Relationship between growth and uptake dynamics in sugarcane
1995
Chabalier, P.F. (CIRAD/IRAT-97487 Saint-Denis Cedex, Reunion)
Correlative relationship between growth, expressed as an increase in dry matter (DM) or volumetric index (a non-destructive growth indicator), and the uptake of mineral elements. (notably N, P and K) was studied in a three level nitrogen fertilization experiment. The element dilution curves from the leaves and stalk differ by the element, and vary depening on the N treatment. When the level of nitrogen nutrition required for growth is provided, there is a dilution described by the relationship: N percent = DM*[-b), where the dilution coefficient (b) is close (b = 0.33) to corresponding values published for other crops. The generality of this relationship for optimal nutrient content could enable one to formulate real level diagnosis for nitrogen nutrition of a cane field independent of environmental conditions and of the age of the cane. These relationships could equably be used in already developed growth models such as EPIC-AUSCANE.
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