The role of the chlorophyll meter can be divided into two aspects. The first is to predict the future growth and yield of the crop through the current chlorophyll situation, and the second is to understand the nitrogen content of the plant through the chlorophyll content. In recent years, due to the development of electronic technology and sensor technology, chlorophyll measurement technology has made great progress. From the initial need to destroy cell tissue to measure and then to remote sensing measurements.
At present, the field chlorophyll method is widely used in field measurement research. The advanced chlorophyll measurement can help reduce the nitrogen fertilizer consumption by 10% under the premise of ensuring that the crop yield is not reduced; however, it has the disadvantages of high price and single function. The study found that the chlorophyll meter is affected by various factors such as variety, growth period, environmental factors, measuring leaf position and measuring position.
The study found that leaf specific leaf weight (SLW) in addition to SPAD readings (SPAD/SLW), can more accurately estimate the nitrogen content of different growth stages and different varieties of rice leaves; use leaf thickness (T) instead of specific leaf to read the number of reading SPAD ( SPAD/T), the correlation coefficient between SPAD and nitrogen is more significant. Therefore, according to this principle, a chlorophyll meter for chlorophyll determination together with blade thickness measurement is designed. The portable chlorophyll meter is easy to operate, fully functional, and low in power consumption; it can achieve non-destructive and accurate measurement of plant chlorophyll and improve measurement accuracy.
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