Effect of Alkaline Soil on Carrot Growth Research Report

(1) Temperature Carrots are semi-cold-tolerant vegetables, and the temperature requirements for the vegetative growth period and the reproductive growth period are different. Seeds germinate at 4 6 and begin to grow at 8 o'clock; Seedlings can emerge in about 18 20 after 10 days. Seedlings can tolerate low temperatures of -3 -4 for a short period of time, and can also grow normally under high temperature conditions above 27.

The optimal temperature for carrot germination is 20 25, and the suitable temperature for leaf growth is 20 25 during the day and 15 18 at night. In the swelling stage of fleshy roots, 20 22 is suitable, and the growth stops below 3. Carrot roots can be planted when the soil temperature reaches 8 10. The suitable temperature for carrot flowering, pollination and seed setting is 22 28 during the day and 15 20 at night.

If the daytime temperature exceeds 35, pollination and seed setting are not allowed.

2) Light Carrots are light-loving, long-day plants, especially in the vegetative growth period, which require more than moderate light intensity.

Carrots prefer to grow in deep, fertile, loose, well-drained, and highly porosity sandy loam soils, and keep the soil moist when sowing to promote seed germination and neat emergence. At the seedling stage and the peak stage of leaf growth, see dry and wet, ensure the normal growth of the aboveground, and increase the soil permeability to promote the good development of straight roots. The succulent root expansion period is the time when the water demand is the most, so even watering is done to meet the nutrients of the fleshy root swelling, and the amount of irrigation should also be prevented, so as not to cause root cracking.

Carrots like fertile and loose soil, and the growth cycle of carrots should be controlled at all stages, and scientific fertilization, watering, and insecticide should be controlled.

Base fertilizer The root system of carrots is deep in the soil, which is suitable for fertile and loose sandy loam soils. Before sowing, deep ploughing should be carried out, and sufficient basal fertilizer should be applied. 2000 2500kg of manure and human manure per 667 square meters, 15 20kg of superphosphate, and 100 150kg of plant ash were applied.

If only chemical fertilizers are used, 20kg of ammonium sulfate, 30 to 40kg of superphosphate, and 30 to 35kg of potassium sulfate can be used per 667 square meters. There are two kinds of application methods: sprinkling and furrowing, both of which should be mixed with soil. Fertilization had a great effect on the shape of fleshy roots, and the proportion of deformed roots increased significantly when the amount of chemical fertilizer was more and the proportion of organic fertilizer was less. The addition of rotting organic fertilizer as basal fertilizer can reduce the formation of deformed fleshy roots.

If unrotted organic fertilizer is applied, it is easy to increase deformed roots.

Loose and fertile sandy soil, which is conducive to downward growth and is rich in nutrients.

Sunlight is also very important, and it will grow so sweet when it shines well!

The sandy land with a lot of water is rich in nutrients and sweet and green.

Carrots have similar soil requirements to radishes, preferring sandy loam and loam soils with deep soil layer, loose soil, good drainage and high porosity. If the carrot is cultivated in the clayey soil with poor aeration, the fleshy roots will have light color, many fibrous roots, easy to grow tumors, and poor quality; If cultivated in a low-lying and poorly drained place, its fleshy roots are prone to rupture, which is easy to cause rot and increase the number of forked roots. The soil requirements for the reproductive growth period of carrots are basically the same as those during the vegetative growth period, and the loose soil is conducive to increasing the ground temperature and promoting rooting.

Carrots have a wide range of adaptation to soil pH, and can grow well in soil with pH 5 8, but poor growth in soil with pH below 5.

Carrots absorb the most potassium during the whole growth and development process, followed by nitrogen and calcium, phosphorus and magnesium less, and the absorption ratio of nitrogen, phosphorus, potassium, calcium and magnesium is 100:40 50:150 250:

50～70：7～10。Nitrogen is the basic substance that makes up plant bodies and products, but it should not be too much, otherwise it will make the leaves long, the fleshy roots are small, and the yield will be reduced.

Potassium can promote the meristem activity of root cambium, and the yield increase effect is very significant. According to the test, for every 1000kg of carrot products produced, about nitrogen, phosphorus and potassium are absorbed.

Carrot growth needs more fertilizer, fertilization should be based on base fertilizer, supplemented by top dressing. The base fertilizer should use well-rotted organic fertilizer to avoid damaging the seedling root system and producing forked roots. Carrot fertilization should master the combination of nitrogen, phosphorus and potassium, and the proportion should be balanced.

Carrots have different fertilizer requirements at different times. In the vigorous growth period of carrot leaves, there is a lot of demand for nitrogen fertilizer, and when topdressing, nitrogen fertilizer should be mastered, but too much nitrogen fertilizer should be prevented, so as not to cause aboveground growth. In the hypertrophic stage of fleshy roots, the demand for potassium fertilizer is the mainstay, and compound fertilizer with high potassium content should be applied.

During the reproductive growth period, phosphorus and potassium fertilizers are mainly applied to prevent the use of excessive nitrogen fertilizers, resulting in overgrowth and delaying the flowering period. Foliar application of molybdenum fertilizer during flowering is beneficial for seed setting.

Environmental conditions and requirements for carrot growth.

Carrot is a common vegetable, with high nutritional value, generally grown in Shandong, Henan, Zhejiang, Yunnan and other places, carrots like sunlight, generally more suitable for growing in a warm and humid environment.

Carrot growing temperature.

Carrots prefer a warm environment, generally when just planting, as long as the temperature of the environment reaches about 20-25 degrees, only 5 days can germinate, and carrots will grow rapidly in the environment of 13-18 degrees.

Carrot growth humidity.

The taproot of the carrot grows very well, and there are many lateral roots, which have a certain drought tolerance, and generally give sufficient water for the normal growth of the plant, and the soil is kept moist, and the carrots that grow will be very watery.

Carrots grow on soil.

Carrots are generally more suitable for planting in deep, fertile, well-drained and humus-rich sandy soil.

Carrot growth cycle and process.

The growth cycle of carrots is 2 years, the edible part of carrots is the roots, generally around May every year is the best time to plant carrots, the growth period of carrot roots is only two months enough for ants, and then the plants will bloom and bear fruit.