Full text: Remote sensing for resources development and environmental management (Volume 1)

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Symposium on Remote Sensing for Resources Development and Environmental Management / Enschede / August 1986 
Study on the spectral radiometric characteristics and the 
spectrum yield model of spring wheat in the field of BeiAn city, 
HeilonJiang province, China (primary report) 
Ma-Yanyou, You-Bochung, Guo-Ruikuan, Lin-Weigang & Mo-Hong 
Harbin Remote Sensing Sub-centre of Heilongjiang Academy of Agricultural Sciences, China 
ABSTRACT: Through the measurements and analysis of the growing condition and the yield of grain in 24 sample- 
sites located in the field of BeiAn city with the spectral radiometers (WFD9), we have got the result that 
Spring Wheat possesses most distinguishing features of reflective spectrum like those of other green plants, 
but it has its own special feature. The curves of spring wheat reflection usually change with its different 
growing stage and has certain rule of change. The reflective data of the radio between the band 5 and band 7 
(MSS) seems to be closely related with the yield by using the method of regression. The results reinforce the 
potential to us that we can forecast the yield of spring wheat before the harvest with measurements of radio 
meter . 
1. METHODS AND MATERIALS 
The field experiment was located on the Black earth 
in BeiAn city (47 40’-48 40’N, 126-127 50’ E) Heilon 
Jiang Province. According to the historical yield of 
BeiAn city, the field was divided into two levels of 
yield: the high yield and the mid yield. 
A Model "WFD9" radiometer with 16 field of view was 
used to measure radiances corresponding to the Land- 
sat MSS band 4, 5, 6, and 7, representing 0.5-0.6, 
0.6-0.7, 0.7-0.8 and 0.8-1.1 um wavelenth, respec 
tively. The reflectances were measured with two 
radiometers (WFD9) on clear days throughout the 
growing season of spring wheat. Readings were obtained 
on 15 days during the growing season. 
Our original intent was to use the reflectances 
of spring wheat to establish the spectrumyieId 
model and attempted to estimate the yield of spring 
wheat with the measurement of spectral radiometer. 
2. RESULTS AND DISCUSSION 
In table 1, there is no difference in the reflectance 
tendency of different crops, but in the band 6 or 7, 
the differnces of reflectances are notable, it approa 
ched from 13.2% to 41%. see fig.l. 
In table 2, the difference of reflectance of the 
variant growing stage of spring wheat also possesses 
the same rule. The value of difference in the band 7 
approached 7.86% to 19.31% 
On figure 2 and 3, we have found the reflectance can 
be used to moniter the growing strenth of spring 
wheat. The reflectance of plants growing well is 
higher than that of plants growing badly. The 
difference in band 7 is very significant. The absorp 
tion of sunshine is lesser and its reflection is 
greater because the chlorophyll content of plants is 
lesser at seedling and nodal stage. The absorption 
and reflection of sunshine are stronger and weaker, 
respectively, because the chlorophyll content of 
plants is higher from hesding stage to milky matu 
rity stage. 
The reflective data of the ratio between the band 
5 and band 7 seem to be closely related with the 
yield by using the method of regression. We have 
obtained the primary spectrumyield modal of spring 
wheat as follows: 
Y= -567.27 + 974 X (high yield spectrumyield model) 
R = 0.87 
Y= -907.3 + 2485 X (mid yield spectrumyield model) 
R = 0.93 
(note: X = log IR/R) 
Figure 2. The spectral curves of spring wheat 
growing well and badly in heading stage.
	        
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