How many leaves are there when cucumber is transplanted? What is the basis?

Cucumber is a common vegetable in our daily life. Whether eaten raw or fried, cucumbers are delicious, so we have a lot of knowledge about cucumber cultivation.

To know whether cucumbers are warm or not, when is the best time to plant cucumbers? Taking spring cucumber as an example, the sowing date is determined according to the planting period of cucumber. Four leaves and one heart at physiological seedling stage of cucumber. Calculate the sowing date according to the seedling age on the calendar, that is, 40-50 days in advance. Sow seeds. Autumn cucumber, it is recommended to sow about 70 days before the first frost. If it is used for seedling transplanting, the time can be advanced by 7- 10 days. However, due to the high temperature and rainy season in seedling stage and early growth stage, autumn cucumber is prone to diseases and insect pests, so the yield of autumn cucumber is generally low. The length of seedling raising period is also closely related to seedling raising methods. In order to raise seedlings quickly, greenhouse seedling raising is often used to shorten the seedling raising time, and the grown seedlings are also very strong, which can also improve the yield of cucumber, so it is better to raise seedlings as soon as possible if conditions permit.

Take the spring melon as an example, after the local late frost, the temperature is more than 0/8 degrees every ten days. Such as Beijing, Shijiazhuang, Tianjin and other places are planted after the end of April. In a word, the requirement of temperature index is very important. First of all, the temperature at night should not be higher than 5 degrees, and the soil temperature around 10 cm should not exceed 12 degrees. If it is autumn cucumber, it is best to plant it directly. In addition, when planting seedlings, you must choose sunny days without wind. Planting density is not unique, but also depends on the variety. It is best to choose varieties with strong disease resistance, good commodity and high yield, which are especially suitable for open cultivation in spring. Many times when you buy seeds, the merchants will recommend them to you according to your requirements. It is best to use organic fertilizer for fertilization. It is better to have farmyard manure in many rural areas. Ploughing before planting is beneficial to rainwater drainage and prevention of waterlogging. The seedling stage is about 35 days. Healthy seedlings must have complete cotyledons, 3-5 true leaves, dark green leaves, leaf thickness, stem thickness and other conditions, which are suitable for transplanting.

Seedling raising in the early stage of cucumber planting is very important, and field management in the later stage is also very important. Water must be watered in time when the weather is dry under the condition of water shortage.