Research Information System
3rd Balkan Symposium on Vegetables and Potatoes, Bursa, Turkey, 6 - 10 September 2006, pp.307-309
Relationships between destructive and non-destructive nitrogen analysis were evaluated by using data obtained from cucumber and tomatoes experiments supplied with different sources and rates of nitrogen. Leaf chlorophyll was measured by using SPAD-502 chlorophyll-meter. Leaf sample was collected for N determination in the same day that chlorophyll-meter reading was recorded. Regression analysis was performed on the data to find relationship among chlorophyll meter reading value, leaf N and yield. There was a significant correlation between leaf N and chlorophyll content of tomato (r=0.470, p<0.01). Regression equation was found as y= 1.42+0.048x, where y is leaf N content, x is chlorophyll-meter reading value. In cucumber significant correlation was found between leaf N chlorophyll content only in 2001 experiment (r=0.786, p<0.001). Regression equation was found as y= -7.52+0.280x, where y is leaf N content, x is chlorophyll-meter reading value. These regression equations can be used to monitor N status of cucumber and tomatoes using chlorophyll-meter reading.