生物炭对大白菜幼苗生长的影响

Effect of Biochar on Growth of Brassica campestris L. ssp. pekinesis(Lour) Olsson

以2个大白菜品种为试材,在常规育苗基质中添加不同比例的花生壳生物炭或玉米秸秆生物炭,研究生物炭对大白菜幼苗生长的影响。试验结果表明,生物炭添加有助于提升基质的通气性,与常规育苗基质相比增幅为2.1%~42.1%,显著提升了C/N和速效钾含量,增幅分别为23.9%~131.2%和48.8%~297.2%,同时,生物炭添加降低了基质碱解氮与有效磷含量,降幅分别为10.4%~44.8%和7.1%~20.8%,基质毛管孔隙度降幅为14.0%~19.6%。在花生壳生物炭与常规育苗基质等体积比混合处理中,大白菜幼苗株高、茎粗、叶绿素含量、植株鲜干重及壮苗指数等最高,长势最佳,但出苗率最低。

A pot experiment was carried out to study the effects of biochar additions on seedling growth of two Chinese cabbage cultivars (Brassica campestris L. ssp. pekinesis(Lour)Olsson;Cultivars Xiayang Zao 50 and Jinnong Rekang Wang). Compared with conventional nursery substrate, additions of biochar significantly increased porosity, C/N ratio, and available potassium by 2.1%~42.1%, 23.9%~131.2%, and 48.8%~297.2%, respectively, leading to greater growth of the seedlings. However, biochar applications caused alkali hydrolyzable nitro-gen, available phosphorus, and capillary porosity decline by 10.4%~44.8%, 7.1%~20.8%, and 14.0%~19.6%, respectively, which might re-sult in a negative impact on seedling emergence rates. Peanut shell biochar mix with conventional nursery substrate at equal volume showed the greatest values in seedling height, stem diameter, chlorophyll content, fresh weight, dry weight and robust seedling index, but the lowest seedling emergence rate.