when compared to other growing media treatments. Early flowering was also noticed in these two media where plants flowered within a period of eight months. Leaf water potential was improved by increasing amounts of coir pith in the growing media. The light of these results, it can be concluded that for better growth and development of Anthurium the most suitable growing medium is the one containing coir pith alone. Among the different pH levels maintained in the media, slightly acidic pH range of 5.5-6.5 was optimum for the growth of Anthurium plants.

2000-01-01T00:00:00Z M V, Balaram http://www.erepo.iihr.ernet.in/handle/123456789/441 2012-11-22T20:30:11Z 2000-01-01T00:00:00Z

Title: Genetic and pollen studies in Gladiolus spp Authors: M V, Balaram Abstract: Gladiolus is one of the important bulbous ornamentals grown in many parts of the world. In India it has now gained importance as a cut flower for domestic consumption and also for export. A study was carried out at IIHR, Bangalore to generate information on genetic and pollen related characters in Gladiolus spp. Studies on the relative performance of India (11) and exotic (24) Gladiolus genotypes showed that Indian cultivars were early in spike emergence, had more florets per spike, more spikes per corm, high corm multiplication rate, larger corms, more viable pollen and short flowering duration. While, exotic genotypes had larger florets, more florets open at one time, longer spikes and high cormel multiplication rate. Since, exotic cultivars exhibited better spike/floret characters which are of economic importance they may be grown on a commercial scale. High phenotypic and genotypic co-efficient of variation, heritability and genetic advance recorded for number of shoots per plant, number of spikes per corm, number of daughter corms, number of cormels percorm, 25 cormel weight and propagation co-efficient suggests selections of genotypes based on these traits for further improvement through effective breeding programmes. Studies on the association of various morphological traits through correlation and path co-efficients analysis showed that, plant height, spike girth, number of florets open at one time, florets length, weight of daughter corm and rachis length had positive and significant correlations with maximum direct effects on number of florets per spike. While leaf number, floret diameter and spike length though had positive and significant correlations. Spike weight, and equatorial corm diameter had maximum indirect effects with significant and positive correlations. Number of daughter corms had significant positive association and direct effects on number of shoots per plant and 25 cormel weights. While, number of shoots per plant through had significant and positive correlation, it exhibited maximum indirect effect. The feasibility studies on storing pollen from five promising varieties viz., Darshan, Dhiraj, Sagar, Sapna and Shobha developed at IIHR and G. callianthus a wild fragrant species at sub zero temperatures of -65 oC and -196 oC (in liquid nitrogen) showed negligible loss in the viability, vigour and fertility levels of pollen (from all the genotypes) upon storage compared to fresh pollen. Hence, there are no species/varietal specific pollen storage temperatures.

2000-01-01T00:00:00Z M N, Anuradha http://www.erepo.iihr.ernet.in/handle/123456789/440 2012-11-22T20:30:11Z 2000-01-01T00:00:00Z

Title: Chemical regulations of vase life of cut Anthuriums Authors: M N, Anuradha Abstract: Research was carried out to extend the vase life of cut Anthurium flowers of cv. Liver Re, Meringue and Casino by using different chemicals in combination with sucrose and germicides. The prime objective was to standardize optimum concentration of vase solution for the above cultivars by using growth regulators and metal salt in combination with sucrose and germicides. Studies include the use of growth regulators namely Triadimefon, Benzyl adinine, Mineral salts and AgNO3. Each of these at 4 different concentrations, each in combination with two levels of sucrose, 4 & 6% and germicide 8 HqO at 400 ppm were used. It was observed that the chemicals used have shown to have maximum quantity of cumulative water uptake and higher water uptake to water loss ratio in the treated spikes. As a result there was a better water balance to maintain fresh weight which eventually leading to the increased longevity of flower. Best vase life improvement in the three cultivars was by 87%, 89%, and 93% respectively with chemical treatment over control. The period of initiation of the symptoms associated with senescence was drastically delayed by treatment with different concentrations of TAF, BA, AGNO3 in combination with sucrose and germicides over control. Though all the chemicals used had beneficial effects in terms of better water relations to extend vase life in all 3 cultivars of anthuriums. BA was more effective followed by TAF, AGNO3 in all three, in combination with sucrose and 8 HqO.

2000-01-01T00:00:00Z Padmanabha Pillai http://www.erepo.iihr.ernet.in/handle/123456789/439 2012-11-22T20:30:11Z 1998-01-01T00:00:00Z

Title: Effect of coco peat media and electrical conductivity on production of Gerbera jamesonii Authors: Padmanabha Pillai Abstract: The experiment was carried out with gerbera to study the influence of coco peat based potting mixtures on production and leaf nutrient content of Gerbera jamesonii. The treatments include 100, 75, 50 and 25 per cent coco peat mixed with various proportion of normal growing media supplied with nutrient solutions having three different electrical conductivity 1.3 ds/m(E1), 1.8 ds/m (E2) and 2.3 ds/m (E3). The medium containing higher proportion of coco peat had good physico- chemical properties. The pH of the growing media decreased with increase in nutrient EC levels. The medium containing 100% coco peat supplied with nutrient solution having EC of 1.8 ds/m (E2) produced good quality flowers. The build up of EC was high in 100 per cent coco peat medium and low in normal growing medium. The phosphorus, potassium, calcium, magnesium, sulphur and micronutrients in leaves were determined after 4 months after planting. The leaf phosphorus, manganese, zinc, copper and sodium contents were high in 100 per cent coco peat medium while potassium and calcium contents were at optimum level. However, magnesium, sulphur and iron content were high in normal growing medium. In general, the nutrient contents increased with increased coco peat proportion.

1998-01-01T00:00:00Z