| Biochar contains porous structure, which has a certain surface properties, and can adopt soil nutrient ions, and influent pH and conductivity. Biochar as a soil additive can produce certain soil nutrient In order to research the influence of biochar on different soil, which includes acid brown soil, brown soil, and cinnamon soil, aimed to provide scientific basis for biochar used on soil. The main results were as follows:1Pyrolysis temperature can reduce a certain extent biochar production rate. As the pyrolysis temperature reduced, production rate was declined. When pyrolysis temperature increased from400degrees to600degrees, biochar from Celsius, cow dung production rate was reduced by8.5%, peanut straw biochar was reduced by12.5%. Pyrolysis temperature also can improve the pH of biochar. With the increase of pyrolytic temperature, biochar carbonate content, pH was increased.The pH value was higher pH0.72units when peanut straw biochar under the pyrolysis temperature condition from400℃to600℃。Heat preservation time on biochar mainly by the influence of affect carbonized degree of biomass material, will affect the production rate of the biochar and pH. The influence of the heat preservation time on biochar production rate is only at the beginning of the carbonized. Under the condition of500℃pyrolysis, peanut straw biochar production rate was10min shorter than400℃. Biochar prepared from straw can increase more than0.3pH when the condition of500℃,10min to20min.2Biochar can inhibit brown soil, acid brown soil and ammonium nitrogen leaching. Wheat straw biochar respectively increased leaching solution of ammonium nitrogen content of14.6%,38.8%in the first leaching. Biochar for brown soil ammonium nitrogen leaching has promoting effect, corn and wheat straw biochar respectively improved brown soil ammonium nitrogen content for17.1%,39.3%. Biochar in acid brown soil on nitrogen and nitrate nitrogen effect is different from brown soil.With the increase of biochar content, acid brown soil nitrogen content increased gradually, ammonium nitrogen decreased gradually too. Brown soil and acid brown soil has roughly the opposite regularity. This may be due to different soil pH.3Biochar can improve the leaching of soil phosphorus removal. With the increase of biochar content, leaching p content was gradually increased. Leaching for the first time, the corn and wheat straw biochar, both improve the brown soil41.6%,35.6%of phosphorus removal. Effect of biochar on the removal of acid brown soil is greater than the effect on brown soil and the maximum relative content is9.3times. Acid brown soil of available p content has increased1.89times,3.18times,3.71times.4Potassium content of biochar are positively correlation with conductivity. Adding biochar in soil, the potassium content in leaching solution multiplied. As leaching times increased, maize straw bichar in leaching solution of potassium content was increased8.8times,5times,9.3times,10.75times,11.75times,10.25times,10.4times,9.6times and other soils have the same rule.5Biochar may has influence on rape growth.In brown soil,when maize straw biochar content was lower than6%, the increase of biomass was increased, by11.8%,11.8%and74.6%. Maize straw biochar on brown soil, acid brown soil also has promoting effect. When wheat straw biochar content is1%, the canola plants growing is the best. Once the biochar content is over3%, the growth of rape was inhibited. High content of biochar is not good for crop growth. |
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