Auto Lamp
Automobile device for giving light, especially one that has a covering or is contained within something. Lighting should be provided with good lighting and should minimize glare. For the headlamp, in order to meet the above two requirements, use the two conditions of distant light and near light. The distant light is a long distance light beam that is used in the front of the car or not following other cars. It is generated by the main filament in the focal point of the reflector and the power is large, and the beam direction is approximately horizontal. In order to ensure the safety of driving, the distance of light distance (detection and identification of obstacles) should be greater than the braking distance to realize the timely parking. The speed limit is applied in most countries, given that the required distance light intensity is proportional to the four times of the speed.
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To this end, field experiments were conducted to study the correlation between the readings of chlorophyll detectors before cropping and the nitrogen content and yield of crops, the response of chlorophyll meter readings to nitrogen application, and the accuracy of chlorophyll meter readings to forecast crop nitrogen supply. Evaluate the effect of crop genotypes on chlorophyll meter readings. In the well-fertilized plot (greater than 200 kg/hm for N application), the trend is the same, and the uppermost part of the lesion without the appearance of damage completely spreads out. From the base of the leaf, the chlorophyll meter reading is measured every 2 cm, and the leaf is divided into each section from the base. The results of the same interval measurement are averaged.
Before the winter wheat jointing, 30 wheats were randomly selected from each plot and the chlorophyll meter readings were measured. After the plants were dried, the dry weight and total nitrogen content were measured. When measuring the chlorophyll detector reading, use the uppermost fully expanded leaf (inverted two leaves) and the second fully expanded leaf (inverted three leaf) in the middle. The midpoint between the leaf margin and the leaf veins is determined side by side, and attention is paid to avoiding veins and Damaged blades.
The results of the chlorophyll detector in the modified test are basically the same as those of the conventional corn sample. For a measurement point with a 55% distance between the blade and the middle, the result is relatively small, but it is determined at a position of 40%-80%. The difference in value is relatively small. The result that can be found in the measurement of the chlorophyll detector is that there is also a large difference between the values ​​measured at other positions for the leaves that are relatively similar. Therefore, when using the instrument in the field test, it is necessary to pay attention to the selection of the position or the result will be biased. Great.
The function of the nitrogen content in plants is more than just the nutrient elements of crops, and it can well reflect the yield of crops. It is a good judgement parameter. However, in actual operation, the steps of detection are tedious and the work is expensive, which is a disadvantage. In recent years, many new studies have presented and used new types of chlorophyll detectors to directly estimate the state of nitrogen nutrient absorption and the amount of nitrogen fertilizer applied. The instrument has many applications in crops such as rice and cotton.