First, formula fertilization Zhu Liu will not be able to grow nutrients needed for growth, the metabolism of bamboo will be affected, the external appearance shows some symptoms. Nitrogen deficiency: When bamboo is lacking in nitrogen, the leaves have yellow-green color, and the stems are short and weak. The old leaves of the lower part are yellow and fall off, and the shoot growth stagnates. Phosphorus deficiency: In the absence of phosphorus in bamboo willow, the leaf color appears purple and bronze, and it begins with the tip of the lower old leaf. The bamboo willow is thin, the terminal buds are stunted, the lateral buds are degraded, and the shoots are short. The angle between leaves and branches is small, and the lower leaves of the plants are easy to wither and fall off, and the growth is inhibited. The root system is underdeveloped, with small roots and yellowish brown. Potassium deficiency: When the bamboo is deficient in potassium, the leaf color is dark green or bronzed, or the tip of the leaf is bright yellow, and the tip and leaf margin die first. The bamboo willow grow slowly, the stems will be weak, and the degree of lignification will be low. Calcium deficiency: When bamboo gracilis lacks calcium, the leaves are small and pale green, and young shoots and young shoots die when severe. The new roots are short, curved, and the tip soon dies. Iron deficiency: When the bamboo willow iron, seedlings appear yellow, light yellow, milky white, and gradually develop downward, yellow seedlings. In severe cases, the veins turn yellow-green, brown spots appear on the edges until dead. Boron deficiency: When bamboo borage is deficient in boron, “dry tip†phenomenon occurs, and the leaves are small and lateral buds are not well developed. Manganese-deficient: When bamboo-limonium is deficient in manganese, the first seedling veins appear light yellow-green, and develop from the leaf margin to the midrib. When severe, the leaves turn yellow, and the shoots turn yellow and gradually spread to the whole plant. However, the symptoms of different bamboo will not be the same. There are specific issues to be analyzed and correct conclusions are drawn.
Second, the late fertilizer to see the sky fertilization: when the weather is hot and rainy, in order to avoid loss of nutrients, we must master the principle of a small amount of ground. When the climate is cold, apply organic fertilizers that have been thoroughly decomposed to topdressing them. When the temperature is higher than the normal year, the time for the first fertilizer application may be appropriately advanced. See fertilization: Lime or acidic soils are prone to phosphorus deficiency. Phosphate fertilizer should be increased accordingly. In addition, when topdressing is applied, the amount of sandy land should be small, and the amount of clay land can be increased appropriately. The same amount of fertilizer, sandy soil should be divided into multiple applications, clay can reduce the number and increase the amount of each fertilizer. Different growth and development stages of bamboo willow require different nutrients. In the initial stage of growth, more nitrogen and potassium are required; in the fast growing stage, a large amount of nitrogen and calcium are needed; in the later stage of growth, potassium is the main component, and phosphate fertilizer is supplemented to promote the lignification of stems and branches, and to increase the resistance of bamboo willow to adverse environments.
V. Greenhouse Temperature and Water Management in Seedling Vegetation Temperature and Humidity Standards in All Phases: 1. Seed root development period: from sowing to emergence, about 7~9 days, mainly to cultivate seed roots, this period is generally not watered The temperature in the shed does not exceed 32°C. If the film is covered, the plastic film will be removed after emergence. If the temperature exceeds 35°C, the ventilation on the sides of the greenhouse should be opened and the ventilation should be turned off at 4 to 5 pm. 2. The first complete leaf extension period: It takes about 5 days from the emergence to the first full leaf deployment. During this period, the height of the first leaf sheath is not more than 3 cm above the ground, and the sheath leaf that is co-extensive with the first leaf is promoted by the underground. Root roots of 5 roots, remove 80% of the seedlings when the film is removed, the greenhouse temperature is controlled at 22 ~ 25 °C, the maximum does not exceed 28 °C, timely ventilation and training seedlings; in addition to the seedbed over dry water, generally less or no watering, so that The seedbed remains in a dry field state. 3. Weaning period: from the second leaf tip to the third leaf, it takes about 10~14 days to prevent the stems and leaves from becoming long, and the temperature and moisture are controlled. The temperature in the shed is controlled at 20~22°C. The maximum is not more than 25 °C; If the bed is white and the roots are well developed, the tip of the heart does not spit water in the morning or evening, or the leaf curls in the noon, and it is watered at about 8 o'clock in the morning and drenched once. Before transplanting, according to the weather and the temperature conditions in the shed, more vents should be provided for timely training. The daytime temperature for practicing seedlings generally does not exceed 20°C, and is generally not less than 10°C at night. When nighttime temperature stability passes 7°C, it can be ventilated overnight.
Sixth, nurture strong bred, prevent diseases such as seedlings appear leaf color change, should apply urea fertilizer. Transplanting seedlings are mostly seedlings, northern cold rice requires 30 to 35 days of age, leaf age of 3.1 to 3.5 leaves, plant height of 12 to 15 cm. Science and Technology Information
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