Chaenomeles is a cucurbitaceae vegetable crop, which likes warm and light. It is widely planted in Yunnan, Zhejiang, Fujian and other southern provinces in China, and local people generally eat juicy and crisp melons, which are named after their shape like "bergamot". Fingered citron is delicious, crisp and sweet. It tastes like kohlrabi in the north and is rich in vitamins and mineral nutrients. In the past, it was rarely seen in the northern region. In recent years, it was first introduced successfully in Shandong, and the planting area has expanded year by year, so the supply in the northern market is also increasing, which is gradually favored by consumers. Chaenomeles is more resistant to storage and transportation, and its market supply period is longer. It can be seen in the market from harvest after autumn to April next year. It has a positive effect on enriching the vegetable market and regulating the supply of vegetables in light and peak seasons. Chaenomeles cultivation is simple and flexible. It can be planted in the courtyard and by the wall, and can also be produced in a large area, with good production benefits.

Fingered citron is a climbing plant, with large spreading degree and strong growth potential. In cultivation, attention should be paid to promoting the growth of vines and leaves in the early stage, so as to lay the foundation for a large number of melons in the later stage. Generally, only 6 ~ 7 plants can be planted in the open field per mu, and each plant bears 200 ~ 500 melons, and the harvest is about 200 kilograms. The weight of a single melon is 300-350g, and the maximum is 600-700g. Chaenomeles is suitable for the development of garden planting, and a large frame is built for its growth. At present, some areas also make extensive use of greenhouses and large scaffolding for large-scale planting. Because there are few plants per mu, there are few pests and diseases during the growth and development of Chaenomeles, so the cultivation and management of Chaenomeles is relatively simple and convenient compared with other vegetables. Besides proper management, rational fertilization is a key technical measure to obtain high yield.

The root system of bergamot is well developed, but the distribution of root system is shallow, and its lateral direction can reach1~ 2 meters in the soil layer. Fertilization should be in shallow soil layer, and the utilization rate is low if fertilizer is applied too deeply. There are few plants per mu of fingered citron, and the yield per mu is based on the yield per plant. Fertilization is also the application of fertilizer to a single plant. We should pay attention to the reasonable ratio of nitrogen, phosphorus and potassium to improve the yield and quality of fingered citron. The growth period of bergamot is relatively long, and nutrient supply should be ensured during the growth period; The absorption of fertilizer is the largest at flowering and fruit-setting stage, so topdressing should be done in time to meet the nutrient demand of its growth and fruit-setting. Compared with other melon vegetables, the total amount of fertilizer absorbed by bergamot is relatively less.

(1) Fertilize at seedling stage.

Generally, fingered citron is transplanted by seedling, which requires little nutrients at seedling stage, and can be absorbed from the nutrient soil for its own growth. The preparation of nutrient soil can refer to other vegetable seedling nutrient soil preparation methods. However, it should be noted that fingered citron is very sensitive to human excrement and urine at seedling stage. It is easy to die when applied at seedling stage. Special attention should be paid in production.

(2) Planting base fertilizer.

Because the root system of Chaenomeles is shallow, fertilization should be concentrated in 20 cm soil layer on the surface. Amount of base fertilizer: 30kg of fully decomposed organic fertilizer is applied to each plant to increase the organic matter content in the root distribution layer and promote the root growth and development of Chaenomeles, and about 5 kg of ammonium sulfate 1 kg, compound fertilizer 1 kg or human excrement and urine and 5 kg of plant ash are applied to each plant. Special attention should be paid to the fertilization method: mix and spread the above fertilizers on the 2 square meters of circumferential land centered on the planting hole, turn them into the soil layer about 20 cm deep and stir them evenly.

(3) Topdressing should be done sooner rather than later.

The first topdressing is also called seedling-promoting fertilizer. Generally, after planting, topdressing seedling-promoting fertilizer begins about 1 month. Early dressing and seedling-promoting fertilizer can promote the vigorous growth of melon seedlings, bloom early and bear melons early, with long fruiting period and high yield. Therefore, the first topdressing time should be sooner rather than later. Apply compound fertilizer 1 kg or 5 kg of decomposed human excrement and urine and 0.5 kg of calcium superphosphate to each plant. Open an annular ditch 30 ~ 40 cm away from the melon seedlings and apply it in the shallow soil layer.

The second topdressing should be carried out after the last topdressing 1 month, and it is required to open an annular ditch 60 ~ 70 cm away from the melon seedlings, with 2 ~ 3 kg of compound fertilizer or organic fertilizer 1 0 ~15 kg, calcium superphosphate1kg and 2.5 kg in plant ash. Be sure to stay away from melon seedlings as required, so as to avoid too close furrowing and fertilization, which will cause a large number of root systems of bergamot to be damaged in shallow soil layer and affect its normal growth.

The third topdressing is about 20 days away from the second one, and it should be further away from the seedlings. Ditching or spreading 90 cm away. The application amount depends on the growth of melon seedlings. If the growth potential is good, the application amount is the same as the second time. If the growth potential of melon seedlings is poor, it can be measured as appropriate.

In short, the proportion of nitrogen, phosphorus and potassium should be paid attention to in the fertilization of bergamot, and the application of chemical fertilizer should also be combined with organic fertilizer, and it should be watered immediately after fertilization to promote the absorption of fertilizer by plants.