| Based on the principle of equal nitrogen content,the proportions of different biogas liquid fertilizers were set up,and the dry sieving method and wet sieving method were used to explore the co-application of biogas liquid fertilizers.The soil aggregates of different arable layers of Shajiang black soil in the wheat season and corn season were explored.Composition and stability parameters,as well as the short-term effects of soil bulk density,natural water content,and field water holding capacity.The results of the study showed that compared with the blank control,with the increase of the application ratio of biogas slurry,the soil bulk density of each arable layer of Shajiang black soil in the wheat and corn seasons will show a downward trend,but the natural water content and field water holding capacity will increase significantly,In this experiment,the effect is getting better with the increase of the amount of biogas slurry.The ratio of force-stable aggregates and water-stable aggregates with particle sizes of 2-5mm and2-0.25 mm in each arable layer of Shajiang black soil in wheat season and corn season increased,especially in wheat season 75% biogas slurry combined with 25% compound fertilizer treatment,It has a significant effect on the strength and water stability of the two grades of aggregates(P<0.05),and the increase ratio is 5%-35%.As the proportion of biogas slurry increases,the average weight diameter(MWD)and geometric mean diameter of the 0-10 cm soil stability and water stability aggregates of the corn season Shajiang black soil and the 10-20 cm soil water stable aggregates(MWD)and geometric average diameter(GMD)shows a decreasing trend,but it will increase the MWD and GMD of the 10-20 cm soil mechanically stable aggregates,while the MWD and GMD values of each plough layer in the wheat season will increase and then decrease.At the same time,with the increase of the amount of biogas slurry,the PAD value of the 0-10 cm soil aggregates in the corn season Shajiang black soil increased significantly,while the PAD value of the10-20 cm soil aggregates in the corn season and the 0-10 cm plow layer in the wheat season decreased.The AIS of wheat season and corn season will first increase and then decrease with the increase of biogas slurry.Among them,the combined application of 75% biogas slurry and 25% chemical fertilizer in wheat season and the combined application of 50% biogas slurry and 50% chemical fertilizer in corn season The AIS is lower.The fractal dimension of each plough layer in the wheat season will increase with the increase of the ratio of biogas slurry application,while the fractal dimension of the corn season will show a decreasing trend in each plough layer with the increase of the ratio of biogas slurry.Among them,50% of the biogas slurry is The 50% fertilizer combined application has the best reduction effect,with a reduction rate of5.34%.In summary,the combined application of biogas slurry and chemical fertilizers has a significant impact on the improvement of soil aggregates in Shajiang black soil.At present,in this experiment,the combined application of 75% biogas slurry and 25% fertilizer in the wheat season and 50% biogas slurry and 50% in the corn season The combined application of chemical fertilizers has the best improvement effect,so it can be popularized and applied in the transformation of low-yield fields in the distribution area of Shajiang black soil. |
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