Gardening With Roses
THE COMPLETE BOOK OF ROSES
The media increases, boron becomes less available to plant absorption. Absorption of boron and other nutrients in rose have been demonstrated by Haag et. al., (19841 The critical nutrient level of B in the tissue ranges front 25 pm, to 100ppm, with monocots normally containing less boron than dicots (Chapman, 1973). For high quality rose, leaf tissue content of boron should be between 30 to 60mg/kg. This is based on data of Boodley and White, cited by Mastalerz (1977). Boron is involved in carbohydrate metabolism particularly in the translocation of photosynthate (/Catyal and Randhawa, 1983). Boron helps in maintenance of conducting system and water relations (Joiner el. al., 1983). It also helps in translaation of sugar to corolla and delays senescence of petals thialevy and Mayak, 1981). Boron plays a role in the active salt absorption, buffer action, and precipitation of excess cations and regulation of other elements and that, iris a membrane constituent (Couch and Ungar, 1954). As the pH of the media increases, Bo becomes less available for plant absorption (Mongel and Kirkby, 1978). Furthermore, boron is regarded immobile in plants, and Oertli and Richardson (1970) attributed this to high local immobility combined with net upward flow of boron in the transpirational stream of leaves From a field trial experiment M “Raktagandha” rose Bhattacharjee (1996) studied Inc influence of boron in growth, flowering, post harvest life and nutrient rernobilization. It was reported by him that foliar sprays of boron in November and January was found very effective over soil applications. Between the two foliar treatments, boron spray at 0.2 percent markedly Improved the vegetative growth, flower yield and flower quality. The treatment significantly improved fresh and dry weight of out flowers, increased water uptake and lengthened the vase life. Treatment of boron, particularly 02% foliar spray, was very effective in increasing the uptake of Fe, Zn and B; while no significant difference was noted with N and K uptake.
INFLUENCE OF INORGANIC FERTILIZERS
A rose receives the food through the leaves and through the roots. If healthy and vigorous growth is to be maintained, there must be correct balance betiveen the two There are wide variations in the physical structure and chemical composition of soil in the rose growing area of different countries. Hence, feeding and manuring can never be precise and exact under all circumstances. These depend so much on local conditions and on differing individual experiences. Reginar feeding of balanced fertilizers in roses at monthly or even more frequent intervals throughout the growing season is essential. Some further feeding is necessary after the first flush to build up the bushes and ensure the good subsequent crop. Iris essential to apply fertilizers to rose for sustained production and maintenance of proper growth. Inorganic fertilizers are swifter in their action as compared to organic manure. Nitrogenous fertilizers are more important at proper time. Phosphorus also helps in production of more and better blooms. Adequate supply of potash is needed for production of well-ripened wood to withstand frost and infectiotss from pest and diseases.
INFLUENCE OF NITROGEN AND PHOSPHORUS
Balanced feeding with nitrogen and phosphorus impart vigor to the plant, increase size and brightness of flowers, stimulate flowering, and encourage sturdy and healthy foliage. Maharana and Pradhan (1976) recommended 15gm N and 8grn P,O, per pat of “Celebration” rose for better production.