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United States Department of Agriculture

Agricultural Research Service

Title: Squash production and organic weed control

item Webber, Charles - Chuck
item Shrefler, James

Submitted to: Southern Region of the American Society for Horticultural Science
Publication Type: Abstract Only
Publication Acceptance Date: 1/1/2006
Publication Date: 6/1/2006
Citation: Webber III, C.L., Shrefler, J.W. 2006. Squash production and organic weed control [abstract]. Southern Region of the American Society for Horticultural Science. 41(3):515.

Interpretive Summary:

Technical Abstract: The use of corn gluten meal (CGM) as a preemergence or preplant-incorporated organic herbicide is not recommended for use with direct-seeded vegetable production. Although CGM has been identified as an organic herbicide for weed control in turf and established vegetable plants, direct contact with vegetable seeds can decrease crop seedling development and plant survival by inhibiting root and shoot development. The development of equipment to apply CGM in banded configurations has created an opportunity to investigate whether banded CGM applications will provide significant crop safety for direct-seeded vegetables. The objective of this research was to determine the impact of banded corn gluten meal applications on squash plant survival and yields. This factorial field study was conducted during the summer of 2005 on 32-inch (81-cm) wide raised beds at Lane, OK with two application configurations (banded and solid), two CGM formulations (powdered and granulated), two incorporation treatments (incorporated and non-incorporated), and three application rates [5, 10, and 15 lb/100 ft**2 (250, 500, and 750 g/m**2)]. The two CGM formulations at three application rates were uniformly applied in both banded and solid patterns on August 19. The banded application created a 3-inch (7.6-cm) wide CGM-free planting zone in the middle of the raised bed. The CGM applications were then either incorporated into the top 1 to 2 inches (2.5 to 5.0 cm) of the soil surface with a rolling cultivator or left undisturbed on the soil surface. 'Lemondrop' summer squash (Cucurbita pepo L.) was then direct-seeded into the center of the raised beds. When averaged across the other factors, there was no significant difference between powdered and granulated CGM formulations or incorporating and non-incorporating the CGM for either squash plant survival or yields. CGM application rates did make a significant difference for both crop squash survival and yields when averaged across all other factors. As the CGM application rates increased the plant survival and yields decreased. When averaged across all other factors, the banded application resulted in significantly greater crop safety (90% plant survival) and yields (180 cartons/a) than the broadcast (solid) applications (45% plant survival and 127 cartons/a). The research demonstrated the potential usefulness of CGM in direct-seeded squash production, if used in banded application configuration. Additional research should further investigate the interaction of CGM application rates and the width of the CGM-free zone on crop safety for various vegetables.

Last Modified: 10/19/2017
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