Q: what is soil testing and formulated fertilization?
A: Soil testing: testing soil nutrient content;
Formula: put forward scientific fertilization measures (ratio, dosage, period and method) according to crop fertilization law, soil fertility and fertilizer utilization rate
Q: can rice use nitrate nitrogen? No.
A: nitric oxide is easy to leach.
Q: what are physiological acid fertilizers?
A: Ammonium sulfate, ammonium chloride, etc. should be used in northern alkaline soil.
Q: Characteristics of granulating production line:
A: 1. The design of spiral section of mixing section is reasonable and unique, the mixing is uniform, and the feeding and discharging is fast
2. Computer automatic batching / mixing / packaging in one, using the cage feeding mode, small area, less labor, less investment.
3. The whole equipment is made of stainless steel, corrosion resistance, long service life.
4. The following are pictures of applicable granulation production line:

Q: what is chemical acid fertilizer?
A: Superphosphate is suitable for alkaline soil in North China.

Q: what is chemical alkaline fertilizer?
A: Phosphorus magnesium fertilizer, ash.
First of all, they can not be mixed with farmyard manure, ammonium nitrogen fertilizer and straw ash as mulching fertilizer.

Q: can urea be watered immediately?
A: No, urea is easily lost.
Do not water immediately after fertilization, it can be converted into ammonium bicarbonate in 2-3 days in summer, and the effect of re watering is better.

Q: can ammonium bicarbonate be applied to the soil surface?
A: No, it should be covered with soil. Due to the application of ammonium bicarbonate on the soil surface, most of the nutrients will volatilize into the air, and the utilization rate is very low. More details, go to https://organicfertilizerplants.com/

Q: how to improve the utilization rate of phosphate fertilizer?
-A: 1. Mixed organic fertilizer.
2. Concentrated application as base fertilizer.
3. Priority should be given to winter crops and legumes;
4. Combined application of nitrogen, phosphorus and potassium.
5. Sandy soil and dry land are preferred;
6. After effect of rational utilization of phosphate fertilizer.

Q: can urea be absorbed by crop roots?
A: after urea is converted into ammonium nitrogen, it can be absorbed by crops.

Q: why is the application of potassium sulfate compound fertilizer easy to cause soil hardening?
A: the main reason is the formation of CaSO4 (gypsum).