生物炭用量对烟苗生长的影响

为揭示生物炭对烟苗及根系生长的影响,采用盆栽试验,在土壤中添加不同用量的生物炭,并测定了不同处理条件下烟苗的干物质积累量,氮、磷、钾含量(质量分数),以及烟苗根系形态及根系活力。结果表明:与对照相比,当生物炭施用量为1%时,对烟苗的促生效应最佳,烟苗干物质积累量增加了28.5%;当生物炭施用量超过4%时,烟苗生长反而受到抑制,干物质积累量下降了7.1%。同时,随着生物炭施用量的增加,烟苗根系体积、根系面积及根总长均呈现出增加趋势。当生物炭施用量为3%时根总长最大,增加了10.5%;当生物炭施用量为4%时根系体积最大,增加了238.7%。3%生物炭用量对烟苗生长具有促进作用,而更高用量生物炭则抑制了烟苗的生长。 

Influences of Biochar Application Rate on Tobacco Seedling Growth

A pot experiment was carried out to study the influences of biochar on the growth of tobacco seedling and root system.Biochars of different rates were added into soil,and the dry matter accumulation and nitrogen,phosphorus,potassium contents in tobacco seedling and the morphology and vitality of seedling root system at different biochar rates were determined.The results showed that comparing with the control,the dry matter accumulation of tobacco seedlings increased by 28.5% at a biochar application rate of 1%,however it decreased by about 7.1% and tobacco seedling growth was inhibited when the application rate was above 4%.With the increase of biochar application rate,the volume,area of the root system and total length of roots raised.At the application rate of 3%,the total length of roots reached its maximum and increased by 10.5%.At the application rate of 4%,the volume of roots reached its maximum and increased by 238.7%.Under the conditions of this experiment,the biochar application rate of 3% promoted the growth of tobacco seedlings,while over that application rate,the growth of tobacco seedlings would be inhibited.