When is the best time to use chemical fertilizers and organic fertilizers?
We often say that organic fertilizers and chemical fertilizers have a good effect when used "in combination"! But it is not about mixing them together before use! Because commercial organic fertilizers mixed with chemical fertilizers, urea, and diammonium will undergo chemical reactions, which easily causes amino volatilization and rapid decomposition and melting, making them unusable.
Spread the organic fertilizer first and then the chemical fertilizer, or use the chemical fertilizer first and then the organic fertilizer! Whether applying by machine or by hand, it is best to "mix just before use" and use immediately!
Microbial fertilizer combined with chemical fertilizer and organic fertilizer gives the best effect! But to achieve the best fertilization effect, the following issues should be noted when applying them in combination.
Organic fertilizer takes effect slowly, so it should be applied in advance. Generally, it should be applied as a one-time base application before sowing or before planting. Before use, it is best to choose fully fermented and decomposed organic fertilizer. Applying it later as a topdressing is not as effective as using it as a base fertilizer.
Chemical fertilizer takes effect quickly. When used as a base fertilizer, apply it about one week in advance. When used as a topdressing, it should be applied before the crop's critical nutrient period or peak nutrient absorption period to meet its needs.
Microbial fertilizer can only exert its bacteria-inhibiting effect after multiplying in large numbers in the soil, so it should be applied early before planting to give it time to multiply and grow. It can be applied to the soil together with organic fertilizer, or applied in holes before planting or at planting.
The main role of organic fertilizer is to improve the soil, and it can also provide nutrients. Generally, organic fertilizer should be applied to the soil before crops are planted, so it should be combined with deep plowing to mix the organic fertilizer thoroughly with the soil and achieve the purpose of improving the soil. When soil problems are serious, use organic fertilizer containing humus, which can improve soil heavy metals, better improve the soil environment, balance nutrition, and increase soil aggregate structure.
In base fertilizer, because the nutrients in organic fertilizer are mainly phosphorus, potassium, and nitrogen, it should be used in combination with organic fertilizer and less chemical fertilizer should be applied. Phosphate fertilizer and potassium fertilizer can be applied once as base fertilizer. Because phosphate fertilizer has poor mobility, topdressing it later has very poor effect, so phosphate fertilizer should be applied to the soil as base fertilizer.
For topdressing chemical fertilizer, it is best to use fully soluble quick-acting fertilizer. After decomposition, this kind of fertilizer can be quickly absorbed by vegetables and has less impact on the soil.
Because microbial fertilizer is used in small amounts, it can be applied in a concentrated way in the planting hole or as a base application together with organic fertilizer. Later, the same microbial fertilizer can be topdressed multiple times to expand the bacterial community and improve phosphorus-solubilizing and potassium-solubilizing ability and disease prevention effect.Pay attention to application rate
Different crops in different growth stages require different amounts of fertilizer, so it should not be applied too much or too little. Fertilization should be based on the fertilizer ratio they need. At the same time, one more point should be noted: the nutrient elements in the soil should be taken into consideration, and overall planning should be done. It is best to conduct a soil test once and fertilize according to the soil test formula.