เซนเซอร์วัดความชื้นในดิน + วัดความสว่างของแสง + วัดค่า pH สามารถเลือกโหมดในการอ่านค่าได้เมื่อเสียบลงพื้นดินเข็มมิเตอร์จะแสดงค่าที่ต้องการวัด ไม่ต้องใช้แบตเตอร์รี่ ให้ค่าเป็นแบบอะนาล็อกแบบเข็ม สามารถต่อกับ Arduino ได้โดยตรง การต่อใช้ขั้วบวกของจอต่อกับขา Analog ของ Arduino และขั้วกราวน์ต่อเข้ากับขา GND ของ Arduino
When measuring the pH and humidity of the soil first insert the probe into the soil as far as possible, leaving about 1 cm on the top of the probe.
Move the button on the pen to MOIST, MOIST is the moisture button, the corresponding table is MOIST, DRY is dry, WET is wet, the value 1-3 (red part) indicates that watering is required, 4-7 (green part) It is suitable, please adjust the watering time according to the variety of plants, 8-10 (blue part) is too wet.
Push the button on the pen to PH, PH is the pH key, the corresponding table is 8-3.5 value, ALKALINE is alkali, ACDIC is acid, the value 7 is basically neutral, the smaller the value, the higher the acidity, please according to the plant The variety adjusts the soil pH.
Precautions
1. When using it, be careful not to touch the stone when inserting the electrode. Do not use excessive force, otherwise it will easily damage the electrode.
Wash the electrode in time after use. (It is strictly forbidden to directly penetrate into the water to measure).
2. Can not be used in the soil for a long time! So as not to damage.
Soil pH
Soil pH is also known as “soil reaction”. It is the acid-base reaction of the soil solution. It depends mainly on the concentration of hydrogen ions in the soil solution and is expressed in terms of pH. The solution having a pH of 7 is a neutral solution; the pH is less than 7, which is an acidic reaction; and the pH is greater than 7 is an alkaline reaction.
Soil pH can generally be divided into the following stages:
<4.5 Very strong acidity
4.5-5.5 Strong acidity
5.5-6.5 Acidity
6.5-7.5 Neutral
7.5-8.5 Alkaline
8.5-9.5 Strong alkaline
>9.5 Very alkaline
Soil pH has great influence on soil fertility and plant growth. Many soils in northwest and north China have large pH values, while southern red soils have small pH values. It is therefore possible to grow crops and plants that are compatible with soil pH. For example, in the red soil area, tea trees with good acidity can be planted, and the alkali resistance of alfalfa is strong.
What is the optimal range of soil pH for common crops?
Soil pH has a great relationship with plant nutrient availability, soil structure and crop growth. First, the organic nutrients in the soil must be involved in the activities of the soil microbes, so that they can be converted into quick-acting nutrients for plant absorption, while most of the micro-organisms involved in the decomposition of organic matter grow in a near-neutral environment, so the soil nutrients are effective. Sex is generally best when approaching a neutral reaction. Second, soil pH has an impact on soil structure. In the acidic soil, the hydrogen ion concentration and the calcium ion are exchanged for leaching, so the acid soil is easy to be knotted. The alkaline soil contains a large amount of substitutional sodium ions and hydroxide ions, which disperse the soil particles and dry the plate, resulting in poor structural properties of the alkaline earth. In addition, soil pH is also closely related to plant growth. In nature, some plants have strict requirements on soil acid-base conditions. They can only grow in a specific range of acids and bases. These plants can be used as indicators for soil pH, so they are called indicator plants. For example, Azalea can only grow on acidic soil, which is called indicator soil of acid soil; cypress is an indicator plant of calcareous soil, and Suaeda is an indicator plant of alkaline soil. Different cultivated plants also have different optimal pH ranges (see table below). Knowing their optimal growth range, we can choose suitable crops according to soil pH, or adjust soil according to crops. pH to the right range.
The best soil pH for major crop growth
Crop name pH crop name pH base crop pH
Rice 6.0-7.0 Peanuts 5.0-6.0 Chestnut 5.0-6.0
Wheat 6.0-7.0 Tobacco 5.0-6.0 Watermelon 6.0-7.0
Corn 6.0-7.0 Tea 5.0-5.5 Cabbage 6.0-7.0
Soy 6.0-7.0 Potato 4.8-5.4 Tomato 6.0-7.0
Sugar cane 6.0-8.0 Orange, Mandarin 5.0-7.0 Pumpkin 6.0-8.0
Sweet potato 6.0-6.0 Lychee 6.0-7.0 Cucumber 6.0-8.0