SENSING SITE-SPECIFIC VARIABILITY IN SOIL AND PLANT PHOSPHORUS AND OTHER MINERAL NUTRIENTS BY X-RAY FLUORESCENCE SPECTROMETRY
Detection and rapid response to in-season changes of soil nutrient availability and plant needs with weather conditions and site-specific characteristics are essential to the optimal performance of an agronomic crop production system. With recent advances in material science, detector design and sensitivity, and improved sample-target-detector geometry, quantitative determinations of light elements with low energy fluorescence are becoming more feasible. The non-destructive multi-element capability of X-ray fluorescence spectrometry (XRFS) have been applied to obtain compositional data on soil and plant samples in two large-scale field studies of nutrient management and mitigation of nutrient losses to the environment. The objectives are to demonstrate the benefits of XRFS in achieving accurate and timely compositional information. Significant relationships between XRFS-phosphorus concentrations and indices of plant availability supported the role of such methodology as a real-time soil phosphorus and other mineral nutrient sensor for site-specific precision management of nutrient inputs. Thus, the technology has an essential role in increasing nutrient-use efficiency and crop productivity while reducing nutrients losses from the farm.
X-ray Fluorescence Compton effect Plant Nutrient Analysis Real-time Phosphorus Sensing Real-time Multi-Nutrient Analysis
Thanh H.Dao Yuxin Miao
United States Department of Agriculture,Agricultural Research Service,Beltsville,Maryland,USA College of Resource and Environmental Sci.,China Agricultural University,Beijing,China
国际会议
北京
英文
1-6
2009-10-14（万方平台首次上网日期，不代表论文的发表时间）