易趣网视觉规范（英文版）

易趣网视觉规范(PPT下载)Currently there are over 200 weed species (see WEEDpak Section J3) known to be present on cotton farms in Australia, many of which are problematic. While a few of these weed species have received in depth research, most weed species remain poorly researched and are difficult to control. In addition, the broad climatic regions over which cotton production occurs in Australia, the differing agronomic practices, as well as the widely varying soil types, often mean that control measure