Zarad,, S., Zaied, N., Khafagy, S. (2002). EFFECT OF CHLORIDE AND NITRATE SALTS ON GROWTH AND MINERAL COMPOSITION OF AVOCADO AND CITRUS ROOTSTOCKS. Journal of Plant Production, 27(7), 4897-4907. doi: 10.21608/jpp.2002.255728
S. S. Zarad,; Nagwa S. Zaied; Salwa A. Khafagy. "EFFECT OF CHLORIDE AND NITRATE SALTS ON GROWTH AND MINERAL COMPOSITION OF AVOCADO AND CITRUS ROOTSTOCKS". Journal of Plant Production, 27, 7, 2002, 4897-4907. doi: 10.21608/jpp.2002.255728
Zarad,, S., Zaied, N., Khafagy, S. (2002). 'EFFECT OF CHLORIDE AND NITRATE SALTS ON GROWTH AND MINERAL COMPOSITION OF AVOCADO AND CITRUS ROOTSTOCKS', Journal of Plant Production, 27(7), pp. 4897-4907. doi: 10.21608/jpp.2002.255728
Zarad,, S., Zaied, N., Khafagy, S. EFFECT OF CHLORIDE AND NITRATE SALTS ON GROWTH AND MINERAL COMPOSITION OF AVOCADO AND CITRUS ROOTSTOCKS. Journal of Plant Production, 2002; 27(7): 4897-4907. doi: 10.21608/jpp.2002.255728
EFFECT OF CHLORIDE AND NITRATE SALTS ON GROWTH AND MINERAL COMPOSITION OF AVOCADO AND CITRUS ROOTSTOCKS
Botany Dept.· and Hart. Dept.··, National Research Center, Dokkl, Giza, Egypt
Abstract
This investigation was carried out during two successive years (2000 & 2001) in an orchard for sub-tropical fruits located in Abou-Rwash district, Giza Governorate, Egypt. Two rootstocks of avocado (Persea americana Mill.), the salt-tolerant "Hass" and the salt-sensitive "Duke" and two rootstocks of citrus, the salt tolerant "Rangpur" lime (Citrus limonia) and the salt-sensitive "Volkamer" lemon (Citrus votuemerene; were grown in a sandy soil and irrigated daily with nutrient solutions containing various chloride concentrations. Increasing the concentration of chloride resulted in elevated chloride levels in avocado leaves, and toxic symptoms that were more pronounced in the "Duke" than in the "Hass" avocado rootstocks. When leaves of both rootstocks had accumulated similar chloride levels and showed scorching damage, the leaves of "Hass" abscised, while those of "Duke" did not. High chloride reduced the total dry matter yield of the root more than that of the leaves. Addition of nitrate to the irrigation water reduc~d chloride accumulation in the leaves and alleviated its adverse effects. High nitrate reduced phosphorus levels and caused chlorosis in young leaves. Citrus rootstocks responded similarly, but leaves of the chloride-sensitive "Volkamer' accumulated more chloride than "Rangpur". Nitrate reduced chloride accumulation and toxic symptoms in the leaves of the two citrus rootstock.
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