Compared with CK treatment, the MWD and GMD showed a trend of significant increase while the D and E LT showed a trend of significant decrease ( P < 0.05) under TF, TO, TMF, TMO and TFO treatments after the application of different improved materials, and TM treatment had no significant effect on the indicators of aggregate stability (Table 1 ).
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Effects of the application of different improved materials on reclaimed soil structure and maize yield of Hollow Village in Loess Area.
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From Table 2 , it could be seen that the organic matter content had a highly significant positive correlation with MWD, GMD and > 2 mm water-stable aggregates content and a highly significant negative correlation with E LT , D and water-stable microaggregates content (< 0.25 mm), indicating that soil organic matter was an important factor affecting the formation of water-stable aggregates and their structural stability., and higher organic matter content would promote the formation of macro water-stable aggregates and improve the structural stability of soil.
In the 0–0.15 m layer, after the application of different improved materials in hollow village reclaimed soil, the proportion of water-stable macroaggregates (particle size > 0.25 mm) showed an overall increasing trend, and the water-stable microaggregates content (particle size < 0.25 mm) showed a decreasing trend.
The results showed that: soil organic matter (SOM) and total nitrogen contents increased significantly after the application of different improved materials, which promoted the cementation and aggregation of water-stable microaggregates (< 0.25 mm), and the water-stable macroaggregates showed an increasing trend.