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由于土块在烟雾里熏,热度可使土块里的磷、钾养分变成被作物吸收的速效性养分,同时柴草在不充分的燃烧情况下,其中氮素转化成氨吸附于土块;加上柴草燃烧残物是草木灰,所以熏土是含速效氮、磷、钾的肥料。一般说,熏土中含氮素0.18%、磷0.13%、钾0.40%,其中含有效氮约0.02%左右,而一般土壤中仅含有速效氮0.0005%左右。熏土含有机质极少,与堆肥、厩肥等有机肥性质不同,不能代替有机肥料。施时要打碎,不宜施在土壤表面。
Because of soil smoked in the smog, the heat can make the soil phosphorus, potassium nutrients into quick-acting nutrients absorbed by the crop, while the firewood in the case of inadequate combustion, which nitrogen into ammonia adsorbed to the soil block; With straw burning residue is ash, so smoked soil is available nitrogen, phosphorus, potassium fertilizer. In general, the smoked soil contains 0.18% of nitrogen, 0.13% of phosphorus and 0.40% of potassium, which contains about 0.02% of available nitrogen, whereas conventional soil contains only about 0.0005% of available nitrogen. Soil contains very few organic matter, and compost, manure and other organic fertilizer different nature, can not replace organic fertilizer. Shi Shi to break, should not be applied to the soil surface.