Abstract:

The most widely used methods to assess Whangkeumbae leaf nutrients status diagnosis and fertilization recommendation needs a lot of the laboratory for analysis. Due to their labor requirements or high costs these methods can hardly be applied. This study examined an alternative method to research the possibility of measuring leaf nutrients status diagnosis by using a digital camera to record the visible light reflected from Whangkeumbae. The results showed that greenness intensity had positive correlation with the total N concentration; the correlation coefficient values were from -0.703 to 0.923 for K; redness intensity, greenness intensity and blueness intensity had significant or very significant negative relationships with magnesium contents. Redness intensity and greenness intensity had a significant positive correlation with SPAD reading. Normalized redness intensity showed prominently and very prominently inverse relationships with K and Zn; normalized greenness intensity did prominently positive mutuality; the correlation coefficient were 0.819**and -0.753* between normalized blueness intensity and K and Fe, respectively. The new method will have bright future in the sustainable development of pome industry.