| 21. | Keogh said he has no immediate plans to patent fire or crop rotation.
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| 22. | The island is divided into six sectors or suyus for crop rotation purposes.
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| 23. | Crop rotation and fertility by alternating deep-rooted and shallow-rooted plants.
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| 24. | They practised biennial crop rotation, alternating from year to year between fallow and cultivated.
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| 25. | Jones probably would continue his experiment in crop rotation regardless of what Congress does.
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| 26. | There is evidence that New Guinea gardeners invented crop rotation well before western Europeans.
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| 27. | He also studied effect of crop rotation on soil quality.
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| 28. | Many challenges exist within the practices associated with crop rotation.
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| 29. | Even with mobile crop rotation, southern villages were necessarily less mobile than northern ones.
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| 30. | The third principle is the practice of crop rotation with more than two species.
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