If we want to spray 5% zinc ha-1, how can we make 5% solution of zinc? what is the correct formula to make this percentage?
To my mind '5% Zn ha-1' does not convey anything. It should be something like spray 200 litres of 5% Zn solution per ha. Then it makes sense and one can prepare 200 litres of solution containing 5% Zn and spray it on one ha area.
Dear UAL
I agree with the others 5% Zinc does not mean much.
Zinc sulfate is not very soluble and does not absorb well.
Target water at 200 to 300 liters per acre. In your tank used humic acid and urea to activate the solubility and absorption of your spray. Use 50 g of Humic Acid 3 kg of Zinc Sulfate and 5 kg of urea. Use agitation and make sure they dissolve. Take a measurement of clean water pH and adjust if alkaline to a slightly acid pH 5.5 is good.
If you take a foliar analysis of 20 leaflets as a baseline you are probably deficient if less than 20 ppm.
Spray your recipe and take another 20 leaflets and compare the atomic analysis if your have 25 or more and symptoms of chlorosis are gone you may not need addition application. Repeat if the symptoms are not gone and atomic analysis is not over 25 ppm.
This protocol will allow the confirmation of a deficient state and a confirmation by level and symptom relief of the resolution of the issue. You need to start the application before the rapid vegetative growth stage and have the resolution before flowering.
Hope you find this helpful.
PRH
I am including an article which reviews some of avenues of addressing Zinc deficiency.
A 5% w/v Zn solution is very strong and likely to give leaf burn. Like the others above, the Zn is in zinc salt solution e.g. zinc sulphate. When calculating the amounts to weigh out, you need to take into account any water of hydration of the zinc salt you selected.
straightway 5% Zn /ha , you cannot implement . And as Lindsay said 5% Zn will be surely toxic , regardless of crop . Foliar spray of Zn at such high concentration is never practiced, could be 0.30-0.80% , depending upon the crop . I am enclosing some of our published literature on Zn-nutrition for further reading on the subject . Hope , they will be useful.
Zinc is best applied by foliar fertilization. You might choose- depending on local availability - between Zinc sulphate Heptahydrate, which is cheaper and better soluble and cotains approx. 22% Zn and zinc chelate (e.g. Zn-EDTA) which is more expensive, but may be better absorbed and is certainly better compatible with pesticides, particularly when you apply multiple pesticides simultaneously in a smaller spray volume. As to Zn-Sulphate you may apply 1kg/ha or between 0.1-0.5% solution and as to a liquid Zn-EDTA product with approx. 6% Zn 1-2 L/ha.
ZnSo4 contain around 35% Zn, and Zn chelate contain 14% Zn , Zn chelate is very soluble in water. So depending on availability at first, W/V basis fertiliser solution can be made then again V/V basis can be made from stock solution as per recommended Zn dose of that particular location and crop.
Some bottle 500 ml or 250 ml can be available of different companies containing Zn 5% or 8% or 10% solution. Usually it can easily apply on ha-1 with simple calculation following the direction on the bottle. Fertilizers ZnSo4 contain around 35% (Satyen Mondal ), then you have to divided fertilizer in kg. if 50 kg bag contain 35% zn. Then 1 kg fertilizer = 0.7 then 7.2= 5.04. In this way solution can be made.
Dear all thank you very much for guiding me. I used the word 5% is not really mean 5%, it was just an example to simplify the question, okay if zinc is to be applied at 0.5% or 1% then how a solution for one hectare could be made. how much quantity of water and how much quantity of zinc from a bottle could be selected and if zinc is available in powder form what quantity could be selected to make 0.5% or 1% zinc solution for a hectare?
Again thanks all, I understood some but not very clear about it
We need to quantify the amount of nutrient solution that is being used either in an ha area or on per plant basis . Dr Bijay Singh has rightly pointed out.
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