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For efficient agriculture production accurate measurement of soil nutrients are needed, including site-specific crop management, where nutrient application rates are adjusted on basis of requirements. Soil fertilityrefers to the ability of the soil to supply essential plant nutrients and soil water in adequate amounts and proportions for plant growth, fitness of seedbed, and impedance to seedling...
Inefficiently management of nutrient inputs has put a large limitation on the environment and human's health. Unsystematic use of nitrogen and phosphorus fertilizers has led to ground water pollution. So the farmers have to pay close attention to nutrient management and add in the concept of balanced plant nutrition into their farming techniques, including site-specific crop management (SSCM). The...
Soil nitrogen content has very important influence on soil parameters and crop productions, so the soil nitrogen monitoring and management are urgently required to satisfy the demand for precision agriculture. This research is aimed to develop the simple and low cost monitoring methods to determine the soil nitrogen pools using hyper spectral camera in Andisols soil. Partial least square regression...
Geographic informational system (GIS) and the Soil and Water Assessment Tool (SWAT) was used to simulate the transport of runoff, sediment, total nitrogen and total phosphorus into the Zhangjiafen stations. The main objective was to discuss climate change affecting on sediment and water quality. The results showed: The SWAT generally performs well and could accurately simulate monthly runoff, sediment,...
Information on canopy chemical concentrations is of great importance for the study of nutrient cycling, productivity and for input to ecosystem process models. In particular, foliar carbon to nitrogen ratio (C:N) drives terrestrial biogeochemical processes such as decomposition and mineralization, and thus strongly influences soil organic matter concentrations and turnover rates. This study evaluated...
The objective of this research was to evaluate the prediction ability of NIR to soil nutrient content. A total of 165 soil samples were obtained from the field and analyzed their spectra features. 135 samples spectra were used during the calibration and cross-validation stage, 30 samples spectra were used to predict N, P, K and OM concentration. NIR spectra and constituents were related using partial...
Rapid, non-destructive estimation of nitrogen content of crop is a potentially important application for both farm managers and researchers. This paper presents the development of a multi-spectral nitrogen deficiency sensor, which uses three channels (green, red, near-infrared) of crop images to estimate nitrogen level of the canola. The utility of a charged coupled device imaging sensor for rapidly...
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