Nondestructive rapid determining and controlling method for nitrogen nutrition of tea plant

Abstract

The invention discloses a nondestructive rapid determining and controlling method for nitrogen nutrition of tea plant, belonging to the technical field of tea planting, characterized by comprising: (1) determining the SPAD critical value; (2) determining the SPAD value of target tea garden; (3) comparing the obtained SPAD value of target tea garden with the critical value in the step (1) to determine the optimum nitrogen amount. In the invention, the nitrogen amount can be determined by determining the SPAD value of target tea garden, thus the method is reasonable and the operation is simple and rapid, the determining is performed on the leaves of the tea plant without the damage to the plant and the effect of the weather, the method has the practicability for the production, in particular has strong fertilizing instructiveness for the tea grower or the technician and overcomes the deficiencies in the prior art.

Description

technical field [0001] The invention belongs to the technical field of tea tree planting, and in particular relates to a non-destructive rapid measurement and control method for nitrogen nutrition of tea trees. Background technique [0002] The SPAD value is measured by the SPAD-502 chlorophyll meter, and its working principle is: both chlorophyll a and chlorophyll b have maximum absorption peaks in the red light region, but have almost no absorption in the near-infrared region. SPAD-502 uses a dual-wavelength light-emitting diode (LED) light source to emit two wavelengths of light: red light with a wavelength of 650nm and near-infrared light with a wavelength of 940nm. The light receiving system of the instrument is a silicon photodiode. When the light passes through the sample and reaches the receiver, the light signal is converted into an analog electrical signal. The electrical signal is amplified by the amplifier and then converted into a digital signal by the A / D conve...

AI Technical Summary

Problems solved by technology

[0003] At present, the chlorophyll meter has been successfully applied to rice, wheat, corn, lettuce, cotton, potato and other crops, but it has not been used in tea trees.

Moreover, the control of the amount of

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