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Calculation of the total nitrate uptake of lettuce ( Lactuca sativa L.) by use of a mathematical model to simulate nitrate inflow
Author(s) -
Steingrobe Bernd,
Schenk Manfred K.
Publication year - 1997
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.19971600113
Subject(s) - lactuca , inflow , nitrate , greenhouse , relative growth rate , environmental science , nutrient , shoot , horticulture , chemistry , mathematics , agronomy , growth rate , atmospheric sciences , meteorology , biology , physics , geometry , organic chemistry
Lettuce was grown in nutrient solution in a climate chamber under varied levels of temperature and radiation and in the greenhouse under fluctuating climatic conditions. A model to calculate maximum nitrate inflow (Imax) in relation to relative growth rate (RGR) and root:shoot ratio (RSR) was used for computing total‐N uptake. For doing this, developing of submodels to calculate RGR and RSR was necessary. The good agreement between calculated N uptake and measured total‐N taken up by the plants supports the assumption that Imax reflects the inflow necessary to meet the demand of plants.