Editing Sugar beet (section)

== Culture ==
[[File:Zuckerrüben Pflug010.jpg|thumb|A sugar beet farm in Switzerland]]
[[File:Sugarbeetoutput.png|thumb|Worldwide sugar beet production in 2000]]
[[File:Suikerbietenrooier zesrijige bunker (Sugarbeet harvester).jpg|thumb|A beet harvester]]

The sugar beet, like [[sugarcane]], needs a particular [[soil]] and a proper climate for its successful cultivation. The most important requirements are that the soil must contain a large supply of nutrients, be rich in [[humus]], and be able to contain a great deal of moisture. A certain amount of [[alkali]] is not necessarily detrimental, as sugar beets are not especially susceptible to injury by some alkali. The ground should be fairly level and well-drained, especially where [[irrigation]] is practiced.<ref name=gr1/>

Generous crops can be grown in both sandy soil and heavy [[loam]]s, but the ideal soil is a sandy loam, i.e., a mixture of organic matter, clay and sand. A subsoil of gravel, or the presence of [[hardpan]], is not desirable, as cultivation to a depth of from {{convert|12|to|15|in|cm|0}} is necessary to produce the best results.

Climatic conditions, temperature, sunshine, rainfall and winds have an important bearing upon the success of sugar beet agriculture. A temperature ranging from {{convert|15|to|21|°C|°F|0}} during the growing months is most favorable. In the absence of adequate irrigation, {{convert|460|mm|in|0|abbr=in}} of rainfall are necessary to raise an average crop. High winds are harmful, as they generally crust the land and prevent the young beets from coming through the ground. The best results are obtained along the coast of southern California, where warm, sunny days succeeded by cool, foggy nights seem to meet sugar beet's favored growth conditions. Sunshine of long duration but not of great intensity is the most important factor in the successful cultivation of sugar beets. Near the equator, the shorter days and the greater heat of the sun sharply reduce the sugar content in the beet.<ref name=gr1/>

In high elevation regions such as those of Idaho, Colorado and Utah, where the temperature is high during the daytime, but where the nights are cool, the quality of the sugar beet is excellent. In [[Michigan]], the long summer days from the relatively high latitude (the [[Lower Peninsula of Michigan|Lower Peninsula]], where production is concentrated, lies between the 41st and 46th parallels North) and the influence of the Great Lakes result in satisfactory climatic conditions for sugar beet culture. [[Sebewaing, Michigan]], lies in [[the Thumb]] region of Michigan; both the region and state are major sugar beet producers. Sebewaing is home to one of four [[Michigan Sugar Company]] factories. The town sponsors an annual Michigan Sugar Festival.<ref name=voices/>{{unreliable source?|date=September 2015}}

To cultivate beets successfully, the land must be properly prepared. Deep ploughing is the first principle of beet culture. It allows the roots to penetrate the subsoil without much obstruction, thereby preventing the beet from growing out of the ground, besides enabling it to extract considerable nourishment and moisture from the lower soil. If the latter is too hard, the roots will not penetrate it readily and, as a result, the plant will be pushed up and out of the earth during the process of growth. A hard subsoil is impervious to water and prevents proper drainage. It should not be too loose, however, as this allows the water to pass through more freely than is desirable. Ideally, the soil should be deep, fairly fine and easily penetrable by the roots. It should also be capable of retaining moisture and at the same time admit of a free circulation of air and good drainage. Sugar beet crops exhaust the soil rapidly. Crop rotation is recommended and necessary. Normally, beets are grown in the same ground every third year, peas, beans or grain being raised the other two years.<ref name=gr1/>

In most [[temperate]] climates, beets are planted in the spring and harvested in the autumn. At the northern end of its range, growing seasons as short as 100 days can produce commercially viable sugar beet crops. In warmer climates, such as in [[California]]'s [[Imperial Valley (California)|Imperial Valley]], sugar beets are a winter crop, planted in the autumn and harvested in the spring. In recent years, [[Syngenta]] has developed the so-called tropical sugar beet. It allows the plant to grow in tropical and subtropical regions. Beets are planted from a small seed; {{convert|1|kg|lb|abbr=on}} of beet seed comprises 100,000 seeds and will plant over {{convert|1|ha|acre|spell=in}} of ground ({{convert|1|lb|kg|2|spell=in|disp=or}} will plant about {{convert|1|acre|ha|spell=in|disp=or}}.

Until the latter half of the 20th century, sugar beet production was highly labor-intensive, as weed control was managed by densely planting the crop, which then had to be manually thinned two or three times with a [[Hoe (tool)|hoe]] during the growing season. Harvesting also required many workers. Although the roots could be lifted by a [[plough]]-like device that  could be pulled by a horse team, the rest of the preparation was by hand. One laborer grabbed the beets by their leaves, knocked them together to shake free loose soil, and then laid them in a row, root to one side, greens to the other. A second worker equipped with a beet hook (a short-handled tool between a [[billhook]] and a [[sickle]]) followed behind, and would lift the beet and swiftly chop the crown and leaves from the root with a single action. Working this way, he would leave a row of beets that could be forked into the back of a [[cart]].

Today, mechanical sowing, [[herbicide]] application for weed control, and mechanical harvesting have displaced this reliance on manual farm work. A root beater uses a series of blades to chop the leaf and crown (which is high in nonsugar impurities) from the root. The [[Sugar beet harvester|beet harvester]] lifts the root, and removes excess soil from the root in a single pass over the field. A modern harvester is typically able to cover six rows at the same time. The beets are dumped into trucks as the harvester rolls down the field, and then delivered to the factory. The conveyor then removes more soil.

If the beets are to be left for later delivery, they are formed into [[storage clamp|clamps]]. Straw bales are used to shield the beets from the weather. Provided the clamp is well built with the right amount of ventilation, the beets do not significantly deteriorate. Beets that freeze and then defrost, produce complex carbohydrates that cause severe production problems in the factory. In the UK, loads may be hand examined at the factory gate before being accepted.

In the US, the fall harvest begins with the first hard frost, which arrests [[photosynthesis]] and the further growth of the root. Depending on the local climate, it may be carried out over the course of a few weeks or be prolonged throughout the winter months. The harvest and processing of the beet is referred to as "the campaign", reflecting the organization required to deliver the crop at a steady rate to processing factories that run 24 hours a day for the duration of the harvest and processing (for the UK, the campaign lasts about five months). In the Netherlands, this period is known as {{Lang|nl|de bietencampagne}}, a time to be careful when driving on local roads in the area while the beets are being grown, because the naturally high [[clay]] content of the soil tends to cause slippery roads when soil falls from the trailers during transport.