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Isolating Corn Plant Spacing Variability

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  2015 ASABE Annual International Meeting  152115668.(doi:10.13031/aim.20152115668)
Authors:   Arzu Yazgi, Randal K Taylor, Hossein - Navid, Rick Kochenower
Keywords:   Precision seeding, seed metering, acceleration, vibration

Abstract. A 3-point mounted 4-row John Deere 7300 planter was used to plant corn at two locations in Oklahoma with two soil conditions, no-till and strip till, at each location. Each soil condition was treated as an individual experiment and treatments were not compared across these or locations. The experiment was a split-plot design with down force setting (three levels in no-till and four levels in strip till) replicated three times and four randomized ground speeds (4.8, 8.0, 11.2, and 14.4 kph) for each down force pass. The planter was instrumented to measure down force, vertical acceleration, and seed spacing in the seed tube on the two center rows, ground speed, and vertical acceleration of the toolbar. After emergence was complete, 25 plant spacings were measured in each of the two center rows within each plot to determine mean plant spacing, multiples, misses, and spacing variability. The standard deviation in seed spacing in the tube was correlated with the plant spacing standard deviation for three of the five conditions. Ground speed was correlated with seed spacing standard deviation in the seed tube and plant spacing precision for all five seeding conditions. The relationship between down force and spacing measurements, whether in the seed tube or plants after emergence, was inconsistent.

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