[KongchangAI]
Unverified85% confidenceSolutionTime unknown

校准土壤pH的标准路径:先购pH4.0与6.86双点校准缓冲液校准电子计→土水比1:2.5浸提静置30分钟→测上清液→根据目标作物(蓝莓4.5-5.5/多数蔬菜6.0-7.0)决定加硫磺粉降酸或石灰升碱→2-4周后复测

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