Symptoms such as yellow leaves, small leaves, falling flowers and fruit drop are related to deficiency, and this phenomenon is spreading year by year. After expert analysis, there are mainly the following reasons.
First, there are more cloudy days. More cloudy days, lower temperatures lead to vegetable root injury, affecting the absorption of nutrients, showing symptoms of deficiency. In addition, even the lack of light in the cloudy day, resulting in crop malnutrition, carbohydrates can not be converted, the leaves are thicker and smaller, the roots (especially the root tip) are injured, brown, no new roots. If the management of large fertilizers is carried out at this time, there will be more roots in vegetables, and nutrition will not be absorbed normally. Vegetables will inevitably suffer from deficiency. At this time, spraying foliar fertilizer is the most effective solution.
Second, the application of trace elements should not be used. In order to pursue high yields, some vegetable farmers have applied a large amount of fertilizer to the greenhouse, and neglected the application of trace elements, resulting in a general increase in nitrogen, phosphorus and potassium in the soil, and insufficient trace elements. Some vegetable farmers use excessive amounts of micronutrient fertilizers. Because of antagonism, roots absorb other elements and are inhibited, thus showing symptoms of deficiency.
Third, the concentration of soil solution in the shed is too high. Due to the large-scale use of chemical fertilizers by vegetable farmers, the concentration of soil solution is too high, the roots of plants are poorly developed, and sufficient nutrient supply can not be absorbed to grow plants, and the plants show deficiency.
Fourth, prevention is inappropriate. Some vegetable farmers see that the leaves of vegetables are yellow, they are considered to be lack of fertilizer, so they apply a lot of chemical fertilizers, and the results are counterproductive, leading to more and more serious vegetable deficiency. Therefore, the farmers should be given more guidance to distinguish the symptoms of various deficiency.
Diffused Silicon Pressure Sensor
The diffusion silicon Pressure Sensor adopts the diffusion silicon piezoresistive pressure sensor with stainless steel isolation film as the signal measuring element, the signal processing circuit is located in the stainless steel housing, the sensor signal is converted into standard 4-20mA current or RS485 signal output through the professional signal conditioning circuit. Widely used in petroleum, chemical, metallurgy, electric power and other industrial process on-site measurement and control.
Diffused Silicon Pressure Sensor,Silicon Pressure Sensor,Silicon Pressure Transducer,Silicon Diaphragm Pressure Sensor
Xi'an Gavin Electronic Technology Co., Ltd , https://www.gamicos-meas.com