5483
HAGAR MOHAMED ABD El – MAGIED
RESPONSE OF Pinus halepensis Mill. AND Grevillea robusta A. Cunn. SEEDLINGS TO SOME TREATMENTS OF BIOFERTILIZERS, BIOSTIMULANTS AND MINERAL NUTRIENTS
Pinus halepensis Mill. and Grevillea robusta A. Cunn., biofertilizers, zinc, cobalt,
nickel, selinum and biostimulants.
This study was carried out in the Experimental Nursery of Ornamental Horticulture Department, Faculty of Agriculture, Cairo University, Giza, during two seasons 2014-2015 and 2015-2016 to study the response of Pinus halepensis Mill. and Grevillea robusta A. Cunn. seedlings to some treatments of biofertilizers, biostimulants and mineral nutrients. The obtained results can be summarized as follows: 1. The inoculation with (NFB) significantly increased plant height and number of branches of P. halepensis in both seasons, while (AMF) resulted in the longest branches and leaves (needles), the heaviest stem fresh and dry weights. The treatment of (PSB) produced the thickest of stems and main roots as well as the longest roots and increased the fresh and dry weights of leaves and roots. The treatments of (GSB) and (PSB) were the most effective in case of pigments (chall-a, b and cartonoieds). The content of total carbohydrates increased markedly with (NFB). 2. Spraying P. halepensis seedlings with Zn at 100 ppm gave the tallest plants and branches as well as the thickest stems, the heaviest fresh and dry stems. Whereas, the maximum number of branches/plant and the heaviest fresh leaves were produced by treating with Se at 5 ppm. The highest values of needles length, main root diameter and length as well as fresh and dry weight of roots were recorded in plants sprayed with Ni at 10 ppm. Spraying pine plants with Se at 5 ppm and Ni at 10 and 5 ppm resulted in the maximum values of chlorophyll-a, while, the highest content the of chlorophyll-b was produced by Co and Ni at 10 ppm. Treatments of Zn at 50 and 100 ppm, significantly increased the content of total carotenoids as well as total carbohydrates (%D.W.), N, P, K% and Zn (ppm) in all parts of pine seedlings, in the two season. The maximum Co concentration (ppm) in all parts of seedlings were recorded by treating with Co at 10 and 5 ppm, in different order, however the highest Ni concentration (ppm) in needles, stems and roots were obtained by Ni at 10 and 5 ppm, in both seasons. Anatomical study on main stem of P. halepensis indicated that the values of all tissues diameter and length in transverses sctions as well as in longitudinal sections in plants treated with zinc at 100 ppm were higher over those of untreated plants. 3. Sprayed G. robusta plants with Zn at 100 and 50 ppm produced the tallest plants, the thickest stem and main root as well as the heaviest fresh and dry weights of all plant parts. The plants treated with Ni at 10 ppm gave the maximum numbers of leaves and the longest roots. Spraying plants with Ni at 10 and Se at 5 ppm increased the content of chlorophyll-a, b and total carotenoids, while treating seedlings with Zn at 50 and 100 ppm increased the total carbohydrates, N%, P%, K% and Zn (ppm). The plants produced the maximum concentration of Co (ppm) when they were sprayed with Co 10 and 5 ppm, however the concentration of Ni (ppm) were increased markedly in response to 10 and 5 ppm of Ni treatments. Study the anomatical structures of the transverse and the longitudinal sections of main stem of G. robusta were showed an increments by treated with Zn at 100 ppm as compared with untreated plants. 4. The application of seaweed extract (algae) and humic acid on G. robusta seedlings resulted in the tallest plants, the greatest number of leaves/plant, the thickest stems and root, the maximum weights of all plant parts. Seedlings of G. robusta were obtained great response to humic acid and seaweed extract treatments, which produced the highest content of chlorophyll-a, b and total carotenoids as well as total carbohydrates (%D.W.), N, P and K% in the various parts
2018
Ph.d
Cairo
Agriculture