Table 1.

Trial treatment and specific measures.

Treatment	Code	Application method and dosage
Control	CK	Do not apply soil amendment, and fertilize according to local standards
Lime	LM	Lime was applied at an amount of 1.5 t ha−1, equivalent to 3.15 kg of per plot. Other indicators are the same as CK
Silicon–calcium fertilizer	SC	The silicon–calcium fertilizer was applied at an amount of 2.25 t ha−1, equivalent to 4.73 kg of per plot. Other indicators are the same as CK
Biochar	BC	Biochar was applied at an amount of 10 t ha−1, equivalent to 21 kg of per plot. Other indicators are the same as CK