The Effect of Corn Straw Carbonization Products on the Growth of Rapeseed Seedlings
[Objective]To determine the amount of biochar in the cultivation substrate and use biochar to replace the use of a scarce resource-grass carbon.[Method]The composite matrix was formed by mixing corn straw charcoal(biochar),peat,organic fertilizer and active bacteria in four different ratios(CK,8∶1.5∶0.5)(treatment①,7∶1∶1.5∶0.5)(treatment ②,6∶2∶1∶5∶0.5)(treatment ③,5∶3∶1.5∶0.5).The seedling traits,water content,chlorophyll content,crude protein,reducing sugar and nitrogen,phosphorus and potassium content were deter-mined.[Result]In terms of rapeseed growth,treatment ①(10％biochar supplemental)had the best growth,plant height,diameter and leaf size grew more neatly;the content of chlorophyll in treatment ①(10％biochar content)was the highest(1.37 g/kg),which was significantly higher than that in CK group;the crude protein content of the four treatments was relatively high,the crude protein content of treatment ① and② was higher than that of CK group,and the crude protein content of treatment ③(30％biochar addition)was slightly lower than that of con-trol group;the reducing sugar content of each treatment decreased significantly with the increase of biochar application amount,and the reduc-ing sugar content of control group was the lowest,and that of treatment ① was the highest,which was 68％higher than that of control group;the content of P in all treatments was lower,the content of N and K was relatively higher,and the content of nitrogen,phosphorus and potassium in rape was not significantly different.[Conclusion]The matrix formula of 70％peat+10％biochar+15％organic fertilizer+5％active bacteria has the best agricultural effect.Application of 10％biochar in the substrate is ideal,and a small amount of peat can be replaced in production and life.
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