First, in China, irrigation fertilization is widely used in winter, mainly in greenhouse. In this period, due to weak sunlight, low temperature and low ground temperature, although there is an external heat source, it still can not meet the needs of normal plant growth. The low activity of active bacteria in soil and the underdeveloped root system of plants all lead to poor absorption of fertilizer and poor effect of flushing fertilization. Therefore, improving plant root activity and increasing plant root growth are the necessary means of flushing and fertilization. For example, adding a small amount of synergist sodium, a-naphthalene acetate, synergist amine (DA-6) in flushing fertilization can promote plant vitality, promote root growth, increase fertilizer absorption, and make fertilizer efficiency fast, high and significant.
Second, a variety of fertilizers are mixed and washed. Because our country's agriculture is characterized by small-scale peasant economy, that is, farming, sowing and fertilization are carried out separately by each household, the situation of soil fertilizer is very different, and it is not easy to popularize and apply a certain kind of fertilizer uniformly.
Third, master the nutrient characteristics of various crops. For example, leafy vegetables and grass crops need more nitrogen, so we should flush more nitrogen fertilizer; Legumes and eggplants need more phosphorus and potassium. We should apply more phosphorus and potassium fertilizer. Suit the medicine to the case, get twice the result with half the effort and improve the fertilizer effect.
Fourth, the scientific rotation of fertilizer, a small amount of fertilizer for many times. In particular, greenhouse crops are usually watered frequently because they mainly rely on irrigation and water application. In this way, a small amount of fertilizer can be washed and applied for many times. For example, leek can be washed and applied once per cut, and eggplant fruits such as cucumber, eggplant and pepper can be washed and applied once per pick. In addition, large elements, trace elements and plant root growth promoters should be reasonably matched in each rush application.
Fifth, note that several fertilizers cannot be mixed and washed, otherwise the effect will be reduced or there will be no effect. For example, ammonium bicarbonate cannot be mixed with strong acid fertilizer, amino acid fertilizer cannot be mixed with humic acid fertilizer, and chelating agent shall be added when phosphoric acid fertilizer is mixed with zinc, manganese, iron, copper and other fertilizers.
