应用叶绿素仪SPAD-502进行马铃薯氮素营养诊断的可行性

Application Feasibility of SPAD-502 in Diagnosis of Potato Nitrogen Nutrient Status

SPAD-502是用于快速测定叶绿素相对含量的一种便携式仪器,被尝试用于进行作物氮素营养诊断,其具有快速、简便、适时、无损的特点。目前在禾谷类作物上已有很多研究成果并已开始用于指导施肥实践,在马铃薯上前人也开始了一些探索性的研究。马铃薯植株叶片形态虽具有一定的特殊性,即叶片为复叶,不能照搬禾本科作物上的研究成果,但综合分析SPAD-502的特点以及禾本科作物氮素营养诊断的研究成果可以推断,通过系统研究,完全可以建立一套行之有效的马铃薯氮素营养SPAD-502诊断指标体系。在指标体系的建立过程中,需确立适合的诊断叶位并提出有效的方法消除氮素之外其他因素对SPAD读数的影响。

SPAD-502 is an instrument for quick determination of chlOrophyll content, which has been used for diagnosis of crop nitrogennutdtion status. It has the characteristics of quick, easy handle, in time and no damage. Several groups have made some primary approaches for applying SPAD in potato nitrogen management. This review summarized previous research progress and.analyzed the feasibility for applying SPAD-502 in diagnosis of potato nitrogen nutrition, The factors which influenced the accuracy of SPAD-502 nutrition diagnosis were discussed, and several possible methods improving the accuracy of diagnosis were proposed as well in this review.