Application Research of Non-destructive Test Technology on Tomato Nutrition Diagnosis

The number of leaves developed in different stages and SPAD readings of new leaves were tested with chlorophyll meter SPAD-502 in order to conduct non-destructive diagnosis.The results showed that the content of total nitrogen and chlorophyll in both new and matured tomato leaves correlated with the SPAD reading positively.The content of total nitrogen and chlorophyll in tomato plants increased with more input of fertilizer and so as the SPAD value.The content of VC also gradually increased and reached maximum value with the nitrogen content of 600 kg/hm~2. The solid content of tomato reached highest level with the nitrogen content of 900 kg/hm~2.Therefore,SPAD could make diagnosis on tomato nutritious status.