Greenhouse vegetables fertilize six taboos

Greenhouse vegetable cultivation is a kind of high-input, high-yield production method. There are some misunderstandings in the fertilization of vegetable growers, which affects the planting efficiency. Therefore, everyone here is reminded to pay attention to scientific fertilization.

One bogey application is not cooked chicken manure.

Farmers often use rotten chicken manure or other unripe organic fertilizers to burn roots. The fresh chicken manure that has just come out of the aquaculture plant has a high carbon and nitrogen content. It must be accumulated in the excavated fertilizer pit for a period of time (the fattening pit should be as shallow as possible) and the fermenting agent should be added after high-temperature fermentation and decomposed.

Second bogey base fertilizer reuse micro-fertilizer.

Due to the low price of trace elements, many vegetable farmers like to incorporate a variety of trace elements in the application of basal fertilizers. In fact, such effects are not good and increase the cost. For example, iron-containing fertilizers are applied to the soil because the iron is easily oxidized by the air in the soil and converted into insoluble ferric ions to lose its fertility. If the foliar spraying method is used, the 0.1%-3% ferrous sulfate solution is evenly sprayed on the leaf surface of the vegetables, which is easy to be absorbed and the effect is good. It is recommended to change the application of trace elements in the soil to foliar liquid microelement fertilizer. .

Three avoid application of chlorinated fertilizer.

Because of the low price of potassium chloride, many vegetable farmers use it in greenhouses. This is incorrect. Because the chloride ion can reduce the starch and sugar content of the vegetables, the quality of the vegetables will be reduced and the yield will be reduced. Moreover, the residual of chloride ions in the soil will lead to acidification of the soil, which will easily lead to decalcification of the soil and cause soil compaction. Therefore, potassium chloride should be changed. ** Potassium. In particular, dishes such as sugar beets, watermelons, and potatoes are not allowed.

Four avoid base fertilizer use less potassium.

Vegetables generally require more potassium before and after flowering and gradually decrease thereafter. It is suggested that in addition to the large amount of organic fertilizer used in basal fertilizer, potassium fertilizer should be reused, and potassium fertilizer can be deepened to facilitate the absorption and utilization of vegetable roots. At the same time, combining topdressing with potash before and after flowering, the demand for potassium fertilizer from vegetables can generally be achieved.

Five avoid using diammonium phosphate as top dressing.

Diammonium phosphate is a binary compound fertilizer containing 18% nitrogen and 46% phosphorus pentoxide. Vegetables need a lot of nitrogen and potassium, and they need less phosphorus. For example, the ratio of NPK required by eggplant is 3:1:4, cucumber is 5:2:6, tomato is 7:2:8, and diammonium phosphate is 18% nitrogen and phosphorus is 46%. Potassium, so in the greenhouse should not be more diammonium phosphate, or soil available phosphorus accumulated too much, can inhibit the absorption of potassium. Phosphorus easily reacts with calcium, iron, and aluminum in the soil and is immobilized, making it difficult to use. It is recommended to use phosphate fertilizer as base fertilizer or foliar spray.

Six avoid application of ammonium, ammonium bicarbonate.

* Ammonium is a physiological acid fertilizer, which will increase the acidity of the soil and damage the soil structure after application, so it is best not to use it in neutral and acidic soils except for proper application in alkaline soils. Volatile ammonia generated after the application of ammonium bicarbonate produces a large amount of ammonia, when the ammonia reaches a certain concentration, can cause burning of leaves, unfavorable for the growth of vegetables, especially in the winter when the greenhouse is not smooth under the circumstances of not using ammonium bicarbonate.