In the early 19th century, animals were the chief source of power in farming. Later in the century, steam power gained in importance. During World War I gasoline- (petrol-) powered tractors became common, and diesel engines later became prevalent. In the developed countries, the number of farm workers has steadily declined in the 20th century, while farm production has increased because of the use of machinery.
Likewise, transplantation in areas inaccessible to tractors (rice paddy fields or steep mountain slopes) is possible using aerial power where large areas need to be planted in order to justify the increased cost.

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In the early 19th century, animals were the chief source of power in farming. Later in the century, steam power gained in importance. During World War I gasoline- (petrol-) powered tractors became common, and diesel engines later became prevalent. In the developed countries, the number of farm workers has steadily declined in the 20th century, while farm production has increased because of the use of machinery.
Likewise, transplantation in areas inaccessible to tractors (rice paddy fields or steep mountain slopes) is possible using aerial power where large areas need to be planted in order to justify the increased cost.

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