The European bindweed (Convohrulus arucnsis L.) has an extensive root system. A large number of feeding roots are located in the upper two feet but the main tap root often extends to a depth of twenty feet. Soil samples taken at one and two foot depths in 1933, 1934 and 1935, at Hawarden, Iowa, from corn ground, heavily infested with bindweed, and free from bindweed, showed very little difference in soil moisture content. As the soil moisture content was often below the wilting coefficient, it was found that the bindweed developed readily while the corn grew very little. European bindweed is able to complete successfully with corn because of its deeply penetrating root system.
Proceedings of the Iowa Academy of Science
©1938 Iowa Academy of Science, Inc.
Bakke, A. L.
"Soil Moisture Relationship of the European Bindweed (Convolvulus Arvensis L.),"
Proceedings of the Iowa Academy of Science, 45(1), 100-100.
Available at: https://scholarworks.uni.edu/pias/vol45/iss1/17