Carrots grow in different kinds of soils and weather. The only exception is stony or clay soils, or areas that are too warm. Notably, carrots do well in areas where temperatures are between 15 and 18 degrees centigrade. Carrots do extremely well in well-drained fertile soils. For best results, the farmer needs to ensure that the lands are free of large stones and that the farm has enough light. The light encourages shoot growth while fine and well drained soils create the right conditions for carrots roots to grow both in length and breadth.
Soil analysts recommend that carrots should be grown in soils whose pH is between 6.5 and 7.5. Additionally, the soil should have enough potassium, but should not have excess nitrogen. Potassium is an essential mineral in growing carrots since it enhances the sweetness and solid nature of carrots. Too much nitrogen, however, results in branched, fibrous and hairy carrots and should, therefore, be avoided.
Planting carrots is rather straightforward. As the farmer, you need to prepare the land well, by digging and raking out weeds. You also need to ensure you are working with fine soil since the carrot seeds are tiny and may struggle to germinate in lumpy soils. Some farmers prefer to raise the carrot beds and make half-inch deep furrows to contain the seeds. Other farmers prefer to make un-raised carrot beds while making half-inch deep furrows to contain the seeds. Still, other farmers choose to plant carrots through a broadcast approach where the carrot seeds are ‘broadcasted’ on the farm, watered, and left to germinate without the farmer covering them with soil. Of the three approaches, the first and second options are preferable since they allow the farmer to cover his carrot seeds with at least 0.5 centimetre of soil. Additionally, planting in furrows allows the farmer to thin and weed his crop well.
Specifically, make furrows that are two centimetres deep and use 15 centimetre spacing. This spacing leaves enough room for the carrot foliage to grow well as the crop matures. Due to the tiny nature of seeds, it is hard to space them well. However, you can mix the seeds with some light soil to make sowing and spacing a lot easier. When the crop germinates, ensure that you thin the carrots within two weeks of germination. Aim at leaving about 2cm to 4 cm of space between individual carrot seedlings. This spacing will encourage healthy root growth. Before thinning, water the carrots to make the pulling easy. Thinning can be repeated after three weeks if necessary.
Carrots mature in about 110 days (approximately four months). You can check for maturity by brushing aside some soil and inspecting whether the carrot root has attained the desired diameter. Alternatively, you can just pull out a few carrots and decide whether they are mature for the market. The most common carrot varieties in Kenya are Nantes and Super Kuroda. Both varieties have a yield potential of 17 tonnes per acre.
Diseases and pests to look out for when growing carrots include powdery mildew, black rot, Fusarium, aphids and the carrot fly.