生物炭类型和施用量对陕北黄绵土土壤理化性状和谷子生长的影响OACSTPCD

[Objective]To investigate the effects of different biochar types and application amounts on loess soil physicochemical properties and millet growth in northern Shaanxi.[Methods]Three biochar types of corn straw(JG),rice husk(DK)and bamboo stalk(ZG)were selected.Three carbon application levels,C1(300 g/m2),C2(600 g/m2)and C3(1 200 g/m2)were set up,and no biochar application was set as control(CK).Using indoor simulation millet cultivation experiments,by measuring soil physicochemical properties and millet growth indexes,the effects of different biochar types and application amounts on loess soil physicochemical properties and millet growth in northern Shaanxi were studied.[Results]DK biochar had significant regulation effects on soil water content and bulk density.Compared with JGC2 and ZGC2 treatments,soil water content of DKC2 treatment decreased significantly(P<0.05)by 15.78%and 18.26%,respectively.Compared with JGC3 and ZGC3 treatments,the soil bulk density of DKC3 treatment decreased significantly(P<0.05)by 20.07%and 24.63%,respectively.When applying ZG biochar,the contents of soil organic carbon and available potassium gradually increased with the increase of biochar application amount.Under ZGC3 treatment,the contents of soil organic carbon and available potassium significantly(P<0.05)increased by 134.35%and 77.94%,respectively,compared with CK.When JG biochar was applied,the millet plant height and aboveground dry weight increased first and then decreased with the increase of biochar application amount.The millet plant height and aboveground dry weight of JGC2 treatment significantly increased(P<0.05)by 32.62%,77.13%,respectively,compared with CK.Grain weight per panicle,total dry weight and plot yield significantly increased(P<0.05)by 126.18%,65.36%,57.54%and 79.25%,82.46%,50.37%,respectively compared with DKC2 and ZGC2 treatments.The underground dry weight,root surface area and root shoot ratio of millet treated with DK biochar increased first and then decreased with the increase of biochar amount.Compared with CK,the underground dry weight,root surface area and root shoot ratio of millet under DKC2 treatment significantly increased(P<0.05)by 104.53%,90.30%and 82.11%,respectively.The grain harvest index of ZGC3 treatment significantly increased(P<0.05)by 50.00%compared with DKC3 treatment.[Conclusion]Different biochar types and application amounts had different effects on millet growth.600 g/m2 corn straw biochar treatment was more conducive to the improvement of millet dry weight,600 g/m2 rice husk biochar treatment was more conducive to the growth of millet root system,and 1 200 g/m2 bamboo stalk biochar treatment was more conducive to the improvement of millet harvest index.Planting millet in loess soil of northern Shaanxi,applying corn stalk and bamboo stalk biochar had better ability of regulating soil water and fertilizer and increasing yield and efficiency.