Journal ArticleDOI
Will Variable-Rate Nitrogen Fertilization Using Corn Canopy Reflectance Sensing Deliver Environmental Benefits?
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This article is published in Agronomy Journal.The article was published on 2010-01-01. It has received 44 citations till now. The article focuses on the topics: Canopy.read more
Citations
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Journal ArticleDOI
What good are unmanned aircraft systems for agricultural remote sensing and precision agriculture
TL;DR: In this paper, remote sensing from unmanned aircraft systems (UAS) was expected to be an important new technology to assist farmers with precision agriculture, especially crop nutrient management, and there a...
Journal ArticleDOI
Sensor-Based Nitrogen Applications Out-Performed Producer-Chosen Rates for Corn in On-Farm Demonstrations
Peter C. Scharf,D. Kent Shannon,H. L. Palm,Kenneth A. Sudduth,Scott T. Drummond,Newell R. Kitchen,Larry J. Mueller,Victoria C. Hubbard,Luciane F. Oliveira +8 more
TL;DR: In this article, Scharf et al. used spectral measurements of crops to diagnose and control N fertilizer rates at a fine spatial scale, and found that variability in crop yield and demand for N is usually not a major factor determining the EONR.
Journal ArticleDOI
Agriculture: sustainable crop and animal production to help mitigate nitrous oxide emissions
TL;DR: In this paper, a range of technologies are available to reduce emissions, but rather than focusing specifically on emissions, the broader management and policy focus should be on improved N use efficiency and effectiveness; for lower N 2 O emissions per unit of crop and animal product, or per unit in land area.
Journal ArticleDOI
Do crop sensors promote improved nitrogen management in grain crops
André Freitas Colaço,Rob Bramley +1 more
TL;DR: In this article, a review of sensor-based application research to explore the outcomes from this technology and provide guidelines for future developments in its application is presented, with the focus on the economic benefits.
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Enhanced nitrogen fertiliser technologies support the ‘4R’ concept to optimise crop production and minimise environmental losses
TL;DR: In this article, an enhanced-efficiency N fertiliser (EEF) is proposed to reduce nitrogen losses via volatilisation, leaching, drainage, run-off and denitrification.
References
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Journal ArticleDOI
Changes in Mississippi River Water Quality this CenturyImplications for coastal food webs
R.E. Turner,N.N. Rabalais +1 more
TL;DR: Water quality in streams, rivers, lakes, and coastal waters may change when watersheds are modified by alterations in vegetation, sediment balance, or fertilizer use after industrialization or the conversion of forests and grasslands to farms and cities as mentioned in this paper.
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Nitrate contamination of groundwater in North America
J.F. Power,James S. Schepers +1 more
TL;DR: In this article, the problem of controlling nitrate pollution of groundwater in North America is discussed, and best management practices (irrigation scheduling; fertilization based on calibrated soil tests; conservation tillage; acceptable cropping practices; recommended manuring rates) have been demonstrated to be highly effective in controlling leaching of nitrates.
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Responsive in-season nitrogen management for cereals
TL;DR: In this paper, the authors review the major managerial causes for low NUE, including (1) poor synchrony between fertilizer N and crop demand, (2) uniform field applications to spatially variable landscapes that commonly vary in crop N need, and (3) failure to account for temporally variable influences on crop N needs.
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Evaluating the profitability of site-specific farming
TL;DR: In this paper, the authors evaluate the profitability of site-specific farming practices by synthesizing quantitative and qualitative research results within the context of the economics of information technology and find that VR fertilizer application is unprofitable on wheat (Triticum aestivum L.) and barley (Hordeum vulgare L.), sometimes profitable on corn (Zea mays L.), and profitable on sugarbeet (Beta vulgaris subsp. L. vulgaris).
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Field-scale variability in optimal nitrogen fertilizer rate for corn
Peter C. Scharf,Newell R. Kitchen,Kenneth A. Sudduth,J. Glenn Davis,Victoria C. Hubbard,John A. Lory +5 more
TL;DR: In this paper, the authors characterize the spatial variability of corn (Zea mays L.) N need in production corn fields and demonstrate that applying only as much N fertilizer as is needed by a crop has economic and environmental benefits.