Effect Of Nutrient Solution PH On The Absorption Of Iron In Four Cultivars Of Grape
2006
Mirsoleimani, A., Instractor of Horticulture, College of Agriculture and Natural Resorce of Darab, Shiraz University. | Tafazoli, E., Professor of Horticulture, College of Agricultur Shiraz University.
Rooted cuttings of four cultivars of grape namely, Askari, Rotabi, Siyah and Rishbaba were planted in sand culture to study the effect of nutrient solution pH on the absorption of iron (Fe). Treatments were four pH levels of half concentration Hogland nutrient solution (namely pH 6, 7, 8 and 9). The criteria measured were chlorophyll, greenness, fresh and dry weight of aerial parts of plants and total Fe concentation and Fe++ of root, stem and leaves. The results showed that incresing pH and bicarbonate concentration of nutrient solution significantly reduced chlorophyll content and greenness of leaves in all 4 cultivars. But no signs of chlorosis were seen in the leaves of any cultivars.Only pH= 9 significantly reduced fresh and dry weight of aerial parts in all cultivars. The highest Fe++ level of leaves was seen at pH= 6 and the lowest at pH= 9.Thus the best treatment was pH 7 and the most tolerant cultivars was Rishbaba.
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