Growth and nutrient contents response of maize to foliar nutrition with micronutrients under irrigation with saline water
2002
Abou El-Nour, E.A.A. (National Research Centre, Cairo (Egypt). Botany Dept.)
A pot experiment was conducted to investigate the influence of spraying salinity-stressed maize plants grown on two soils (sandy and clay) with micronutrients on growth, expressed as root and shoot dry matter production and macro - and micronutrient contents. Treatments were: 1- irrigation with tap water; 2- irrigation with a mixture of NaCl and CaC12 (each of 2g/L) and 3- treatment 2 plus 4 foliar sprays with EDTA - micronutrient compound containing 2.8% Fe plus 2.8% Mn plus 2.8% Zn plus 14% N. at rate 1 g/L. Root growing media had significant effect on growth and nutrient contents. Clay soil showed better growth as well as more nutrient contents as compared with sandy soil medium. Salinity treatment had a negative effect on growth and nutrient contents measured in root and shoot except in case of root Ca and shoot Na. Spraying salinity-stressed plants with micronutrient compound showed a significant positive effect on root dry weight, while this treatment could decrease the depression in shoot dry weight caused by salinity treatment. Spraying salinity-stressed plants with micronutrient compound showed a significant positive effect on both root and shoot nutrient contents with some exceptions, where shoot N and P contents showed slight reduction as compared with control treatment. The interaction effect between soil type and micronutrients foliar spray was significant.
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