BB fertilizer, also known as formula fertilizer, is a high-quality and high-efficiency compound fertilizer composed of three or more single-grain fertilizers, namely nitrogen, phosphorus, potassium or other elements. As a physicochemical technology of formula fertilization, BB fertilizer is conducive to accelerating the popularization and application of formula fertilization technology in rural areas.

Places that should be paid attention to during fertilization
1. Pay attention to moisture-proof to prevent nitrogen volatilization or agglomeration.
2. Pay attention to uniformity. If there is delamination, it should be shaken up and down; in case of agglomeration, use a wooden stick or a wooden hammer to smash it before use, otherwise the unevenness will affect the growth of crops and even burn the crops.
3. Note that the fertilizer and the seeds should not be in direct contact to prevent the fertilizer from burning the seedlings.
4. Pay attention to maintaining fertilizer. After applying BB fertilizer in paddy field, do not put water in series or flood irrigation to prevent nutrient loss. The cold soaked fields should be applied multiple times to prevent the leakage and waste of nutrients.
5. Pay attention to fertilizer efficiency. For “early-growing” paddy fields, 15% of the application amount per acre should be applied after drying the fields. For “high-yield” paddy fields, when applying surface fertilizer, 5-10 kg of ammonium bicarbonate or ammonium chloride should be topdressed per acre, which can better promote the early growth of rice.
6. BB fertilizer is a chemical fertilizer. It is an inorganic fertilizer and must be used in conjunction with organic fertilizers in production.