The lowest temperature condition for the chilled root elongation and lateral root regeneration of watermelon is 13°C. Generally, the normal hairy root requires 18°C ​​ground temperature. Transplanting melon seedlings in early spring often encounters a situation where the ground temperature of 10 cm below the ground does not reach 15°C and rooting does not occur. The transplanting should be carried out before the ground temperature is increased or the root-promoting measures are taken using measures such as decalking and spraying of rooting powder.
Second bogey old seedling transplanted watermelon normal transplanting age is four leaf stage. Seedling hours due to small growth, poor adaptability and resistance to the outside world, slow seedlings slow. The excessive age of seedlings (more than five leaves) will also cause adverse effects such as woody plugs and hollowed medullary parts in the roots and stems of the ground. Therefore, the slow seedlings will be affected.
3. Avoid water shortage and watering seedbeds. Discomfort Traditional methods of transplanting often result in corkation of the root epidermis and scattering with the root nutrient soil, which can cause severe rooting. The flood irrigation after transplanting will reduce the ground temperature and make the ridge compaction. After watering, it will make the seedling soil and bed not well combined, and the air permeability of the transplanted bed will also affect the root growth. The correct method is to control the temperature of the seedbed before transplanting to control the water, in order to maintain the health and integrity of the root system. After transplanting, in order to maintain the ground temperature, it is necessary to close the bed and the soil after the water is poured or the dark water is poured. .
Four avoid base fertilizer use raw manure and base fertilizer mixed with soil uneven watermelon transplanted, the roots are not familiar with the organic fertilizer and excessive concentration of chemical fertilizers will "burn root", and postponed seedlings or cause dead seedlings. Therefore, the application of organic fertilizers such as chickens, pigs, cow dung must be fully cooked before application, and the base fertilizer should be fully blended with the field bed soil.
Fifth, avoid neglect of soil treatment In recent years, the scale of production of watermelons has been expanded and the increase of crops' biological production has increased the stock of pathogens and pests in the soil. For example, pathogens such as Fusarium oxysporum and spores of anthracnose pathogens will advance as the ground temperature increases. If you ignore the prevention and control of soil pests and diseases will have serious consequences. The ridge ditch, the use of carbendazim, thiocarba and trichlorfon, phoxim and other broad-spectrum bactericidal, insecticidal agents, poison valley will play a good effect.
Six bogey winds discomfort precocious watermelon cultivation measures, such as the use of sheds and other measures to increase temperature and heat preservation. Watermelon seedlings are not in direct contact with the measures. Watermelon seedlings can tolerate high temperatures of 38°C and low temperatures of around 10°C when they are not in direct contact with the shed film. Exceeding this temperature limit can cause roasted seedlings or cold damage.
Seven bogey too early to top-dressing, watering watermelon seedlings fertilizer water should be based on the situation of the seedlings and soil fertilizers determine the amount of fertilizer. The water supply for the watermelon seedlings should generally be followed by a suitable amount of nitrogen fertilizer and foliar fertilizer, which will promote the early growth of the watermelon, and the premature supply of water and fertilizer is often harmful.
Second bogey old seedling transplanted watermelon normal transplanting age is four leaf stage. Seedling hours due to small growth, poor adaptability and resistance to the outside world, slow seedlings slow. The excessive age of seedlings (more than five leaves) will also cause adverse effects such as woody plugs and hollowed medullary parts in the roots and stems of the ground. Therefore, the slow seedlings will be affected.
3. Avoid water shortage and watering seedbeds. Discomfort Traditional methods of transplanting often result in corkation of the root epidermis and scattering with the root nutrient soil, which can cause severe rooting. The flood irrigation after transplanting will reduce the ground temperature and make the ridge compaction. After watering, it will make the seedling soil and bed not well combined, and the air permeability of the transplanted bed will also affect the root growth. The correct method is to control the temperature of the seedbed before transplanting to control the water, in order to maintain the health and integrity of the root system. After transplanting, in order to maintain the ground temperature, it is necessary to close the bed and the soil after the water is poured or the dark water is poured. .
Four avoid base fertilizer use raw manure and base fertilizer mixed with soil uneven watermelon transplanted, the roots are not familiar with the organic fertilizer and excessive concentration of chemical fertilizers will "burn root", and postponed seedlings or cause dead seedlings. Therefore, the application of organic fertilizers such as chickens, pigs, cow dung must be fully cooked before application, and the base fertilizer should be fully blended with the field bed soil.
Fifth, avoid neglect of soil treatment In recent years, the scale of production of watermelons has been expanded and the increase of crops' biological production has increased the stock of pathogens and pests in the soil. For example, pathogens such as Fusarium oxysporum and spores of anthracnose pathogens will advance as the ground temperature increases. If you ignore the prevention and control of soil pests and diseases will have serious consequences. The ridge ditch, the use of carbendazim, thiocarba and trichlorfon, phoxim and other broad-spectrum bactericidal, insecticidal agents, poison valley will play a good effect.
Six bogey winds discomfort precocious watermelon cultivation measures, such as the use of sheds and other measures to increase temperature and heat preservation. Watermelon seedlings are not in direct contact with the measures. Watermelon seedlings can tolerate high temperatures of 38°C and low temperatures of around 10°C when they are not in direct contact with the shed film. Exceeding this temperature limit can cause roasted seedlings or cold damage.
Seven bogey too early to top-dressing, watering watermelon seedlings fertilizer water should be based on the situation of the seedlings and soil fertilizers determine the amount of fertilizer. The water supply for the watermelon seedlings should generally be followed by a suitable amount of nitrogen fertilizer and foliar fertilizer, which will promote the early growth of the watermelon, and the premature supply of water and fertilizer is often harmful.
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