Variable-rate nitrogen application algorithm based on canopy reflected spectrum and its influence on wheat

Hongxia Liang; Chunjiang Zhao; Wenjiang Huang; Liangyun Liu; Jihua Wang; Youhua Ma

doi:10.1117/12.582987

20 January 2005 Variable-rate nitrogen application algorithm based on canopy reflected spectrum and its influence on wheat

Hongxia Liang, Chunjiang Zhao, Wenjiang Huang, Liangyun Liu, Jihua Wang, Youhua Ma

Author Affiliations +

Proceedings Volume 5655, Multispectral and Hyperspectral Remote Sensing Instruments and Applications II; (2005) https://doi.org/10.1117/12.582987
Event: Fourth International Asia-Pacific Environmental Remote Sensing Symposium 2004: Remote Sensing of the Atmosphere, Ocean, Environment, and Space, 2004, Honolulu, Hawai'i, United States

Abstract

This study was to develop the time-specific and time-critical method to overcome the limitations of traditional field sampling methods for variable rate fertilization. Farmers, agricultural managers and grain processing enterprises are interested in measuring and assessing soil and crop status in order to apply adequate fertilizer quantities to crop growth. This paper focused on studying the relationship between vegetation index (OSAVI) and nitrogen content to determine the amount of nitrogen fertilizer recommended for variable rate management in precision agriculture. The traditional even rate fertilizer management was chosen as the CK. The grain yield, ear numbers, 1000-grain weight and grain protein content were measured among the CK, uniform treatments and variable rate fertilizer treatments. It indicated that variable rate fertilization reduced the variability of wheat yield, ear numbers and dry biomass, but it didn't increased crop yield and grain protein content significantly and did not decrease the variety of 1000-grain weight, compared to traditional rate application. The nitrogen fertilizer use efficiency was improved, for this purpose, the variable rate technology based on vegetation index could be used to prevent under ground water pollution and environmental deterioration.

Citation Download Citation

Hongxia Liang, Chunjiang Zhao, Wenjiang Huang, Liangyun Liu, Jihua Wang, and Youhua Ma "Variable-rate nitrogen application algorithm based on canopy reflected spectrum and its influence on wheat", Proc. SPIE 5655, Multispectral and Hyperspectral Remote Sensing Instruments and Applications II, (20 January 2005); https://doi.org/10.1117/12.582987

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