Fig. 1. Experimental abrasive grit applicator used in 2013 and 2014. Grits were siphonfed
from a bucket and propelled via compressed air provided by a compressor hauled
in a cart behind a walk-behind tractor.
Table 1
Average application rate of each abrasive grit in one field pass traveling approximately
1.6 km h1.
Grit Application rate
akg ha1 kg 100 m row1
Walnut shells 291 5.3
Maize cob 206 3.8
Greensand 226 4.1
Soybean meal 198 3.6
a Assuming 1.83 m crop row spacing