"I am performing zinc biofortification in chickpea so I want to know that at what dose of Zinc (100ppm or 500ppm) , the better growth parameters at the end of the experimental trial will be seen ?"
Four to five kg of urea can be very useful in solubilizing Zinc Sulfate using 1 kg of Zinc sulfate and using water for a hectare 100 to 200 liters water . If foliar ppm in leaf tissue is less than 25 ppm the application can be helpful and when levels rises to 50 ppm or more that is in an optimum range in foliar tissue analysis.
Dear Ravindra Kumar Panigrahi, This document might be of use in relation to zinc deficiency.
The use of sizable amounts of phosphate without Zinc can induce artificially zinc deficiency. Zinc deficiency is typically seen as shortening of internodes chlorosis and barreness. pH is a big predict as Zinc is not much available in alkaline soils particularly in sensive crops. Maize is quite responsive to zinc fertilization under these conditions.
https://www.longdom.org/.../effect-of-foliar-application-of-plant-growth- regulators-on-growth-and-flower-quality-of-gladiolus-cv-hbpitt-23...
If you looking for a foliar number from leaf analysis where zinc will be sufficient anything over 30 to 50 ppm should provide sufficiency for that element.
Actually it will depend on crop species and Zinc availability. Sometimes it may be toxic to plant so care should be taken before foliar doses of zinc.
If people experience phytotoxicity with zinc application the zinc source of organic chelate will be preferred and the the use of humic/fulvic acid can be useful. This reduces toxicity reactions and is effective for better movement into and within the plant.
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