The chlorophyll meter is used to measure the chlorophyll content in plant leaves, and the chlorophyll content is used to determine the nitrogen element deficiency. In the current comparison, the operation method avoids the accuracy of the visual method and the use of the sputum. The long-term measurement of the nitrogen analyzer is a drawback, but there are certain drawbacks to using the chlorophyll detector for measurement:
There is a great influence on the measured leaf position. It is proved by experiments that the measured value is larger and the deviation is the smallest at the position of 55% from the base of the leaf, and the standard deviation of the measurement results is compared in the range of 40% to 80%. small. There are two reasons for this phenomenon, first determined by the appearance of the corn leaves. The middle part of the corn leaves is directly exposed to sunlight, so the chlorophyll and nitrogen-containing enzymes are high here.
In the process of measurement, if the measurement result is to meet the specified test accuracy, the number of measurements will be much more, at least 20 times or more, so that the measurement time is long and there will be a certain error. . So how to avoid the above problems?
The above problems occur when the content of nitrogen is determined by measuring the chlorophyll using a hand-held chlorophyll meter, and can be performed in a comparative manner. The specific approach is to set up a control zone in the field where the nitrogen supply is in a state of luxury absorption for the crop. The nitrogen requirement of the crop is determined by comparing the chlorophyll meter readings of the crops in the field and the control area, so as to avoid the influence of some factors. This reduces the error by comparing the two sides, and also reduces the waste of measurement time.
It is feasible to use the chlorophyll meter to judge the nitrogen deficiency of plants. It is verified by experiments that the application rate of nitrogen fertilizer can be reduced by 10% without reducing crop yield.
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