OpenAGRICOLA
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- AgSpace[remove]2
- basins[remove]2
- land use[remove]2
- watersheds2
- arid lands1
- biogeochemical cycles1
- drainage1
- dry environmental conditions1
- ecology1
- ecosystems1
- global change1
- interdisciplinary research1
- land management1
- land use change1
- nitrate nitrogen1
- nonpoint source pollution1
- research programs1
- riparian areas1
- seasonal variation1
- semiarid zones1