Relationship between chloride and nitrate and its effect on growth and mineral composition of avocado and citrus plants

Y. Bar, A. Apelbaum, U. Kafkafi, R. Goren
1997 Journal of plant nutrition  
Two rootstocks of avocado (Persea americana Mill.), the salt-tolerant 'Degania-113' and the salt-sensitive 'Smith', and two rootstocks of citrus, the salt-tolerant 'Cleopatra' mandarin (Citrus reshni Hort. ex Tan) and the salt-sensitive 'Troyer' citrange (Poncirus tri/oUata x Citrus sinensis [L.J Osbeck), 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
more » ... in all avocado plant parts, and toxic symptoms that were more pronounced in the 'Smith' than in the 'Degania-113' avocado rootstock. When leaves of both rootstocks had accumulated similar chloride levels and showed scorching damage, the leaves of 'Degania-I13' abscised, while those of 'Smith' did not. High chloride reduced the total dry matter yield of the root more than that of the shoot, decreasing the "root: shoot" dry weight ratio in both rootstocks. Addition of nitrate to the irrigation water reduced chloride accumulation in the plant and alleviated its adverse effects. Accumulation of nitrogen in the plant exceeded that of chloride in all cases. High nitrate reduced phosphorus levels in the 715
doi:10.1080/01904169709365288 fatcat:alfdorl7q5cthfrdpil74sj62a