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In our region there are some collective farms (grown, growing) wheat. 2. These are the crops (grown, growing) by our farm at present. 3. Small grains are the crops (harvesting, harvested) with combines. 4. This crop will grow well on soil (supplying, supplied) with nitrogen. 5. The environmental conditions (required, requiring) by crops for their best development should be favourable. 6. Crops such as wheat, oats, rye and barley are the ones (required, requiring) relatively cool conditi¬ons for their growth. 7. Humidity is one of the most important factors (influenced, influencing) the crop growth. 8. Plants (producing, produ¬ced) flowers and fruit when days are short are known as short-day plants. 9. The crops (including, included) in the grass family are all cereals and most of forage grasses.