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三、人工合成土壤用的肥料人工合成土壤用的基质材料,绝大多数不含有植物养分或所含的养分很难被植物吸收。故必须由人工配进去。配进去的养分需要有速效态和缓效态。这样,既能供给植物近期需要,也能供给植物长期需要。配制人工合成土壤通常使用以下肥料。 1.作速效养分用的肥料。速效氮肥: 尿素CO(NH_2)_2 含氮46％。易溶于水。当尿素与湿润的基质接触,经微生物作用,水解为碳酸铵,产生暂时的弱碱性。一般在20℃的湿润条件下,4—5天即可全部转化为碳酸铵。当通气良好时,一部分NH_4~+被微生物氧化成NO_3~-,又使产生酸性。最终基质的酸碱度不
Third, synthetic soil fertilizers Synthetic soil with matrix material, the vast majority do not contain plant nutrients or nutrients contained in plants is difficult to be absorbed. It must be manually assigned to go. With nutrients into the need for fast-acting and slow-acting state. In this way, both the immediate supply of plants and the long-term supply of plants can be provided. The following fertilizers are commonly used in the preparation of synthetic soils. 1. For quick-acting nutrients used in fertilizer. Available nitrogen fertilizer: urea CO (NH_2) _2 nitrogen 46%. soluble in water. When the urea and the wet matrix contact, by the role of microorganisms, hydrolyzed to ammonium carbonate, resulting in temporary weakly alkaline. Generally 20 ℃ humid conditions, 4-5 days can be fully converted to ammonium carbonate. When the aeration is good, part of the NH_4 ~ + is oxidized by microorganisms to NO_3 ~ - which in turn makes it acidic. The final matrix pH is not