Salinity, either of soil or of irrigation water, causes disturbances in plant growth and nutrient balance. Previous work indicates that applying nutrients by foliar application increases tolerance to salinity. A pot experiment with three replicates was carried out in the green house of NRC, Cairo, Egypt, to study the effect of micronutrients foliar application on salt tolerance of faba bean. Two concentrations of a micronutrient compound (0.1% and 0.15%) were sprayed in two different treatments prior to or after the salinity treatments. Levels of NaCl (0.00-1000-2000-5000 ppm) were supplied to irrigation water. Results indicated that 2000 and 5000 ppm NaCl inhibited growth and nutrient uptake. Spraying micronutrients could restore the negative effect of salinity on dry weight and nutrients uptake, when sprayed either before or after the salinity treatments. It is suggested that micronutrient foliar sprays could be used to improve plant tolerance to salinity.
The purpose of this work was to study the effects of adding different concentrations of iron (Fe), manganese (Mn) and zinc (Zn) in irrigation water to high‐pH sandy soil on the growth and micronutrient uptake of sunflower plants (Helianthus annus L., cv. Giza 1). The experiment was carried out in Mitscherlish pots under greenhouse conditions. Low Fe, Mn and Zn concentrations were found to have a positive effect on the micronutrient contents of the plant organs. The number of leaves and the leaf area were increased by addition of Fe, Mn and Zn. Root size was increased by addition of Fe and Mn. Stem and root lengths were increased by Mn only. It could be concluded that continuous addition of Fe, Mn and Zn in irrigation water to high‐pH sandy soil deficient in these nutrients, where root growth was contained within a limited volume (in pots), led to increases in growth and micronutrient uptake (Fe, Mn and Zn). Further studies are needed to determine whether similar effects will be found under field conditions.
A pot experiment was conducted in the vegetation house of the programme "Micronutrients and Other Plant Nutrition Problems in Egypt" , National Research Centre with faba bean (Vicia faba, Giza 3) plants. The work aimed at studying the effect of different levels (in the rate of 100, 150 and 200 Kg/fed) of the different used dry plant materials (algae, water hyacinth and clover) as soil additives on plant nutrient uptake and their concentrations in the plant tissues as well as plant growth, yield and yield components. The obtained data showed that high positive correlations are found between increasing levels of the green materials and nutrients uptake, yield and 100 seed weight (gm). Nearly all additives of such materials increased macroand micronutrients uptake and concentrations in the plant tissues. They consequently increased fresh weight, dry weight and plant height (cm) of the plants. Algae treatments were superior followed by water hyacinth, but clover treatments were less effective. Treatment of 200 Kg/fed gave the best results followed by the treatment 150 Kg/fed. Treatments with those materials led to average seed yield increases of 21 %, 23 % and 25 % over control with clover, water hyacinth and algae, respectively. The average weight (gm) of 100 seed increases over control reached 75.9 % with clover, 79 % with water hyacinth and 83 % with algae treatments. The study suggests that using of such available and cheap materials can partially substitute chemical fertilizers in order to increase yields and avoid more environmental pollution.
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