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There is a cycle, of life you can call it, which goes between the soil and the rain clouds. When allowed to pass rain will move in over a piece of land, drop the water on the soil, which in turn the soil makes good use of and you have more vegetation. More vegetation that processes more carbon and releases water gradually that raises up and forms clouds. Plants are good at holding a narrow temperature range, whereas the empty land will have hot days and cold nights.
However, arid land is hotter than land with vegetation. The sun will bake it and the hot air will rise and are likely to push the rain clouds away. By leaving the land empty with a single crop per year (mono crop) you will have months of empty dry land. This is how you stress the soil and end up with a desert.