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The Feasibility and Benefit Evaluate of Variable Nitrogen FertilizationApplication on Winter Wheat Based on
Canopies Spectroscopy Parameters |
LIANG Hong-xia 1,2 , ZHAO Chun-jiang 1, HUANG Weng-jiang 1, MA You-hua 2, LIU Liang-yun
1, WANG Ji-hua 1, XUE Xu-zhang 1
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The Feasibility and Benefit Evaluate of Variable Nitrogen
FertilizationApplication on Winter Wheat Based on
Canopies Spectroscopy Parameters |
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Abstract Among plant nutrients, nitrogen (N) is the most important and essential for growing crops and is also most concerning nutrient element for maintaining healthy environment. In 2001, N fertilizer prices nearly doubled as a result of increased natural gas prices. This was further troubling when considering that the world N use efficiency (NUE) in cereal grain production averages only 33%.Considering these poor use efficiencies and the associated costs of improper management, technological advances are needed to reduce excess nutrient applications. From the last few years, precision agriculture has been used widely as a management tool to maximize yield and to minimize cost. The GPS and GIS technology has been a basis for precision farming and site-specific application of agricultural chemicals and nutrients has been one of the major concerns in precision farming. By applying nitrogen only where it is needed, farmers could optimize yield while minimizing the cost. The ultimate goal of this research is to develop a real-time multispectral sensor that can detect nitrogen deficiency in winter wheat plant using spectral response from plant canopies.This research was conducted to explore the feasibility of using spectral reflectance to predict nitrogen content in winter wheat plant varieties with varying color. The paper presents a statistical analysis on the feasibility of directing variable rate technology with spectrum characteristic parameters (OSAVI) of winter wheat erecting and elongation. Through analysis of OSAVI and yield, the spectrum characteristic parameters was closely correlated to the grain yield, it can be used to determine the in-season predicted grain yield. the result of variable
-rate technology revealed that variable-rate technology ameliorated the winter wheat growth condition, improved the total dry biomass and yield, decreased the variety of yield and increased the winter wheat yield significantly. but it increased the variety of grain quality among each treatments, the protein content and wet gluten were decreased slightly too.
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Received: 28 November 2004
Published: 17 November 2011
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