21. Some crop farming also took place, most notably during the warm periods of the 13th century. 22. Therefore, farmers continue deforesting new areas when soil nutrients become too scarce to support crop farming . 23. Nevertheless, successive governments of the 1870s and 1880s surveyed and released former pastoral land for crop farming . 24. For this reason dry grain crop farming , mainly of wheat and barley, is more prevalent than viticulture. 25. Opportunities exist in agriculture, particularly dairy and crop farming thanks to fertile soils and a good weather pattern. 26. Until the mid-1980s, Morayfield remained a rural area consisting of a small dairy holding and small crop farming enterprises. 27. It was originally an area of farmland, but the soil was so poor that arable crop farming was nearly impossible. 28. Crop farming , sheep farming, and the working of stone from the quarries formed the early backbone of San Marino's economy.29. Alltech develops agricultural products for use in both livestock and crop farming , as well as products for the food industry. 30. These trees are ideal for cash crop farming because of the essential oils that can be extracted from the leaves.
