imperfectly drained meaning in English

排脓不良
排水不良的
排液不畅

Denitrification , on the other hand , can be very serious with a combination of no tillage and imperfectly drained soils
硝态氮的淋失虽然在免耕制下稍高一些，但在夏季作物上，一般不是氮损失的主要途径。
Nevertheless , use of soil incorporation for urea and anhydrous ammonia to reduce volatilization , the practice of delaying nitrogen fertilizer application in imperfectly drained soils to minimize denitrification and leaching , and patience in the case of immobilization will tend to resolve all these problems
但是，采用把尿素和液氨和土壤掺混施用以减少氨挥发，在排水不良的土壤上采取延迟施氮期的办法以减少反硝化及淋失，以及对于氮固定问题采取耐心克制的态度，这些问题就都能得到解决。