Precision spraying device based on leaf area index of plants from fruit and tea gardens

Abstract

The invention relates to a precision spraying device based on leaf area index of plants from fruit and tea gardens. The device of the invention comprises a near infrared source, a silicon photocell, an operational amplifier circuit, a data collection card, a PC host computer, a stepping motor, a sprayer, a single-chip microcomputer, a water pump and a water tank. The near infrared source irradiates plant leaves; the silicon photocell receives light intensity passing through the plant leaves; the operational amplifier circuit collects output voltage of the silicon photocell and inputs the output voltage to the data collection card after operational amplification, and the data collection card transmits the output voltage signal to the PC host computer; the PC host computer controls the stepping motor to complete scanning of plant occupied areas, calculates the number of plant overlapped leaves according to the output voltage signal and transmits leaf area index to the single-chip microcomputer after calculation of the leaf area index; and the single-chip microcomputer outputs a control instruction to the water pump according to the leaf area index signal value, and the water pump iscontrolled to draw water until the sprayer completes the spraying operation. According to the invention, use amount of a foliar fertilizer can be reduced, fertilization efficiency is raised, and environmental pollution is reduced.

Description

technical field [0001] The invention relates to an agricultural fertilization control technology, in particular to a precise spraying device based on the leaf area index of trees, fruits and tea gardens. Background technique [0002] my country is a large agricultural production country, and the fruit tea garden is rich in resources. Spray fertilization is an important link in the management of the fruit tea garden. Plants grown in forest fruit tea gardens can be promoted by spraying foliar fertilizers. The amount of foliar fertilizer sprayed can be determined according to the growth of the plants. Leaf area index is an important reference index to reflect the growth status of plants, and its definition is the ratio of the total area of ​​all leaves of a plant per unit area to the area occupied by plants. The exponential relationship between the number of overlapping leaf layers and the output voltage of the photoelectric sensor can be used, the voltage signal can be colle...

AI Technical Summary

Problems solved by technology

[0003] Although there is a relatively accurate and mature calculation method of leaf area index, the spraying amount of foliar fertilizer does not follow the change of leaf area index in real time, so as to obtain corresponding adjustment and more precise control

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