M-DRIS Application in Diagnosis of N,P,K Nutrient Balance of Potato Seedlings

Through the sand culture pot experiment,using complete solution as the control,modified diagnosis and recommendation integrated system( M-DRIS) was used to diagnose the N,P,K sufficiency in different parts of N deficiency potato. The results showed that nitrogen deficiency would inhibit the growth of potato. The nutrient content of N was lower than CK( complete solution) while the nutrient content of P,K were higher. Nutrient imbalance index( NII) : aerial stem leaf the petiole leaf blades tuber underground portion. The nutrient content of aerial stem was the most imbalanced part,while underground portion nutrient content was in a proper range. The order of nutrient requirements by potato seedlings was N K P under the condition of N deficiency.