Gel-Embedded Biochar and Hydroxyapatite Composite for the Improvement of Saline-Alkali Soil and Plant Growth Promotion.

In the CB-SA-HAP treatment group, the content of soil AHN, AP, and AK showed a trend of first decreasing and then increasing with the increase in the proportion of HAP added.

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In the SB-SA-HAP treatments, pH showed a decreasing trend with increasing HAP addition rate, with SB2.0 (pH = 6.70) having the lowest pH ( Figure 3 B).

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