A few days ago, Wang Jian, head of Ruifengyuan Fruit and Vegetable Specialty Cooperative in Xiangzhao Village, Xiajin County, Shandong Province, reflected that this year the cucumber is really called “cucumberâ€, and the green melons are all yellow. By the author's on-site observation, it was found that there were no lesions on cucumber leaves and melon strips, which could rule out the possibility of invasive diseases and judged as a physiological disease. The final conclusion is that the main cause of the yellowing of cucumbers is poor root development. The following measures can be taken to deal with them:
First, immerse the water before planting
Many vegetable farmers are eager to facilitate planting, often by first planting in dry soil and then watering. The disadvantage of this approach is that although there is sufficient water and fertilizer in the surface layer of the soil, the ground temperature is likely to decrease, and the root system only develops in the shallow surface, but it is unfavorable for the development of the root system in depth. If watering first before planting, it can induce the roots to develop in depth. At the same time, after watering, the water can be closed and then the greenhouse can be heated. After the planting, the temperature will not be too low, which is more conducive to root growth and seedlings.
Second, remove the lower leaves not too early
The nutrients needed for the root system are mostly provided by the middle and lower leaves, so it is not appropriate to remove the lower leaves prematurely to promote rooting, and to strictly prevent and control the diseases of the leaves to ensure the normal photosynthesis of the leaves.
Third, rational fertilization and root protection
After proper application of basal fertilizer, deep application of biological fertilizers at the planting sites can improve the soil, prevent diseases, promote new roots, and promote the development of roots in deep roots. After the cucumber enters the period of squashing, the vegetative growth and the reproductive growth are synchronized. When the fertilizing material is used to ensure that the root system is not damaged, it is necessary to take into account the attack of the tree, but also to pay attention to the melon strip. Therefore, it is not appropriate to apply excessive nitrogen fertilizer. High-quality compound fertilizer. In addition, if the temperature is too high, the amount of chemical fertilizers should be reduced, and biological fertilizers should be added to ensure the normal growth of the root system.
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