The ultrasonic level sensor integrates non-contact switch, controller and transmitter into one, suitable for small storage tanks. Ultrasonic liquid level sensor flexible design can be used in the integrated system or a substitute float switch, electrical conductivity and static pressure type sensor, and also suitable for the fluid flow control and chemical feed system of integrated application of ultrasonic liquid level sensor is widely used in all kinds of atmospheric storage tank, tank, small cans and small container, the pump lift stations, waste water storage tank, etc. Ultrasonic Level Sensor,Ultrasonic Fuel Level Sensor,Ultrasonic Liquid Level Sensor,Ultrasonic Water Tank Level Sensor Xi'an Gavin Electronic Technology Co., Ltd , https://www.cngamicos.com
First, the main symptoms of nitrogen deficiency are: new branches are short and short, leaves are small, erect, leaves are grayish green, petioles, veins and cortex become red; flowers are small, fruit is early and easy to fall off; fine roots are large, small roots are less, new roots Yellowing, reduced resistance to pests and diseases and drought resistance. In the case of soybeans, nitrogen deficiency in the growth period begins with the lower leaves, and the leaves become lighter and pale green. Later, they gradually turn yellow and dry, and sometimes bronze spots appear on the leaves. In severe cases, the plants stop growing and the leaves gradually fall off.
2. Phosphorus deficiency In the early stage of crop growth, the role of phosphate fertilizer is not obvious, but in the middle and late stages, phosphorus deficiency will affect the effective accumulation of nitrogen and protein synthesis. Phosphorus deficiency in different crops has different symptoms.
1. The phenomenon of phosphorus deficiency in wheat is: the seedling grows slowly, the root system is poorly developed, the tiller is reduced, the base of the stem is purple, the leaf color is dark green, slightly purple, the ear small particles are small, and the 1000-grain weight is significantly reduced.
2. The performance of phosphorus deficiency in maize is: slow growth in seedling stage, obvious symptoms in the 5th leaf stage, purple-red leaves, short and small corn cobs, curved shape, premature baldness, most of the seeds are not full.
3. The performance of soybean deficiency of phosphorus is: the leaf color becomes darker, it is dark green or black green, the leaf shape is small, sharp and narrow, and it stands upright, the plant is small and the growth is slow. In severe cases, the stem may appear red, and if the soybean is deficient in phosphorus after flowering, the leaves will appear brown spots.
4. The performance of phosphorus deficiency in fruit trees is: poor fruit quality, slow growth, sparse leaves, yellowish brown leaves, prone to early shedding.
3. Potassium deficiency Different crops lack potassium and their symptoms are different.
1. The tip of the lower part of the general crop turns yellow, gradually yellowing along the edge of the leaf, and the veins on both sides and the midrib are still green. In severe cases, most of the leaves are yellow and the edges of the leaves are burnt.
2. The cereal crops showed weaker tillering power, soft stems and easy lodging.
3. The leaves of the dicot are curled, gradually shrinking, and sometimes the leaves are broken, but the middle part of the leaves remains green.
4. The quality of the root crop is reduced and the quality is poor.
5. The fruit ripening period is inconsistent, the pulp is increased in wood, and the taste is so bitter and not delicious.
How to judge crop deficiency
As the saying goes: crops (food, vegetables, melons and fruits) need three treasures, and nitrogen, phosphorus and potassium fertilizers are indispensable. In the process of planting crops, farmers' friends can get a bumper harvest according to the different characteristics of the crops and the actual demand for nitrogen, phosphorus and potassium fertilizers. So, how do you judge the crop deficiency?
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