Find out why the yellow leaves in the lower middle of the oil beans
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The reporter went to the shed of Zhang Jiancheng's master and found that the lower middle leaves of the oil beans were yellow, fall off, and the leaves were light in color, which was obviously different from normal aging leaves. After careful observation of the diseased leaves, the reporter found neither obvious lesions nor rot or mildew. Therefore, it was judged that this was not caused by an invasive disease. The causes of physiological yellow leaves are often lack of nutrients, wounds, gas or phytotoxicity.
According to Mr. Zhang Jiancheng’s introduction, the previous oil bean had fewer diseases and was not over-sprayed. It simply sprayed agricultural streptomycin and chlorothalonil to prevent disease. Therefore, it was unlikely that the yellow leaves would be caused by the phytotoxicity. The yellow leaves caused by gas damage generally occur in the initial stage of planting. Unfamed organic fertilizers release harmful gases such as ammonia gas and damage the near-ground leaves. Now that the oil beans have reached the late stage of growth, it cannot be said that gas damage has caused yellow leaves. .
The reporter carefully pulled out the roots of the oil beans and rinsed them with clean water. No browning or rot was found in the roots, which ruled out root damage caused by root diseases. Since the above possibilities have been ruled out, there is only a shortage of resources. Under normal circumstances, large areas of middle and lower leaves may be lack of nitrogen or magnesium deficiency. Master Zhang told the reporter, “Adding a lot of organic fertilizer and trace element fertilizer in the base fertilizer before oil bean colonization, it should not be caused by lack of nutrients.†However, the lack of symptoms of plant expression must represent the lack of such elements in the soil. ? This is not the case. There is also a possibility that the root system will be blocked or absorbed when these elements are absorbed, so that the normal growth needs of the plant cannot be satisfied, and then the symptoms of nutrient deficiency occur.
After careful analysis, the reporter summed up the following two reasons leading to the lack of plants:
1. Roots are stunted. Although the root bean rot was not found in Zhang Jiancheng's shed, the root system was relatively weak and the capillary root group was not strong enough. Roots are poorly developed at the seedling stage and early growth stage, and cannot provide a strong nutrient supply guarantee for a large amount of scabs in the middle and later stages, thus resulting in the absorption and supply of nutrients for nutrition. In addition, Master Zhang’s nutrition supply in the later period is not timely and insufficiently, resulting in This phenomenon. Therefore, seedlings must pay attention to seedlings, if not seedlings or seedlings too short time, the plant can not form a strong root system, it will affect the growth of plants in the late, easy to produce a variety of invasive and physiological diseases. Reporters found in interviews with the countryside that this is easily overlooked by many people!
2. The temperature is too high and soil drought affects the absorption of water by roots. Walking into Zhang’s shed, the reporter found that the temperature in the shed was relatively high, the transpiration of the plant was strong, the loss of water evaporation was large, and the soil was arid, which exacerbated the predicament of inadequate nutrient supply.
Therefore, the reporter suggested that Zhang Jiancheng’s current master should rush to apply alginic acid, chitin, or humic acids to protect the tree and produce good fertilizer, promote new root germination, improve root absorption capacity, and cooperate with spraying balanced amino acids. Fertilizer, timely nutrition.