Mulching black film can prolong the growing periods and raise the rhizomes yield underground of Codonposis Lanceolata Bentn et Hook.f and Platycodon grandiflorum(Jacq) A.

  • 覆盖黑色地膜可延长轮叶党参和桔梗的生育期,提高地下部根的产量;
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