In winter, how to use water and fertilizer management to ensure high yield of cucumber in greenhouse in north China?

Compared with open field cultivation, greenhouse cucumber cultivation has become the mainstream cultivation mode at present because it is not limited by seasons. The problem of water and fertilizer management of cucumber in greenhouse in northern winter is actually a relatively extensive problem, because cucumber cultivation in greenhouse is divided into autumn and winter crops, winter crops and winter and spring crops, and the winter growth period and water and fertilizer management are different, so it should be treated differently.

First, water and fertilizer management of cucumber in autumn and winter

Cucumber seedlings, an autumn and winter crop in greenhouse, are usually sown in the middle and late August to early September, picked in the middle of June at 5438+ 10, and pulled out after New Year's Day.

The early stage of cucumber planting in autumn and winter has higher temperature and longer illumination time, so water and fertilizer can be supplied in time to promote the growth of cucumber seedlings. 9~ 10 days after sowing, watering 1 time is called seedling slow water. Topdressing the root melon for the first time after setting, and topdressing urea15 per mu; After that, water every 5 days 1 time, and fertilize every 10 day/time. Water and fertilizer should be controlled at 1 1 after the end of June to avoid cucumber root retting caused by factors such as low ground temperature, weak root absorption capacity, continuous cloudy and low temperature, and lack of sunshine. In this case, 0.2% potassium dihydrogen phosphate solution can be sprayed on the leaves for root topdressing.

Second, water and fertilizer management of cucumber in winter

Greenhouse cucumber cultivation is the main crop of greenhouse cucumber cultivation. Generally, the seeds are sown in the middle and late September ~ 65438+1early October, sown in the late June ~165438+1early October, harvested in the middle and early February of 65438+,and the seedlings are pulled out in May and June of the following year.

Water 1 time every 10~ 15 days from picking, and apply urea and potassium dihydrogen phosphate 5~6㎏ or high-quality fertilizer 10㎏ per mu in combination with watering. At the peak of melon production, apply 8 ~10 instant compound fertilizer per mu, and spray photosynthetic micro (bacterial) fertilizer or foliar fertilizer 1~2 times on the leaves to prevent premature senescence of leaves. Conditional areas can also apply carbon dioxide gas fertilizer at 9: 00 ~ 1 1:30 on sunny days. The specific watering time should be determined according to the weather, soil moisture and plant growth, and the watering opportunity should be grasped. In the continuous sunny morning, warm water should be poured under the film, and small water should be used frequently. Spray bactericide before watering, and ventilate in time a few days after watering.

Watering in winter should be carried out in sunny morning, so as to avoid watering in the evening or even cloudy day, so as to avoid increasing air humidity and causing the occurrence and spread of pests and diseases.

The above is the water and fertilizer management of cucumber in autumn and winter and cucumber in winter. Different stubble temperature, light and other conditions also make it different. Therefore, water and fertilizer management should be treated differently and cannot be generalized.