THE ROLE OF HUMIC ACID AND ROOTSTOCK IN ENHANCING SALT TOLERANCE OF"LE-CONT" PEAR SEEDLINGS | ||
| Journal of Plant Production | ||
| Article 20, Volume 32, Issue 5, May 2007, Pages 3651-3666 PDF (995.78 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpp.2007.208152 | ||
| Authors | ||
| Fawzia M. Eissa; M. A. Fathi; S. A. El-Shall | ||
| Hort. Res. Inst., Agric. Res. Center, Giza, Egypt | ||
| Abstract | ||
| The effect of humic acid treatments (soil, foliar and soil + foliar with Actosol which contain 2.9 % humic acid and 10-10-10 NPK) on growth parameters (shoot length, number of leaves, leaf area and leaf chlorophyll content), nutritional status (percentage of leaf dry matter and NPK content), root growth (root length, number of roots, and dry matter of main and secondary roots), toxic ions (chloride and sodium leaf content), and amino acid proline of ‘Le-Conte’ pear plants budded on Pyrus communis or P. betulifolia rootstocks was studied under 0, 1000 and 2000 ppm saline irrigation water that contained equal parts by weight of: NaCl, CaCl2, MgSO4, and NaHCO3. Salinity treatments significantly decreased growth parameters, nutritional status and root system growth, while they significantly increased toxic ions and proline amino acid content. Salt tolerance of P. betulifolia rootstock was higher than that of P. communis as ‘Le-Conte’ pear plants on P. betulifolia rootstock grew better. Humic acid application (especially soil treatment with 20 ml Actosol in 1 L of water per 35 cm pot every other week from late June to October 15th) markedly minimized the harmful effects of salinity and enhanced pear salt tolerance. | ||
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