生物炭对砒砂岩与沙复配土壤理化性状及辣椒生长的影响

为探究生物炭对砒砂岩与沙复配土壤肥力提升和作物生长的影响。通过盆栽试验,研究不同添加量的生物炭对辣椒生物学性状、产量以及复配土壤理化性状的影响。结果表明:复配土比例为1∶1时,A2处理使茎叶鲜质量、干质量增加81.4%、80.5%,单果长、单果茎粗增加15.1%、21.0%,土壤有效磷含量增加11.08 mg·kg-1,对土壤pH和全盐量影响不大。复配土比例为1∶2时,B2处理下果实鲜质量、干质量增加39.7%、40.2%,茎叶鲜质量、干质量增加28.1%、29.5%、根鲜质量、干质量增加35.0%、22.0%,单果长、单果茎粗分别增加12.1%、13.0%,单株结果数增加119.8%,产量最高且土壤pH和盐分变化不大。复配土为1∶5时,添加生物炭对辣椒生长发育和产量积累产生抑制。因此,该试验条件下,建议1∶1和1∶2的复配土生物炭添加量为2%,1∶5的复配土不建议施用生物炭。

Effect of Biochar on Physical and Chemical Properties of Glutinous Sandstone and Sand Compound Soil and Growth of Pepper

This research explored the effect of biochar on soil fertility and crop growth of compound soil formed by glutinous sandstone and sand.Through pot experiments,the effects and rules of different amounts of biochar on the biological characteristics,yield and physical and chemical properties of peppers were studied.The results showed that when the proportion of compound soil was 1∶1,the fresh and dry quality of stems and leaves in A2 treatment increased by 81.4% and 80.5%,the length and stem thick of single fruit increased by 15.1% and 21.0% respectively,and the available phosphorus content of soil increased by 11.08 mg·kg-1,it had little effect on soil pH and total salt content.When the proportion of compound soil was 1∶2,the fresh and dry quality of fruits in B2 treatment increased by 39.7% and 40.2%,the fresh and dry quality of stems and leaves increased by 28.1% and 29.5% respectively,and the fresh and dry quality of roots increased by 35.0% and 22.0%,the length and stem thick of single fruit increased by 12.1% and 13.0%,number of results per plant increased by 119.8%,the yield was the highest while soil pH and salinity changed little.When the compound soil was 1∶5,the addition of biochar inhibits the growth and yield accumulation of pepper.Therefore,it was recommended that the amount of biochar added in the compound soil of 1∶1 and 1∶2 was 2%,and the compound soil of 1∶5 was not recommended to apply biochar,under the conditions of this experiment.