A column winnower for small-sample seed cleaning

Abstract

The construction and operation of a column winnower capable of cleaning a seed sample in 10-20 s is described. Samples are processed rapidly because the machine is self- cleaning and the fan operates continuously. The latter is achieved by using a by-pass valve for the air flow. The winnower was able to clean seed samples from many species including sunflower, grain sorghum, pigeonpea and wheat. It would have particular application in plant-breeding programs which need to handle many seed samples rapidly and efficiently each generation. The advantages of this winnower are speed, convenience and versatility.