Abstract:

In order to provide theoretical basis for reasonable use of pyroligneous in agricultural facilities, effects of continuous application of pyroligneous acid and the mixture with charcoal in greenhouse soil on yields of Brassica chinensis var. Oleifera and Brassica parachinensis and change of soil fertility were studied, with soil salt content, aggregates composition and content of soil nutrient as the index of field plot experiments. The results showed that: the application of pyroligneous acid and the mixture with charcoal decreased content of soil total salt from 6.8% to 33.3%, 4.5% to 18.2%, respectively, was as follows: pyroligneous>the mixture>control. Increased proportion of soil aggregation composition about classified of 2-0.25 mm to change soil structure better by improving soil aeration and soil permeability than before was as follows: the mixture>pyroligneous>control. Also, can adjusted pH value, increased organic matter and rapidly available phosphorus content. At last, increased yield of test vegetables from 13.4% to 21.7%, 32.6% to 35.0%, respectively, was as follows: the mixture>pyroligneous>control.