Proceedings Article10.1117/12.582987
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 +5 more
- 20 Jan 2005
- Vol. 5655, pp 522-530
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TL;DR: In this paper, the relationship between vegetation index (OSAVI) and nitrogen content was used to determine the amount of nitrogen fertilizer recommended for variable rate management in precision agriculture. But, it didn't increase crop yield and grain protein content significantly and did not decrease the variety of 1000grain weight, compared to traditional rate application.
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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.
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Citations
Precision nitrogen management of wheat. A review
TL;DR: In this article, the authors present an investigation both on approaches and results of site-specific N management of wheat and to analyse performance and sustainability of this agricultural practice, and the major conclusions are: (a) before making N management decisions, both the measurement and understanding of soil spatial variability and wheat N status are needed.
Precision Agriculture Technology for Crop Farming
Qin Zhang
- 21 Oct 2015
TL;DR: In this article, a history of the development of precision agriculture technology is reviewed and a background on the various processes and applications is provided, and an overview of current and future considerations are discussed, and a new concept based on the control system theory is presented for more effective precision crop production.
Profitability and downside risk implications of site-specific nitrogen management with respect to wheat grain quality
TL;DR: In this paper, a virtual field was modelled with two subfields representing two distinctive yield zones to investigate how consideration of grain quality affects the economic potential of site-specific N management under temporally varying N mineralization and changing price patterns.
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Advances of Research and Application in Remote Sensing for Agriculture
Zhao Chunjiang
TL;DR: This paper reviews remote sensing applications in agriculture, summarizing advancements in radiation transmission, crop parameter retrieval, crop classification, nutrient sensing, yield prediction, and monitoring systems, highlighting future research directions for agricultural remote sensing technology.
The delineation of agricultural management zones with high resolution remotely sensed data
Xiaoyu J. Song,Xiaoyu J. Song,Jihua Wang,Wenjiang Huang,Liangyun Liu,Guangjian Yan,Ruiliang Pu +6 more
TL;DR: In this paper, the authors developed and compared different methods of delineating management zones (MZs) in a field of winter wheat using Remote Sensing (RS) techniques.
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TL;DR: The response of plant photosynthetic capacity to leaf nitrogen status is extremely rapid and the role of nitrogen in regulating photosynthesis seems to hold for a large number of species, so it appears possible to introduce nitrogen regulation on leaf photosynthesis, thus allowing better simulations of plant growth under nitrogen limiting conditions.
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Plant tissue tests for predicting nitrogen fertilizer requirements of winter wheat
TL;DR: The authors evaluated trois experiments on azotee supplementaire du ble d'hiver in Pennsylvanie, and evaluated the effect of the concentration en nitrate de la tige, the concentration in azote-Kjeldahl de la plante entiere, and le prelevement d'azote par la culture.
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Canopy nitrogen distribution and the photosynthetic performance of sunflower crops during grain filling - a quantitative analysis.
TL;DR: It is shown that leaf nitrogen content is an appropriate basis for comparison of canopy nitrogen profiles in sunflower and relatively large changes inSLN in the small leaves at the top of canopies have little effect on Pc.
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Cultivar variation in nitrogen uptake and distribution in wheat
TL;DR: Cultivar differences in nitrogen yield per unit area were identified at both heading and maturity, the ranking at both periods being similar.
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Nitrogen uptake, water use, grain yield and protein content in wheat
D.M. Whitfield,Caleb Smith +1 more
TL;DR: In this paper, the effects of nitrogen application and water supply on yield and protein content (PC) in the semi-dwarf cultivar, "Condor" were investigated in 1984, 1985 and 1987.
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