Abstract:

Abstract Two years studies on the technique of rice nutritional diagnosis were conducted during 2006-2007 by the method of field multi-sited experiments in cold region of northeast China. The N、P、K diagnostic technique and methods were formed in both plant and soil. For the nutrient of nitrogen, the chlorophyll content of blade was the best indicator to the nutritional state in both tillering and spike formation stage. To the nutrient of phosphorus, both plant and soil total P could be used for P nutritional diagnosis in tillering stage, but plant total P was the best one to indicate the rice phosphorus status in spike formation stage. Concerning the potassium, either soil available K or plant total K could be used in the diagnosis of tillering stage, and in spike formation stage, only the soil available K was the most suitable characteristic in the practice of K diagnosis.