Relationship between vegetation index and number of grains on paddy rice
2005
Wakiyama, Y.(National Agricultural Research Center, Tsukuba, Ibaraki (Japan))
It was reported that optical remote sensing could estimate absorptance of solar radiation by rice communities. Both chlorophyll and nitrogen content in rice communities were also reported to be estimated by remote sensing with high correlation. The number of rice grains per m(2) is an important factor for yield prediction. A field experiment was conducted to make sure the possibility of remote sensing for estimation of the number of rice grains. Paddy rice communities were prepared by nitrogen fertilization to have a wide range of the number of grains. The relationship between vegetation index and chlorophyll content in rice communities was in high correlation. Furthermore the number of rice grains increased with chlorophyll content in rice communities. These results suggested the possibility of remote sensing for estimation of the number of rice grains. This suggestion was confirmed by the present study. The relationship between NDVI and the number of rice grains was in good correlation (r =0.88). The possibility of estimating the number of rice grains with remote sensing was verified.
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