According to the classification of fertilizer types, it is divided into nitrogen fertilizer, phosphorus fertilizer, potassium fertilizer, compound fertilizer, and new fertilizer. Nitrogen fertilizer: urea, including ammonium sulfate and calcium nitrate (mostly used in fruit trees). It seems that we haven't seen nitrogen fertilizer before, but in fact, the fertilizers we use now basically contain these things. Most compound fertilizers contain ammonia sulfate, ammonium chloride, and urea.

"The nutrient concentration is high, with urea nitrogen content of 46% and chicken manure nitrogen content of only 2%. Therefore, applying a bag of urea is equivalent to several carts of chicken manure.". "The effect is relatively fast. If nitrogen fertilizer is applied to corn on June 19th, urea will have an effect within four or five days.". But if organic fertilizer is topdressing, it takes a long time to take effect. 3. The solubility is relatively high. Nitrogen fertilizer is basically fully soluble, phosphorus fertilizer is partially slightly soluble, and some fertilizers are basically more than 90% molten.

Cooperatives increase grain production while increasing income. The most important thing is the application of fertilizers, mainly the use of chemical fertilizers. From the perspective of some farmers, they believe that fertilizer application is simple. Anyway, I can buy some things on the market and give them a try. In fact, this is a science, and there are many problems to be solved. Moreover, its application is related to the technical level and soil conditions. In particular, in many places where conservation tillage is implemented today, there are many issues to be solved regarding the application amount, use methods, and precautions of chemical fertilizers. Next, we will introduce some basic knowledge of chemistry, especially the properties of some commonly used fertilizers that we encounter in agricultural production. We all know that fertilizers purchased on the market include compound fertilizers, urea, potassium fertilizers, and trace elements. Normal crops require multiple nutrients. In fact, according to normal terms, there should be 17 types, and one of these 17 types is nickel, which some people believe is necessary. Just like people eat food, we need to eat flour, rice, and white flour. The same goes for plants. He also needs to eat some food. What does he eat? "We all eat organic substances, while most of what crops and plants eat is inorganic, in the form of ions.". So urea is included here. In fact, plants are not fully able to eat urea. It has to be converted into ammonia form and then absorbed by plants, including other factors such as phosphorus and potassium.

Advantages of chemical fertilizers From the perspective of nutrient cycling, all nutrients contained in organic fertilizers are nutrients that were originally within the agricultural cycle. The main advantage of chemical fertilizers is that they can increase the total amount of nutrients in the agricultural cycle. (1) High nutrient content Urea contains 46% nitrogen, ammonium nitrate 34% nitrogen, and ordinary superphosphate 14% to 18% phosphorus. The nitrogen content of pure horse manure is only 0.4-0.5%, and the phosphorus content is 0.2-0.35%. 1Kg of ammonium sulfate is equivalent to 30-40Kg of human feces and urine, 1Kg of ordinary superphosphate is equivalent to 60-80Kg of existing fertilizer, and 1Kg of potassium sulfate is equivalent to about 10Kg of plant ash. Therefore, the amount of fertilizer used per unit area is small, facilitating transportation and saving labor. (2) Fast fertilizer effect Chemical fertilizers are water-soluble or weakly acid soluble, and can be quickly absorbed and utilized by crops after being applied to the soil. The fertilizer effect is fast and significant. Crops that grow short and small will flourish after applying nitrogen fertilizers such as ammonium sulfate. (3) Abundant raw materials Chemical fertilizers are produced using natural mineral resources as raw materials, such as oil, natural gas, coal, phosphate rock, etc. These raw materials are abundant and can be exploited in large quantities. (4) Adopt industrial production Due to the abundant raw materials for producing fertilizer, it can be industrialized on a large scale, without seasonal restrictions, with large output and low cost. (5) Save transportation and labor Due to the high nutrient content and low dosage of fertilizer, the cost and labor required for transportation and application are relatively saved. (6) Easy to save and long-lasting Fertilizers are smaller in size and have stable nutrients compared to farmyard fertilizers. They are easy to preserve, have a long shelf life, and are not prone to deterioration.