How to fertilize jujube trees
The types and amounts of fertilizer needed for different periods of time vary for jujube, and how to fertilize fertilizer is an important part of jujube cultivation.
A. The types of fertilization requirements for jujube
The nitrogen fertilizer that can be used for extra-root fertilization includes urea, ammonium sulfate, ammonium nitrate, ammonium chloride and well-rotted methane and human urine and manure. Among them, urea has high nitrogen content (46%), small molecular volume, strong diffusion, and easy absorption by the tree, so it is used more and better in extra-root fertilization.
The actual fact is that you will be able to get a good deal on your own.
The only way to meet the nutrient needs of the jujube tree is to use high concentrations as much as possible, and to accelerate the absorption of nutrients. The following fertilizer concentrations are commonly used outside the roots of jujube trees.
Urea 0.3% to 0.5%, ammonium sulfate 0.1% to 0.3%, ammonium nitrate 0.1% to 0.3%, 5% to 10% of rotted methane and human urine; potassium dihydrogen phosphate 0.2% to 0.3%, calcium superphosphate 1% to 3%, ammonium phosphate 0.3% to 0.5%; potassium sulfate 0.5% to 1%, grass ash 1% to 5%, potassium sulfide 0.3%.
Borax 0.2%～0.4%, boric acid 0.1%～0.5%, ferrous sulfate 0.2%～0.4%, magnesium sulfate 0.2%～0.3%, calcium nitrate 0.5%, calcium chloride 0.5%, zinc sulfate 0.1%～0.4%.
Third, the time of fertilization of winter dates
Urea, ammonium sulfate, well-rotted marsh liquid and human urine is generally sprayed before and after flowering to improve the fruit set rate; also in the new tips stop growing to October, can make the leaves increase in size, become green to improve light and efficiency.
From August to before fruit maturity, we choose to spray potassium phosphate, potassium chloride, potassium nitrate, potassium sulfate, etc., which can improve the fruit quality and storage resistance of winter dates.
4. Pay attention to prevent fertilizer damage
Only by using different fertilizers and concentrations according to different fertility periods and different climates can we effectively avoid fertilizer damage outside the roots. More precipitation concentration should be high, less precipitation concentration should be low, young period concentration should be low, tissue maturity concentration should be high.