Choosing the appropriate crops to carry on intercropping may enhance the efficiency of crops using the nitrogen phosphorus.
选择合适作物种类进行间作，可提高作物对氮磷的利用效率。
The effects of submerged plants on the purification efficiency of nutrient contaminations and phosphorus concentration in sediment were studied by using constructed pony enclosures.
通过在污水中加入示踪剂 ，研究了人工湿地的水力学特点及其对污水净化效果的影响规律 。
The effects of submerged plants on the purification efficiency of nutrient contaminations and phosphorus concentration in sediment were studied by using constructed pony enclosures.
通过在污水中加入示踪剂 ，研究了人工湿地的水力学特点及其对污水净化效果的影响规律 。
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