生物炭对岩溶区石灰土性质及作物生长的影响

以玉米(迪卡008)和大豆(开鲜9号)为供试材料,通过野外盆栽实验,设置5个处理,每个处理蔗渣生物炭材料分别以土壤质量百分比0(CK)、0.5%(T1)、1%(T2)、2%(T3)、5%(T4)添加,研究蔗渣生物炭对岩溶区石灰土性质及农作物生长的影响。结果表明:生物炭对石灰土p H和碱解氮均无显著影响,土壤容重显著降低,提高了土壤有机碳、全氮、速效磷和速效钾的含量;与对照相比,玉米组和大豆组T2、T3、T4处理的土壤有机碳含量分别显著增加了53.01%、96.77%、237.03%和32.66%、107.84%、256.46%,速效磷分别显著增加了32.26%、34.78%、85.37%和34.85%、35.60%、81.71%,速效钾分别显著增加了41.93%、82.49%、155.15%和69.77%、116.58%、206.91%;T3、T4处理土壤全氮分别显著增加了5.68%、25.57%和9.04%、19.77%,T3、T4处理玉米棒干重分别显著增加了11.51%、16.41%;T1、T2、T3、T4处理大豆豆荚干重分别显著增加了11.07%、11.24%、35.14%、24.89%。可见,蔗渣生物炭作为土壤改良剂,在一定程度上改善了石灰土的养分状况,促进了玉米和大豆生长。

Effects of biochar on the properties of limestone soil in karst area and crop growth

A field pot experiment was conducted to study the effects of biochar on the properties of karst limestone soil and crop growth with the plants of maize and soybean planted respectively,five mass percentage levels of biochar from sugarcane bagasse were divided and added into limestone soil,which were no biochar(CK),0.5%(T1),1%(T2),2%(T3)and 5%(T4). The results showed that biochar did not have significant effects on soil pH and available N. However,the soil bulk density was reduced significantly,and the SOC,total N,available P and available K were increased because of the biochar. As compared to the control,the contents of TOC after the treatments of T2,T3 and T4 in maize and soybean group increased by 53.01%,96.77%,237.03% and 32.66%,107.84%,256.46%,respectively,available P significantly increased by 32.26%,34.78%,85.37% and 34.85%,35.60%,81.71%,available K significantly increased by 41.93%,82.49%,155.15% and 69.77%,116.58%,206.91%,respectively. The soil total N after treatments of T3 and T4 in maize and soybean group significantly increased by 5.68%,25.57% and 9.04%,19.77%,respectively. The dry weight of maize cob after treatments of T3 and T4 significantly increased by 11.51%,16.41%,respectively. However,soybean significantly increased 11.07%,11.24%,35.14%,24.89% in T1,T2,T3 and T4 treatments,respectively. Therefore,biochar from bagasse as soil amendment,improved soil properties and nutrients to some extent,accelerate maize and soybean growth.