数字图像技术在夏玉米氮素营养诊断中的应用  

Diagnosis of N nutrient status of corn using digital image processing technique

作　　者：张立周[1,2] 王殿武[1] 张玉铭[2] 程一松[2] 李红军[2] 胡春胜[2] 

机构地区：[1]河北农业大学资源与环境科学学院,保定071000 [2]中国科学院遗传与发育生物学研究所农业资源研究中心,石家庄050021

出　　处：《中国生态农业学报》2010年第6期1340-1344,共5页Chinese Journal of Eco-Agriculture

基　　金：中国科学院知识创新工程重大项目(KSCX-YW-09);国家科技支撑计划项目(2008BADA4B02)资助

摘　　要：基于6个不同水平的氮肥田间试验,采用数码相机获取夏玉米6叶期和10叶期的冠层图像,分析了不同供氮水平下夏玉米冠层图像色彩参数指标与施氮量、叶片SPAD值、植株硝酸盐浓度、植株全氮含量、0～90cm土壤硝态氮含量之间的关系。结果表明:在6叶期,玉米冠层数字图像色彩参数指标B/(R+G+B)、G/B、R/B、B/L均与施氮量、叶片SPAD值、植株硝酸盐浓度、植株全氮含量、0～90cm土壤硝态氮含量存在极显著的线性相关关系,其中B/(R+G+B)与各营养参数的相关关系最好,其次是B/L。因此,运用数字图像技术进行玉米的氮素营养诊断是可行的。夏玉米6叶期冠层图像色彩参数指标与上述营养参数间的相关性明显高于10叶期,可作为应用数字图像技术进行氮素营养诊断的关键时期,而蓝光标准化值[B/(R+G+B)]是进行夏玉米氮素营养诊断的最佳冠层图像色彩参数指标。Canopy images of summer corn were taken in the 6-leaf and 10-leaf stages in a field experiment with six N application levels. And the relationships between color parameter indexes of corn canopy images and N application level, leaf SPAD, stem sap nitrate concentration, plant total N content and nitrate N content in 0～90 cm soil were determined. The results show that in the 6-leaf stage, color parameter indexes of B/（R＋G＋B）, G/B, R/B, B/L are significantly linearly correlated with N application level, leaf SPAD, stem sap nitrate concentration, plant total N content and nitrate N content in 0～90 cm soil （P0.01）. And B/（R＋G＋B） presents most significant correlation, and B/L is next to it. In 10-leaf stage, the correlations are not so significant as those in 6-leaf stage. The results suggest that it is feasible to use digital image processing technique to diagnose N nutrient statues of summer corn. The 6-leaf stage is crucial period with B/（R＋G＋B） as the index for the N nitrogen diagnosis using digital image processing technique.

关 键 词：夏玉米 冠层图像 色彩参数 数字图像技术 氮素营养诊断 

分 类 号：S126[农业科学—农业基础科学] S513