The field experiment was tested to investigate the relationship between chlorophyll content in leaves of flue-cured tobacco and the value measured by SPAD-502 chlorophyll meter to discuss the application prospect of SPAD-502 chlorophyll meter in tobacco production.

Application of chlorophyll meter SPAD-502 in diagnosis of nitrogen status and nitrogenous fertilizer in rice;

Field experiment was conducted to study the effect of 17-year long-term mixed application of organic-inorganic fertilizations on chlorophyll SPAD value of the flag leaves,the top 2nd leaves and the top 3rd leaves of early rice in early-tilling,peak-tilling,full-heading,milk ripe,waxy-ripening and ripening stage.