Mechanising on-the-run grain sampling

Abstract

Capturing grain samples at harvest for later grain protein analysis creates logistical complications when spatial position and yield are to be monitored coincidently. The objective of the present study was to develop a sampling device that automatically captures grain during machine harvesting. The device consisted of an on-board GPS, a palm-top computer, a John Deere GreenStarTM moisture meter, and an interface box linking the components. The device has been tested on John Deere and Case harvesters. Grain samples of wheat, barley and sorghum crops were taken as frequently as every 25 m of travel. After protein analysis, the resultant protein map has been able to improve the interpretation of coincident yield maps for grain growers in eastern Australia. Additional qualitative information that influence grain price or which highlight yield-limiting factors, such as kernel weight, moisture, density or colour, may be also obtained from samples captured by the device.