Thickness compensation chlorophyll meter

Abstract

The invention discloses a thickness compensation chlorophyll meter. The conventional instrument is low in accuracy, high in price and unsuitable for field operation or cannot directly measure the content of nitrogen in a plant. Each of a singlechip and an analog-to-digital (AD) module is connected with a signal receiving and conditioning module, a thickness acquisition and conditioning module, a liquid crystal display module, a MAX3232 communication module and a keyboard input module; a power supply module supplies power to a light path control module and the thickness acquisition and conditioning module; a light signal is transmitted to a leaf to be measured by the light path control module and input into the signal receiving and conditioning module; the chlorophyll relative content (SPAD) value of the leaf is measured by the signal receiving and conditioning module; the thickness acquisition and conditioning module measures a thickness parameter; an output signal of the thickness acquisition and conditioning module and an output signal of the signal receiving and conditioning module are input into the singlechip and the AD module and processed by the singlechip, and a measuring result is output; and the singlechip can communicate with a personal computer (PC) through the MAX3232 communication module. The corrected SPAD value of the plant leaf is measured by the chlorophyll meter, the influence of leaf thickness on the measuring result is eliminated to a certain extent, and the accuracy is higher.

Description

technical field [0001] The invention belongs to the technical field of measurement and measurement, and relates to a thickness compensation type chlorophyll meter. Background technique [0002] Nitrogen fertilizer is the most widely used chemical fertilizer in the world, and it is also the most difficult to quantify accurately in the recommended fertilization. Tracing it to its cause is mainly due to the lack of testing methods that can accurately, rapidly and economically judge the nitrogen nutrition status of crops and determine the nitrogen fertilizer requirement. my country is a large agricultural country, and the amount of nitrogen fertilizer is among the highest in the world. The annual national fertilizer consumption is 1.5-2 billion tons, of which nitrogen fertilizer consumption reaches 50 million tons. According to the average price in 2010, 2,000 yuan / ton, the annual national nitrogen fertilizer purchase cost will reach 10 billion yuan. However, the unscientific ...

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Problems solved by technology

At present, chlorophyll meters at home and abroad still have limitations, especially when the thickness of leaves changes, it will affect the measurement results of plant chlorophyll content

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