1. Fertilization on the whole land: Select the sandy loam field with deep soil layer, convenient drainage and irrigation, rich in organic matter and loose and breathable. Till and turn winter hoe, the depth of ploughing is more than 25 cm, 2,500 kg of fermented manure per mu, 20 kg of superphosphate, 25 kg of potassium chloride or 100 kg of high-quality compound fertilizer.

Second, the ditch system: carrots avoid water, must build a high standard ditch system to ensure smooth irrigation and drainage. After applying the base fertilizer, press the width of 120 cm for the ridge, and leave a ridge ditch of about 20 cm between each shovel. Dig a hole of 33 cm deep for each two hoes, and dig a waist of 67 cm deep every 30 meters. Ditch, the head of the field digging a drain of 100 cm deep, reaching the filling, the row is drawn, and the bottom is lowered.

Third, the appropriate sowing: seeding with seeding agent plus new high-fat membrane seed dressing before sowing, can avoid underground pests, isolate virus infection, improve seed germination rate. In spring, it can be divided into two sowing dates: from late January to early February, it should be cultivated with plastic film and small arch shed; sowing from late February to early March, it should be covered with plastic film. According to the line spacing of 20 cm, the ditch is sown, each line is 5 lines, the ditch depth is 2-3 cm, and the seed amount is 300 g per acre, and the soil is covered after sowing.

Fourth, small shed management: take the mulch and the arch shed cultivation. When the emergence rate of carrots is more than 50%, the seedlings are taken out, and then the mulch is compacted along the roots of the seedlings with fine soil, and then the shed film is covered. In mid-March, the temperature in the shed should not exceed 30~C. When the temperature is high, the gap should be ventilated in the leeward side. After the night frost in early April, the shed was removed.

V. Growth management: Suitable time seedlings, according to the condition of radish growth, ensure the reasonable supply of fertilizer and water, and spray new high-fat film to protect the fat. During the seedling stage, the agricultural news sprayed the fruit to strengthen the nutrient-matching function, and provided nutrient delivery, which promoted the rapid and balanced expansion of the radish. Temporary cultivating and weeding, often keeping the soil loose. In order to prevent the appearance of green heads, the mulch should be removed when the carrots are strapless, and the roots should be smashed with fine soil so that the shoulders are not exposed.

Pest control: The pests and diseases that endanger carrots include root-knot nematodes, aphids and black rots, black spot disease, etc. In the early stage of the disease, according to the requirements of plant protection, spray targeted drugs plus new high-fat film for prevention and treatment.

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Roundness Measuring Instruments

Roundness meter is a length measuring tool for measuring roundness using the rotary axis method. The roundness meter is a measuring tool for measuring the roundness error of the workpiece using the rotary axis method. Roundness tester is divided into two types: sensor rotary type and workbench rotary type. During measurement, the measured part is installed concentrically with the precision shaft system, and the precision shaft is attached with an inductive length sensor or a workbench for precise circular motion. It is composed of sensor, amplifier, filter and output device of the instrument. If the instrument is equipped with a computer, the computer is also included in the system.Roundness Tester

The principle of the roundness meter is the same as that of the coordinate measuring machine. In fact, its working principle is very simple. The coordinate measuring machine is a point acquisition tool. Its principle is to collect points first, and then form a line from points, and then form a three-dimensional model from lines. CMM is a kind of measuring equipment that has a guiding mechanism, a length measuring element, a digital display device in three mutually perpendicular directions, and a worktable that can place the workpiece (not necessarily large or huge). The measuring head can be moved to the measured point easily by manual or motorized means, and the coordinate value of the measured point is displayed by the reading device and the digital display device. Obviously, this is the simplest and most primitive measuring machine. With this measuring machine, the coordinate value of any point in the measured volume can be displayed through the reading device and digital display device.

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