The seedlings of young seedlings have less growth, slower leaf development, new leaf color, grayish-green leaves, thicker leaves, shrinkage, and stiff tissue; yellow cotyledon and true leaves, yellowish underground roots, and even browning, with little new white roots. The stiff seedlings are different from the growth points produced by improper use of foliar fertilizers and pesticides to stop growing, the leaf shape becomes smaller, the leaf margins rewind, the leaves become thicker, and the symptoms of shrinkage and twisting are greater.
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Once the seedlings of the watermelon seedlings have been sterilized, the recovery will be very slow, which will delay the favorable growth season and seriously affect the yield and benefits. Stiff seedlings are the main physiological obstacles for watermelon seedlings.
Causes: 1 The temperature of seedbed is low, especially the soil temperature is low, which can not meet the basic temperature requirement of watermelon root system. 2 The seedling bed has a heavy soil mass and a high soil moisture content. It is difficult to root in humid and poorly ventilated root zone conditions, and the roots have poor absorption capacity. Continuous raining after planting and severe seedlings are particularly serious. 3 Nutrition soil is not properly prepared. Application of seedlings or planting holes without organic decomposition or organic fertilizer do not cause excessive burning of roots or application of chemical fertilizers, or chemical fertilizers applied to the roots closer to the soil solution concentration and damage the root. 4 poor seedling quality. When planting, the seedling age is too long. In the process of planting, there is too much root damage, or the soil preparation and planting operation are rough. The roots are overhead, the roots are not in close contact with the soil, and the hair roots are affected. 5 Underground pests damage the roots of the roots and cause serious injury or death.
Prevention and control measures: 1 Select a loose, well-ventilated pastoral soil or paddy field soil as a nutrient soil, and try not to use the soil muddy heavy river mud. 2Improve the nursery environment, use the geothermal line or mulch to cover the seedlings, raise the ground temperature, cultivate and grow normally, develop the roots well, and have moderate seedling age (30 to 35 days for self-rooted seedlings and 40 to 45 days for grafted seedlings). 3 Apply rotten organic fertilizer to the seedbed, lightly apply compound fertilizer away from the root, or spray foliar fertilizer to prevent root damage. 4 timely watering, so as not to reduce seedbed temperature and ground temperature, adverse root growth. 5 When planting, high sorghum deep trenches should be used to strengthen drainage, and a point fertilizer (decomposed organic fertilizer and chemical fertilizer) should be added appropriately to promote root growth. 6 pay attention to hardening seedlings before transplanting. 7 timely colonization, to prevent the impact of low temperature after planting, select the cold tail warm sunny day colonization. 8 Prevent ants and other underground pests.
Waterloo watermelon seedlings grew too strong, appearing leggy, showing internode elongation, petiole and leaf body lengthened, light green leaves, leaf thin, soft tissue.
Reasons for the occurrence: lack of light in the watermelon seedbed, high temperature, high soil and air humidity, grafted watermelon breeding process, rootstock, scion in the temperature, light, gas control is not the case, prone to seedlings seedlings. The leggy seedlings have poor adaptability to low temperature and are prone to frost damage.
Prevention measures: Reasonable adjustment of light, temperature and humidity. The seedbed temperature is divided into sections for timely ventilation, dehumidification, increased light, and avoidance of excessive temperatures. Reduce the night temperature and increase the temperature difference between day and night. Under conditions of insufficient light, reduce the temperature and humidity appropriately.