Matters needing attention for fertilization of flowers in greenhouse in spring

Spring is also the key period for fertilization of flowers in greenhouse, so we need to pay attention to matters needing attention in the process of fertilization of flowers in greenhouse in spring. How to apply fertilizer scientifically? Next, I would like to introduce to you the matters needing attention in spring fertilization of flowers in the greenhouse.

Greenhouse flowers

With the increase of fertilizer application of flowers in greenhouse, some problems will appear in the process of fertilization: first, excessive fertilization increases the concentration of soil solution, and flowers reverse osmosis and root injury; second, the partial application of chemical fertilizer, especially nitrogen and phosphate fertilizer, causes the imbalance of flowers' nutrition; third, urea and ammonium bicarbonate applied at low temperature are difficult to transform into nitrate nitrogen, and flowers are forced to absorb ammonium nitrogen, resulting in ammonium poisoning. Fourth, shallow application of urea and ammonium bicarbonate will lead to ammonia volatilization and damage the stems and leaves of flowers. In order to improve the fertilization level of flowers in greenhouse, the following points should be paid attention to in technical links.

First, pay attention to the regulation and control of base fertilizer and topdressing in order to prevent excessive application of fertilizer at one time, flowers in the greenhouse should apply adequate base fertilizer and appropriate topdressing. The proportion of general base fertilizer should account for about 60% of the total fertilizer application, of which phosphate fertilizer can be increased to 70% due to slow decomposition. The topdressing amount of nitrogen fertilizer and potash fertilizer should each account for about 40%. The application amount of high-quality farm compost and barnyard manure should not exceed 5000 kg per mu. The application amount of high-quality organic compound fertilizer should not exceed per mu. 100 kilos.

Second, paying attention to the application of organic fertilizer can not only improve the soil structure, but also release the fertilizer effect steadily and slowly, and adjust the acidity and alkalinity of the soil. In addition to the fertilizer accumulated by farmers, the application of bio-organic fertilizer and refined Huimanfeng, Diledan and other active organic fertilizers should be vigorously promoted. This kind of organic fertilizer can supply a large number of elements and trace elements needed for flower growth, supplement organic matter, and improve soil fertilizer conservation and water storage capacity.

Matters needing attention for fertilization of flowers in greenhouse in spring

Third, pay attention to the depth of fertilization, flowers in the greenhouse because of the good degree of tightness, shallow fertilization or sprinkling fertilizer, it is very easy to make fertilizer volatilization, which not only affects the fertilizer efficiency, but also easy to produce ammonia harm. When topdressing, it must be applied in holes or strips, the depth should be more than 5 cm, and the root system of flowers and plants should be kept at a distance of about 10 cm.

Fourth, pay attention to the appropriate temperature topdressing nitrogen fertilizer, especially urea and ammonium bicarbonate, it is easy to be absorbed by flowers only when it is transformed into nitrate nitrogen, and the speed of transformation mainly depends on the temperature conditions. When the temperature in the greenhouse is lower than 15 ℃, the activity of nitrifying bacteria will be inhibited. Therefore, topdressing nitrogen fertilizer should be carried out around noon in sunny days, too early or too late will affect the effect of topdressing due to the decrease of temperature. Foliar spraying with 1% urea solution is recommended when the temperature is above 15 ℃.

Fifth, pay attention to the skillful use of compound fertilizer traditional fertilization habits are often excessive application of nitrogen fertilizer, phosphate fertilizer only pay attention to the benefits of the current season, serious shortage of potash fertilizer, and trace elements can not be replenished in time. In this way, some fertilizers have been applied several times more than needed, but the plant utilization rate is very low. Due to the low temperature and slow fertilizer effect in spring, improper application will lead to waste. On the other hand, the skillful application of high concentration, all-element compound fertilizer such as Prodan or Mengding microbial compound fertilizer has high water solubility, absorption rate and utilization rate, which is suitable for drip irrigation, sprinkler irrigation and foliar spraying, and the performance is stable.