Reasonable selection of calcium fertilizer greenhouse soil pH value of 6.5 ~ 7.5, should be applied alkaline or neutral fertilizers, such as slaked lime, calcium nitrate, etc., and less acidic or physiologically acidic substances. Ordinary phosphate fertilizers such as superphosphate, calcium magnesium phosphate and heavy superphosphate are important sources of calcium fertilizer. Both bone powder and grass ash contain a certain amount of calcium, which is also a source of calcium that can not be ignored. In order to prevent calcium deficiency in the early stage of vegetable growth, base calcium fertilizer can be used. In the sheds that have been planted for many years, 2,000 to 3,000 kilograms of decomposed organic fertilizer is applied to the acre, and 30 to 45 kilograms of superphosphate is added. Scientifically carry out fertilization of vegetable greenhouses with heavy acidity, and adopt the method of re-application of base fertilizer, that is, 100 kg of wood ash per mu or 50 kg of slaked lime. The specific method is to mix organic fertilizer with slaked lime or ash, and apply it evenly on the ground surface. , ploughing into the ground. For growing vegetables, especially into the vigorous growth period, calcium nutrition can be supplemented by topdressing. Generally, 40-60 kg of slaked lime is used per mu, and the amount of lime in sandy soil is appropriately reduced. 80 kg of slaked lime or 50 kg of ash can also be peeled off, one end of the membrane is opened, and a groove of 10 cm deep is opened. The fertilizer is applied to the bottom of the ditch and watered, and the cover film is covered after underwater seepage. It can also be combined with disease-preventing spray, supplemented with calcium by foliar topdressing, and the topdressing concentration is generally 0.3% to 0.5%. Generally, 0.1% to 0.2% of calcium nitrate or 1% of superphosphate can be sprayed, sprayed once every 15 days, and even sprayed 3 to 4 times, the effect is better. Disclaimer: Some articles on this website are transferred from the Internet. If legal rights of third parties are involved, please inform this website. phone Maxillofacial Plate,Maxillofacial Titanium Plate,Titanium Maxillofacial Plates,X Maxillofacial Plates Medton Medical , https://www.medtonmedical.com