Evaluating nitrogen nutrition status of plants by application of plant tests
2001
Machul, M. (Instytut Uprawy Nawozenia i Gleboznawstwa, Pulawy (Poland). Zaklad Uprawy Roslin Pastewnych)
Nitrogen nutrition status of plants can be assessed either by direct or indirect tests. Direct tests consist in determination of total-N content in plant dry matter or N-NO3 content in green, indicator organs of the plants. Activity of nitrate reductase as well as the chlorophyll content in leaves are measured by indirect tests. Recently a fast and non-destructive chlorophyll measurements test with SPAD application is becoming more and more important
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