Rape seeding to prevent "five seedlings"
Tall seedlings It is the most common and most easily formed abnormal seedling in rapeseed bed. The main reason for the formation of tall seedlings is that the seeding volume is too large, the fertilizer and water are too much, and the seedling age is too long. As a result, the main stem has been elongated in the seedbed, and the early and mid-maturing varieties are particularly serious. This kind of seedlings is easy to fall after transplanting into the field, easy to leave the leaves and expose the neck. Once it encounters the cold current, the stems are easily frozen and cracked, which will lead to high branches and high yields. Therefore, there is a tendency to grow crops in due course. The seedlings are sprayed with paclobutrazol at the 3-leaf stage, generally with 15% paclobutrazol per acre 50 grams, spraying 40-50 kilograms of water, can prevent the tall seedlings formed in the rape field. Prematurely too late Premature sowing temperature is higher, the leaves grow faster, the seedlings grow longer, and the winter is vulnerable to freezing damage; too late sowing, the temperature is low, the leaf speed is slow, unfavorable autumn and winter strong. Acting seedlings Occurred in the case of excessive use of available nitrogen fertilizer, high temperature and high humidity conditions, it is easy to cause growth and excessive growth, the formation of leggy seedlings. As the growing trend is strong, the organization is tender, and the resistance is not strong. After transplanting into Daejeon, the leaves often wither a lot, turning green slowly, making seedlings late, and being susceptible to freezing, which is not conducive to strong winter spring hair. The prevention method is proper sowing and control. Fertilizer, and time seedlings, Dingmiao. For the seedlings with prosperous tendencies, 50 to 100 ppm of Chlorothorean spray can be used for 4 leaves and 1 heart. Thin and thin seedlings, also known as "shady foot seedlings" Mainly due to seedbed conditions, seedlings crowded shade and lack of light, grow thin and weak, chlorophyll less, the prevention approach is to prepare enough seedbeds, the general seedbed should account for about 20% of the planting area, seedbed fertility and other elections, texture loose, drainage and irrigation convenient . After emergence and time seedlings, seedlings can not emerge seedlings, seedlings can be set at the 3 leaf stage, once each seedlings, should be poured once the fertilizer and water to benefit strong seedlings. Dwarf plantlets Also known as stiff seedlings, mainly seedling bed soil is infertile, fertilizer and water supply is insufficient, or long-term waterlogging seedbed, poor root development, or sowing too late, seedling growth in the seedbed is insufficient, but also by the low temperature due to cold waves. The seedlings have short stems, fine roots and necks, few leaves, small and short leaves, and low chlorophyll content. As a result, photosynthesis is weak, growth is stagnant, and the leaf color is red. After transplanting, it is difficult to turn blue hair, and it does not reach winter. Strong spring production requires high yields and low yields. The prevention method is suitable for seedling age, and 35-40 days is appropriate for seedlings of early and mid-maturing varieties to prevent drought and prevent flooding. This prevents the development of seedlings from being impeded by drought and prevents the development of seedlings, resulting in the formation of sterile seedlings, insufficient seed bed base fertilizer and seedbed growth. In the period of severe shortage of fertilizer and water supply, it is necessary to promptly spray fertilizer on the leaves or topdressing the soil in order to make up for lack of land and promote rapid growth. A greenhouse(also called hothouse)is a building or complex in which allow for greater control over the growing environment of plants. Depending upon the technical specification of a greenhouse, key factors which may be controlled include temperature, levels of light and shade, irrigation, fertilizer application, and atmospheric humidity. Greenhouse may be used to overcome shortcomings in the growing qualities of a piece of land, such as a short growing season or poor light levels, greenhouses are often used for growing flowers, vegetables, fruits, transplants and seedlings. Greenhouses can be divided into glass greenhouses and plastic greenhouses. Plastics mostly used are polyethylene film and multiwall sheets of polycarbonate material, or PMMA acrylic glass. Commercial Glass Greenhouse are often high-tech production facilities for vegetables or flowers. The glass greenhouse are filled with equipment such as screening installations, heating, cooling and lighting, and may be automatically controlled by a computer. Agriculture Greenhouse,Plastic Film Greenhouse,Glass Greenhouse,Pc Board Greenhouse JIANGSU SKYPLAN GREENHOUSE TECHNOLOGY CO.,LTD , http://www.spgreenhouse.com