Using state-of-the-art technology, a well-maintained combine harvester operated effectively in a mature crop, can attain clean grain recoveries of 99 % – a remarkable achievement! Work rates in excess of one hectare (10 000 m 2 ) per hour are readily achievable with two operators, one to drive the combine, the other to drive a tractor-trailer or a truck into which the combine periodically empties its grain for transportation to the farm granary or direct to the local grain merchant or storage facility.
For example, in an extensively farmed area of Africa where hoe cultivation is used yields may be low, while in an intensively farmed tractorized region of India yields may be much higher. The yield differences may be caused in part by differences in other inputs, such as fertilizers or seeds. They could also be caused by better tillage in India-but this does not mean that good tillage is achieved only by tractors and cannot be achieved by hand. Examples from Java show that cultivation by hand can be as thorough as by ox or tractor.

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Using state-of-the-art technology, a well-maintained combine harvester operated effectively in a mature crop, can attain clean grain recoveries of 99 % – a remarkable achievement! Work rates in excess of one hectare (10 000 m 2 ) per hour are readily achievable with two operators, one to drive the combine, the other to drive a tractor-trailer or a truck into which the combine periodically empties its grain for transportation to the farm granary or direct to the local grain merchant or storage facility.
For example, in an extensively farmed area of Africa where hoe cultivation is used yields may be low, while in an intensively farmed tractorized region of India yields may be much higher. The yield differences may be caused in part by differences in other inputs, such as fertilizers or seeds. They could also be caused by better tillage in India-but this does not mean that good tillage is achieved only by tractors and cannot be achieved by hand. Examples from Java show that cultivation by hand can be as thorough as by ox or tractor.

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