The investigation performed so as to find out the effect of the covering of plastic film on the growth of sugarcane root system and the ecological environment.
通过旱地冬植和宿根甘蔗的地膜覆盖试验，研究地膜覆盖对土壤生态环境及蔗苗根系生长的影响。
Plastic housings (PP reinforced) with ecological round elements increasingly replace housings of sheet steel and filter elements with sheet steel end disks.
采用环保型圆型滤芯得塑料外壳（PP增强） 已在逐渐取代钢板外壳和钢板端盖的滤芯。
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