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无土栽培属于高科技领域,在国外有较大的面积和较强的发展趋势。在国内也有很多先进典型,只是因为使用的营养液成本高,实际操作中投资多,技术难度比较大,一般不容易掌握,近期难以在中国大面积推广。特别是无土栽培使用的营养液中硝酸盐含量超标,很难达到绿色食品A级标准。不符合环保和绿色食品的发展要求。目前唐山古冶区在有机丰收型无土栽培中,使用的主要是液态肥料(沼液),用沼气地这个生物链把高新技术的无土栽培与简易的生产设备,低成本
Soilless cultivation belongs to the field of high-tech, in foreign countries have a larger area and strong development trend. There are many advanced models in the country just because of the high cost of nutrient solution used, more investment in actual operation, more technical difficulty and generally not easy to grasp. It is difficult to popularize in large scale in China in the near future. In particular, the use of soilless culture medium nitrate content exceeded, it is difficult to achieve green food Grade A standard. Not in line with the development of environmental protection and green food requirements. Currently Tangshan Guye District in organic harvesting type soilless culture, the main use of liquid fertilizers (biogas), biogas to the biological chain of high-tech soilless cultivation and simple production equipment, low-cost