| Popis: |
Vacuum seed metering systems are one of the most common methods for singulating corn seed. Much of the attention related to improving down-the-row seed spacing has been directed at improving metering systems. A 4-row John Deere 7300 row crop planter was used to test three planter metering systems (standard corn, ProMAX 40, and Precision Planting’s eSet). Tests were conducted at three locations in Oklahoma representing three different growing environments and thus seeding rates in 2011 and one location with two environments in 2012. Four travel speeds (4.8, 8, 11.3, and 14.5 km h-1) were randomized with each seed meter plot. After emergence, plant spacing was measured in 6.1 m within the center two rows of each plot. There was no distinct advantage for planting below 8.0 km h-1 for any meter. For planting at the two highest travel speeds, meter selection will have an impact on overall plant spacing, as indicated in the mean and standard deviation of plant spacing. |
