基于GreenSeeker的水稻氮素估测

为研究水稻植株氮素指标与GreenSeeker植被指数的定量关系,通过设置不同年份、不同氮肥水平的田间试验,于移栽后定期使用GreenSeeker获取冠层归一化差值植被指数(NDVI)和比值植被指数(RVI),并同步破坏性取样获取植株生物量和氮含量,分析不同品种和不同氮营养条件下氮素和植被指数(NDVI和RVI)变化规律,建立基于NDVI和RVI的氮素监测模型。结果表明,植株氮含量可以基于NDVI和RVI分时期进行估算,植株氮积累量可以被分阶段反演。利用GreenSeeker可以实现水稻氮素快速无损监测,为水稻氮肥精确管理提供技术支持。

Nitrogen nutrition estimation of rice base on GreenSeeker

This paper is concerned on the quantitative relationship between plant nitrogen content (PNC), plant nitrogen accumulation (PNA), and NDVI, RVI of GreeSeeker in rice.Three field experiments with different rice varieties and nitrogen levels were carried out during different years.The time-course measurements included NDVI, RVI and plant weights and nitrogen contents during the experimental period. The result showed that PNC could be estimated with the vegetation indice of the active sensor at each period.The PNA could be well estimated phase by phase as well.It could be concluded that nitrogen parameters in rice can be monitored directly by NDVI and RVI, which might supply with a technical support for nitrogen fertilizer management.