China's soil acidity is divided into five levels: strong acid soil (pH is less than 5), acidic soil (pH5.0-6.5), neutral soil (pH6.5-7.5), alkaline soil (pH7.5-8.5), Strong alkaline soil (pH greater than 8.5). Jinping County passed the "PH soil testing and fertilization project" PH analysis of 4787 soil samples showed that most of the land mass is mostly acidic soil and neutral soil, a small number of strong acid soil, very little alkaline soil, when cultivated crops, first of all Knowing the proper pH range of the crops to be cultivated is to prefer acidic soils, neutral soils, or alkaline soils. The adjustment of the soil is performed by adjusting the pH of the soil to the extent that the soil pH is inappropriate.
The soil regulation method is:
1, the soil acidity is too large (1) can be applied per acre per acre 20 to 25 kg of lime, and sufficient farmhouse fertilizer, should not only apply lime without farmyard fertilizer, so the soil will turn yellow and thin. Apply 1-3 months before sowing to avoid affecting the germination and growth of the crop. (2) 40-50 kg of wood ash can also be used to neutralize the acidity of the soil to better regulate the water and fertilizer conditions of the soil.
2. For alkaline soils, usually 30 to 40 kg per mu are used as base fertilizer for improvement.
3, when the soil is too alkaline, you can add a small amount of aluminum sulfate (application of phosphate fertilizer to be added), ferrous sulfate (see effect, but the role of time is not long, the need for regular application), sulfur powder (see slow, but the most lasting effect) , Humic acid fertilizers, etc., the specific application rate is determined according to the soil pH. Often pouring some diluted water of ferrous sulfate or aluminum sulfate can make the soil more acidic. Humic acid fertilizer contains more humic acid, which can adjust the pH of the soil. Aluminum sulfate is also used to adjust the pH of the soil because it hydrolyzes to aluminum hydroxide and produces a small dilute solution of sulfuric acid.
4. If there are crops in the plots of land, acidic and alkaline fertilizers can be added to adjust the pH of the soil. Replacing hydrogen ions with basic elements such as calcium and magnesium to increase the pH can also provide nutrients to crops. (1) Addition of organic fertilizer: It is the most fundamental measure to adjust the pH of soil, and it is trying to improve the buffering performance of the soil. Soil buffering is closely related to the content of humus in soil, and humus is mainly derived from organic matter. Therefore, organic fertilizer must be emphasized in agricultural production. (2) Appropriate application of chemical fertilizers: Based on the application of organic fertilizers to improve soil buffering performance, chemical fertilizers should be reasonably applied according to the degree of soil acidity and alkalinity and fertility. In general, acidic soils are selected for alkaline fertilizers such as ammonium bicarbonate, and phosphate fertilizers are selected for calcium, magnesium, and phosphate fertilizers. Alkaline soil, choose to apply soluble acidic fertilizers, such as ammonium chloride, superphosphate and so on. Urea is a neutral organic nitrogen fertilizer, can be applied to the acid-alkali soil, but after 3-5 years after the application of irrigation, to prevent loss, improve fertilizer efficiency. (3) Applicable lime: Soil with strong acidity (below pH 5.5), soil viscous weight, and high organic matter content should be suitably increased with lime. Generally about 50-100 kg per mu, about once every 2-3 years; alkaline strong soil, can be applied to gypsum (calcium sulfate) 15-25 kg, adjust its alkalinity.
IT02S, is JRT new product in the early 2019, which is a single-point LiDAR sensor, also called tof distance sensor. With a micro size of 46x17x7mm, customers can widely use in many Laser Measurement Solutions. The lidar distance sensor can measure 12m short-range with high frequency up to 100hz. It's great for Unmanned Aerial Systems. If you need us send you data sheet and spec for this products, offering sample as well, pls tell us, thank you.
Accuracy
+/-8cm@ 0.1~3.5m
Measuring Unit
cm
Measuring Range (without Reflection)
0.1-12m
Measuring Time
0.1~3 seconds
Measuring Frequency
100 Hz
Laser Class
Class II
Laser Type
650nm, <1mw, red
Weight
About 5g
Voltage
DC2.5V~+3.5V
Serial Level
TTL 3.3V
Size
46*17*7mm
Operating Temperature
0-40 ℃ (32-104 ℉ )
Storage Temperature
-25~60 ℃ (-13~140 ℉)
IT02S Mini Tof Sensor Module Diagram
Parameters of IT02S:
IT02S – the High performance-price ratio measurement solution
* low power consumption of single transmit and single receive
* small size: 46*17*7mm
* low cost
* proffessional techinical support
2D Laser Distance Sensor,2D Lidar Sensors,Tof Lidar Distance Sensor, Flight Distance Sensor
Chengdu JRT Meter Technology Co., Ltd , https://www.irdistancesensor.com