单项选择题
A.0.1%~0.4% B.0.2%~0.3% C.0.3%~0.4% D.0.3%
A.0.1%~0.3% B.0.2%~0.3% C.0.3%~0.4% D.0.3%~0.5%
A.0.1%~0.5% B.0.2%~0.3% C.0.3%~0.5% D.1.0%~5.0%
A.土壤施肥 B.根外追肥 C.叶面喷肥 D.树干注射
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