Key Points Of Hybrid Rape Seedbed Management Technology

By Author: doris zhang
Total Articles: 76
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Cultivating healthy seedlings of appropriate age is the basis of whether hybrid rape can obtain high yield. To cultivate age-appropriate strong seedlings, we must pay close attention to the management of rape seedbed and earnestly implement the following technical measures:

1. And time seedlings and fixed seedlings: hybrid rape grows fast in seedling stage. If it is less than time seedlings, it is easy to form a large number of high foot seedlings and curved root seedlings, resulting in poor seedling quality, less branches and low yield. The number of inter seedling should be 3 times. For the first time, a part of cluster seedlings were removed; The second time was conducted after the birth of the second true leaf. Some weak seedlings, young seedlings, sick seedlings and miscellaneous seedlings were removed, so that the leaves did not take up the leaves and the seedlings did not rely on the seedlings, and weeds were removed at the same time. After the third true leaf grows, the third thinning and seedling fixing shall be carried out, and the principle of "four elimination and four retention" shall be specifically achieved, ...
... that is, to remove the weak and retain the strong, to remove the dense and retain the rare, to remove the disease and retain the healthy, to remove the small and retain the large. Pull out long necked seedlings, cluster seedlings, pit seedlings, few leaf seedlings, high foot seedlings, diseased leaf seedlings and moth eaten seedlings; Leave short necked seedlings, multi leaf seedlings and collapsed seedlings, and healthy seedlings with vigorous growth. The reserved seedling density depends on different seedling ages and varieties. Generally, the reserved seedling density of the seedling bed with a seedling age of about 35 days is 13 ~ 15 plants per square foot, which basically ensures that 80000-100000 strong seedlings can be produced per mu of seedling bed.

2. Scientific topdressing: when the seedlings grow the first true leaf, they can be watered with an appropriate amount of rotten thin human and animal manure water or 0.5% urea water in combination with drought resistance. Apply seedling fertilizer once at 2-3 leaf stage, and apply about 15 loads of rotten thin human and animal manure water per mu of seedling bed or about 5kg of urea mixed with water. Before transplanting, depending on the seedling condition, apply additional fertilizer once to send married fertilizer.mobile vertical farm

3. Moderate watering: in order to promote seedling emergence, attention should be paid to keeping the border moist. It is best to shade with straw mulch for 2-3 days after sowing, but the straw mulch should be removed in time after seedling emergence, so as to facilitate the healthy growth of vegetable seedlings under the sun. In the seedling stage of rape, a small amount of frequent watering should be done in the early stage. Combine water and fertilizer in the middle stage and less watering in the later stage, so as to ensure that the seedbed is wet and the vegetable seedlings grow steadily.

4. Pay attention to the prevention and control of diseases and insect pests: the main insect pests in the seedling stage of rape include vegetable aphid, cabbage caterpillar, etc. It is easy to take cabbage caterpillar when it rains for a long time. It can be controlled by spraying 2% grams of avermectin 35-50 grams or 5% grams of methaveramin 10 kg to 50 kg of water per acre. Aphid is easy to occur when the weather is fine. It can be prevented by spraying 25% g of 20-25 per gram of water, 50 kg of water, or 3000 times of 2.5% enemy killing emulsion. There are mainly viral diseases in seedling stage. 40% MB or 70% MB Zn 75-100 ml per mu is used to prevent and control spray.

5. Chemical control: when rape grows to the three leaf stage, 50 g of 15% Paclobutrazol or 20 g of 5% Uniconazole shall be sprayed evenly with 50 kg of water per mu of seedling bed, and do not spray again and again. After the application of Paclobutrazol, the plant height of rape became shorter, the root neck became thicker, the leaves thickened and the photosynthesis increased, which was conducive to improve the quality of seedlings and enhance the cold and stress resistance of rape.

6. Transplanting in time. When the seedling age of rape reaches about 30 days, conditions should be created to plant as early as possible to facilitate early development. "Three belts" shall be achieved during transplanting, that is, the married fertilizer shall be sent (the seedling application shall be observed one week before transplanting, and the upper force shall not be colored); With medicine (mainly aphid medicine); Bring soil (pour enough water on the seedling bed overnight to bring more vegetable seedlings with their mother's soil), so as to promote the early survival and early emergence of vegetable seedlings after transplanting.