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production. The rich, dark soil is quite productive, and a system of drainage ditches was established early ...
1 st Column) Please circle what type of Installation Method is being used: 1. Ditching Machine, 2. ...
ditches through wind dispersal. Since 2005, we have been investigating the risk potential for exposure ... agricultural streams (or ditches) that have not been exposed to Bt crops, and then introduce Bt and non-Bt corn ...