Vegetable cultivation in greenhouses is a high-input, high-output production method. The reporter learned in the process of interviewing in the countryside that there are some misunderstandings in the fertilization, which affects the value of the seed, so I will remind everyone here. Pay attention to the scientific fertilization .  

　　 Do not apply chicken manure without decomposing. Vegetable growers often use unfertilized chicken manure or other unfertilized organic fertilizers to easily burn roots. The space pepper cultivated by Zhang Guoxin in Fengyi Village, Hualong Town, this fall , is because there is no decomposed cake fertilizer when it is cultivated . As a result, the base of the stem of the plant was burned and rotted, causing root rot of the stem, and a large number of plants died of wilting. From farm just out of fresh chicken manure, which is relatively high carbon and nitrogen, must accumulate fat for some time in the dug pit (the manure pit the more light the better), the high-temperature fermentation maturity before use.

Second, avoid fertilizer base fertilizer reused. Cheap due to trace elements, many farmers in the application of basal fertilizer, people are happy joy mixed with trace elements, in fact, the effect is not good, but also increases the cost. For example, the elements iron fertilizer applied to the soil, since the air oxidation of iron is easily converted into the soil hardly soluble trivalent iron ions and lose effectiveness. If foliar spray is used, use 0 . 1 % to 3 % of ferrous sulfate solution is evenly sprayed on the vegetable leaf surface, which is easily absorbed and has a good effect. It is recommended to apply trace elements to the soil to spray liquid micro-fertilizer.

Three bogey containing chlorinated fertilizer. Because of the cheap price of potassium chloride, many vegetable farmers use it in greenhouse vegetables. This is not true because chloride ions can reduce the starch and sugar content of vegetables. The decline in the quality of vegetables. The yield is reduced; and the chloride ion remains in the soil, which can lead to acidification of the soil, which is likely to cause decalcification of the soil and cause soil compaction. Potassium chloride should be applied as potassium sulfate. Especially avoid chlorine beets, watermelon, potatoes and other vegetables category.

Four bogey yl potash fertilizer less. Usually around the flowering of potash needs more vegetables, then gradually reduce. It is recommended that in addition to the large amount of organic fertilizer used in the base fertilizer, it is necessary to re-apply potassium fertilizer, which can be applied in depth to facilitate the absorption and utilization of vegetable roots. At the same time, combined with the application of potassium fertilizer before and after flowering, the demand for potassium fertilizer in vegetables can generally be reached.

Five bogey use diammonium phosphate as top dressing. Diammonium phosphate is a binary compound fertilizer containing 18 % nitrogen and 46 % phosphorus pentoxide . Vegetables require large amounts of nitrogen and potassium and require less phosphorus. For example, eggplant requires a ratio of NPK to 3 : 1 : 4 , cucumber is 5 : 2 : 6 , tomato is 7 : 2 : 8 , and diammonium phosphate contains 18 % nitrogen and 46 % phosphorus , excluding Potassium, so it is not advisable to apply more diammonium phosphate in the greenhouse , otherwise the accumulation of available phosphorus in the soil will inhibit the absorption of potassium fertilizer.

Phosphorus is easily fixed by chemical reaction with calcium, iron and aluminum in the soil and is difficult to use. It is recommended to apply the phosphate fertilizer as base fertilizer or foliar spray.

Six bogey of ammonium sulfate, ammonium bicarbonate. Ammonium sulphate is a physiologically acidic fertilizer. It will increase the acidity of the soil and destroy the soil structure after application . Therefore, in addition to the proper application in alkaline soil, it is best not to use a large amount of ammonia after the application of ammonium bicarbonate in neutral and acidic soils. Gas, when the ammonia reaches a certain concentration, it can cause the burning of leaves, which is unfavorable for the growth of vegetables , especially in the case of poor wind shed in the winter greenhouse.