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The role of chlorophyll meter in the application of nitrogen fertilizer in corn

Oct 29, 2018

Corn has a higher demand for nitrogen, and it is more important to apply nitrogen fertilizer reasonably. In addition to determining the amount of nitrogen used by measuring soil nutrients, the chlorophyll content of corn leaves can also be measured by chlorophyll analyzer to understand the demand for nitrogen fertilizer in corn. Common to both methods is the collection and air drying of soil or plant samples, sample comminution and screening, and finally measurement by instrument.


When the chlorophyll tester showed that the corn lacked nitrogen, it was also observed by the naked eye that in the absence of nitrogen, nitrogen was transferred from the older leaves of the corn plant to the younger leaves, resulting in chlorosis of the older leaves. Following this yellowish or "fire", immature leaves begin to age. These symptoms are evident during the silking period of the corn. Conversely, the leaves of plants with excessive nitrogen are dark green and usually the senescence of the leaves is delayed.


Researchers analyzed other test point factors besides nitrogen availability that may affect the accuracy of plant nitrogen deficiency using a chlorophyll tester. Stresses caused by other nutrient deficiencies or pest damage or low temperatures reduce the chlorophyll content in the leaves. Before applying the nitrogen fertilizer in the field or planting high-level nitrogen fertilizer during planting, the nitrogen efficiency of the soil will be temporarily increased. The chlorophyll content will increase when sampling, so it is necessary to measure as many times as possible and take the average.


The purpose of the relevant experiments by chlorophyll analyzer is to determine whether corn chlorophyll is related to relative grain yield and soil nitrogen supply capacity, and to determine whether the chlorophyll meter is suitable for nitrogen fertilizer use.


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