Conferences and exhibition at an international agrochemicals event, that will feature 500 exhibitors and visitors from China, India, Japan, Canada, Europe, Latin America, Brazil. Representatives of manufacturers, traders, distributors, retailers, laboratories, consultants, government agents, logistics, with the objective of developing partnerships with local companies. Talks on Agriculture, pesticide registration, biological products, environment, enconomy, technology, reevaluation of pesticides......

(1) Unit chemical fertilizer It refers to one of the three main nutrients that only contain nitrogen, phosphorus, and potassium. It is also known as a simple fertilizer, such as ammonium sulfate, which only contains nitrogen, ordinary superphosphate, and potassium sulfate, which only contains potassium. (2) Multicomponent chemical fertilizer Refers to fertilizers that contain two or more of the three main nutrients, such as ammonium phosphate, which contains nitrogen and phosphorus. (3) Complete chemical fertilizer Chemical fertilizers contain multiple nutrients required for crop growth and development.

(1) Acid chemical fertilizer Acid fertilizers can also be divided into two types: one is chemically acidic, with its aqueous solution reacting acidic, such as ordinary superphosphate, and the other is physiologically acidic, which is neutral in the aqueous solution. However, after being applied to the soil, some of them are absorbed by the crops, while the other part is left in the soil, showing acidity, such as ammonium chloride, ammonium sulfate, and potassium sulfate. (2) Alkaline chemical fertilizer There are two types of alkaline fertilizers. One is chemical alkaline, and its aqueous solution exhibits alkaline reactions, such as liquid ammonia and ammonia water. The other is physiological alkalinity, where the aqueous solution is neutral, but after being applied to the soil, a portion that is not absorbed by the crop remains alkaline in the soil, such as sodium nitrate, calcium nitrate, and so on. (3) Neutral chemical fertilizer The aqueous solution of neutral fertilizers is neither acidic nor alkaline, and does not appear acidic or alkaline when applied to the soil. Therefore, it can be applied to any soil, such as urea.

(1) Quick-acting fertilizer After being applied to the soil, this chemical fertilizer is immediately dissolved in the soil solution and absorbed by the crops, achieving quick results. Most nitrogen fertilizer varieties, such as ordinary superphosphate in phosphate fertilizer, and potassium sulfate and potassium chloride in potassium fertilizer, are quick-acting fertilizers. Quick acting fertilizers are commonly used as topdressing and also as base fertilizers. (2) Slow acting fertilizer Also known as long-term fertilizers and slow-release fertilizers, these fertilizer nutrients exhibit a compound or physical state that can be slowly released over a period of time for continuous absorption and utilization by plants. That is, after being applied to the soil, these nutrients are difficult to be immediately dissolved by the soil solution, and require a short period of transformation before they can be dissolved to achieve fertilizer efficiency. However, the fertilizer efficiency is relatively persistent, and the release of nutrients in the fertilizer is entirely determined by natural factors, "It is not controlled artificially, such as calcium magnesium phosphate fertilizer, steel slag phosphate fertilizer, phosphate rock powder, dicalcium phosphate, defluorinated phosphate fertilizer, magnesium ammonium phosphate, calcium metaphosphate, etc. Some organic compounds include urea-formaldehyde, butylene diurea, isobutylene diurea, oxalamide, melamine, etc. Some contain additives (such as nitrification inhibitors, urease inhibitors, etc.) or add coated fertilizers, the former such as long-term urea, and the latter such as sulfur coated urea are listed as slow acting fertilizers.", Among them, long-term ammonium bicarbonate is the addition of ammonia stabilizer in the ammonium bicarbonate production system, which extends the fertilizer efficiency period from 30-45 days to 90-110 days, and increases the nitrogen utilization rate from 25% to 35%. Slow acting fertilizers are often used as base fertilizers.

Select some fertilizers based on the nature of the fertilizer. In particular, cooperatives should control the amount of fertilizer application based on the amount of straw reduction and the time of returning to the field, as applying more fertilizer will not increase production, but may also reduce production. Choose appropriate fertilizers based on soil types. Cooperatives in the eastern mountainous areas should choose controlled release fertilizers. High nitrogen fertilizers cannot be used on saline and alkaline lands in the west. Instead, sulfur based compound fertilizers can be used, followed by topdressing. Topdressing can achieve the goal of increasing production. When we conducted an investigation with webmaster Wang, we found that it was impossible to achieve a yield of one ton per mu of land without late fertilization. If one-time fertilization is selected, controlled release fertilizer should be selected. "The amount of fertilizer applied should not be too much or too little. Excessive fertilization may cause lodging, especially for rice, as long as the amount of nitrogen fertilizer is sufficient, and for corn, if the amount of fertilizer applied is insufficient and the fertilizer is removed at a later stage, the yield will be low.". Fertilization cannot be done early or late, neither can topdressing be done early or late. Like rice, if pursued early in the early stage, it grows particularly vigorously, and in the later stage, you will find that the yield will not be too high, but there are fewer grains on the ears. Fertilization should not be deep or shallow. Phosphate fertilizer should be applied deep and nitrogen fertilizer should be applied shallow, as nitrogen fertilizer is easy to volatilize. At the same time, consider the type of crop, such as Chinese cabbage, which has a shallow root system. If applied too deeply, it will not be able to reach the nutrients. Corn requires deep fertilization.