SU1276963A1 - Method of remote determining of physiological conditions of plant - Google Patents

Abstract

This invention relates to remote laser spectroscopy techniques. It provides detection of the stress state and pathology of cotton. From a laser mounted on board the aircraft, a laser pulse is sent to the object under study (vegetation cover), which stimulates the fluorescence of plant chlorophyll, which through the receiving device enters the recording system. The results of the. bathe by the formula ((Igy5-I)). dffc-l-ns), where I (, sj is the intensity of the main maximum in the fluorescence spectrum of chlorophyll (nm), IS 115 is the fluorescence intensity of 7.30 long-wavelength chlorophyll. The p value (. corresponds to a healthy plant and vice versa oli O - its pathological condition. 3 Il.

Description

"one

The invention relates to the study and analysis of materials using optical methods and can be used to determine the physiological state of plants,

The purpose of the invention is the detection of the stress state and pathology of cotton,

FIG. 1 is a device implementing the method, FIG. 2 and 3 - intensity vs. fluorescence wavelength for healthy and infected plants,

The device contains a laser 1, generating a pulsed radiation with a power of 1-2 MW, a receiving telescope 2, assembled according to the Cassegrain scheme, a system of mirrors 3, a spectrometer 4, three photodetectors 5, a system, recordings 6, a complex of processing the results 7, intended for digitizing analog signals and data processing online.

The method is as follows.

in a way.

From laser 1 installed onboard the aircraft to the object under study (vegetation cover), a laser pulse is sent to excite the chlorophyll fluorescence of plants, which through the receiving telescope 2, spectrometer 4 and photodetectors 5 enters the systems at registration 6, from which, after amplification and digitization enters the complex of processing of results 7, which are processed by the formula where 1

- intensity

  6S5

the main peak in the fluo spectrum; -1,685 nm),

I - the intensity of the chlorophyll fluorescence

I.

long-wave forms of chlorophyll,

responsible for the functional state of plants.

The value (; L..O corresponds to a healthy plant and vice versa to its pathological condition.

For example, to determine the physiological state of cotton by the proposed method, a laser pulse with a power of 1-2 MW with a wavelength of 337 nm is sent to the surface of the cotton field. The excited chlorophyll fluorescence signals from the leaves of healthy plants have spectra shown in FIG. 2 (curves 8, 9, 10), while cotton plants infected with wiltus

volumes of the disease, a feature of the fluorescence spectrum is detected, as shown in FIG. 15. 2 (curve 11).

The symptoms of the disease in the fluorescence spectra are manifested as a decrease in the spectral relative intensity and disappearance of the characteristic arm (Fig. 3, curves 12, 13, 14, 15) in the region of 730 nm.

Thus, the proposed method makes it possible to carry out a quick and accurate assessment of the physiological state of plants on large plantations of agricultural land, regardless of weather conditions.

Claims (1)

"The invention relates to the study and analysis of materials using optical methods and can be used to determine the physiological state of plants. The purpose of the invention is to detect the stress state and pathology of cotton. FIG. 1 is a device implementing the method, FIG. 2 and 3 - intensity depending on the fluorescence wavelength for healthy and infected plants. The device contains a laser 1 generating pulsed radiation with a power of 1-2 MW, a receiving telescope 2 assembled according to the Cassegrain scheme, a system of mirrors 3, a spectrometer 4, three photodetectors 5, system, recording 6, a set of results processing 7 intended for digitizing analog signals and processing data online. The method is carried out as follows. From a laser 1 mounted on board an aircraft to a test object (vegetation cover), a laser pulse is sent to induce the fluorescence of plant chlorophyll, which through the receiving telescope 2, spectrometer 4 and photodetectors 5 enters the recording system 6, from which, after amplification The digitization enters the results processing complex 7, which is processed according to the formula 6S5 where 1 is the intensity of the main maximum in the fluo spectrum; -1685 nm), the resolution of chlorophyll I. ,,. I is the fluorescence intensity of long wavelength forms of chlorophyll responsible for the functional formation of plants. The value (; L..O corresponds to a healthy plant and vice versa to its pathological condition. For example, to determine the physiological state of cotton by the proposed method, a 1-2 MW laser pulse with a 337 nm wave is sent to the surface of the cotton field. Excited The chlorophyll fluorescence signals of healthy plant leaves have spectra shown in Fig. 2 (curves 8, 9, 10), while in cotton plants infected with wilt plants of the disease, a feature of the fluorescence spectrum is detected, as shown in Fig. 2 (curve 11). The signs of the disease in the fluorescence spectra are manifested as a decrease in the spectral relative intensity and disappearance of the characteristic arm (Fig. 3, curves 12, 13, 14, 15) in the region of 730 nm. Thus, the proposed method provides an opportunity to make a quick and accurate assessment of the physiological state of plants on large plantations of agricultural land regardless of weather conditions. Formula of the invention A method for remotely determining the physiological state of a plant by means of laser excitation Chlorophyll fluorescence of a plant and recording of intensity at biased frequencies, including a wavelength of 683 nm, characterized in that, in order to detect the stress state and pathology of cotton, fluorescence is additionally recorded at wavelengths of 715 and 730 nm and according to the ratio of intensities to intensity over length 685 nm waves determine the state of the plant. ercfrtt // jrf / t} W ffa / nMec W .5459 63 674. FS / 9.2 // V / WA rff) 7ff)