الفهرس | Only 14 pages are availabe for public view |
Abstract Snap bean (Phaseo/us vulgaris, L.) is one of the most important vegetable crops grown in Egypt, which occupies a great figure in the local consumption and export. The cultivated area for green and dry common bean reached to 37000 and 18000 feddan, respectively according to statistics data of 1994. Average total yield / feddan was 4.75 tons for green pods yield and 1.167 tons for dry seed yield in 1994. Snap bean crop requires a comparatively small amount of nitrogen compared with other vegetable crops. This legume crop is associated with symbiotic bacteria that convert atmospheric nitrogen into forms the plant can use. These bacteria depend directly upon the plant for their energy supply and can not convert atmospheric nitrogen into a usable form unless they are assoclated with specific plants. The amount of nitrogen converted into a usable form depends upon the vegetable involved, and the estimated pounds of nitrogen fixed per acre for some vegetables are as follows: Peas 72 Ib, peanut 42 Ib, beans 40 lb and soy beans 58 Ib (Delwich, 1970). These bacteria may be purchased in a pea and bean inoculant. If the area has never grown by beans or peas before, some of this inoculant can be dusted onto the moistened (not soaked) seed. On the other hand, if the area has grown beans before, it is usually of little value to add additional inoculant. However, the ability of the roots of legumes to extract and fix nitrogen from the soil atmosphere, due to the activity of bacteria of the Rhizobium genus, which live in symbiosis within the legume roots. provides an advantageous mechanism. For the establishment of leguminous crops on soils which have low nitrogen reserves, many leguminous plants can develop bacterial nodules on their roots in relatively acid conditions and on soils, which may be slightly deficient in P, Ca and other elements. However, farmers differ between each other in fertilizing snap beans plants. Some fertilize snap beans with high level of P, K and small amount of nitrogen . To secure further information in this regard, this study was conducted to evaluate the response of some snap bean cultivars to different levels of NPK fertilization with or without inoculation with Rhizobium . Descriptive information of their growth. mineral composition and yield were considered. |