Knowledge of fertilizer(Three)
What is the utilization rate of chemical fertilizer?
Why does the chemical fertilizer burn seedings?
The reason is that the amount of chemical fertilizer is too large or the seed is too close to the root.
Principle: Fertilization increased the concentration of salt in the soil water, or chemical fertilizer contact with root directly,so lead to the concentration of soil nutrient close to root is too high, in line with the principle of water flows from low to high concentration, the water in the root outflow into the soil, the water outflow of seeds or seedlings root,then causing seedling.
Does the urea can be watered immediately after applied?
No,because urea is easily lost.
Do not water immediately after fertilization,in the summer,it can be converted to ammonium bicarbonate after 2-3 days, then water it will be better.
What are the reasons for the yellowing of wheat seedlings?
1. Straw return (the most common situation).
2, some diseases of wheat or rotten roots.
3, the wheat seeded deeply, the seedling weak.
Does rice use potassium sulfate compound fertilizer or potassium chloride compound fertilizer?
Under the conditions of flooding, SO42- is reduced to H2S, which poisons rice roots and makes it black.Therefore, the rice uses the potassium chloride compound fertilizer.