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Row Spacing
Varieties with a Type I or Type II plant habit are commonly grown in rows spaced from 6 to 30 inches. Studies conducted at several North Dakota locations indicate a yield advantage for both dryland and irrigation for narrow planted rows in both Type I and Type II bean cultivars.
There are several potential problems with growing dry beans in narrow rows. Weed control may be a problem since currently available preplant, pre-emergence and postemergence weed control chemical treatments may not provide complete weed control. This can be important since narrow rows cannot be cultivated to control weeds as easily as more widely spaced rows. The problem may be nullified to a certain extent with late emerging weeds, since dry beans grown in narrow rows, especially at higher populations, will shade and crowd small weed seedlings. Future development of broad spectrum postemergence herbicides would solve many of the potential weed problems of dry bean production in narrowly spaced rows. An alternative to all narrowly spaced rows would be a combination of 10-inch and 30-inch spaced rows arranged in a pattern to allow tractor movement through the fields for cultivation.
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