What are the main raw materials for producing NPK fertilizer in China?

Coal or natural gas, air, water, natural gas, coal.

2. Raw materials:

The main raw materials for phosphate fertilizer production are phosphate rock and sulfuric acid.

3. Potash raw materials:

Potassium and some well water, lake water and brine containing potassium are also raw materials for potash fertilizer.

Extended data:

Other uses:

Adjust the number of flowers

In order to overcome the problem that apple is in its infancy, spraying 0.5% urea aqueous solution twice on the leaves 5-6 weeks after flowering can increase the nitrogen content in the leaves, accelerate the growth of new shoots, inhibit the differentiation of flower buds, and make the annual flowering amount appropriate.

blossom and fruit thinning

The floral organs of peach trees are sensitive to urea, but nectarines react slowly. Therefore, the experiment of thinning flowers and fruits of peach and nectarine with urea was carried out abroad. The results show that peach and nectarine need a large concentration to sparse flowers and fruits to show good results. The optimum concentration is 8%- 12%, and the purpose of thinning flowers and fruits can be achieved within 1-2 weeks after spraying.

However, under different land conditions, the responses of different periods and varieties need to be further tested.

Rice seed production

In hybrid rice seed production technology, in order to improve the outcrossing rate of parents and increase the seed production of hybrid rice or sterile lines, red toxin is generally sprayed on the female parent to reduce the degree of neck entanglement or make it completely extracted; Or spray parents to adjust growth and synchronize flowering. Because gibberellin is expensive, the cost of seed production with it is high.

People use urea instead of gibberellin for experiments, and use 1.5%-2% urea at full heading stage and heading stage, and its breeding effect is similar to gibberellin without increasing plant height.

control of insect

The mixture of urea, washing powder and clear water at a ratio of 4: 1:400 can control aphids, red spiders, cabbage caterpillars and other pests on fruit trees, vegetables and cotton, and the insecticidal effect is over 90%.

Urea iron fertilizer

Urea forms chelated iron with Fe2+ in the form of complex. This organic iron fertilizer has low cost and good effect on preventing iron deficiency chlorosis. In addition, adding 0.3% urea when spraying 0.3% ferrous sulfate on leaves is better than spraying 0.3% ferrous sulfate alone.

References:

Baidu encyclopedia-nitrogenous fertilizer

References:

Baidu encyclopedia-phosphate fertilizer

References:

Baidu encyclopedia-potash fertilizer