Kr. Mankin et Rp. Fynn, MODELING INDIVIDUAL NUTRIENT-UPTAKE BY PLANTS - RELATING DEMAND TO MICROCLIMATE, Agricultural systems, 50(1), 1996, pp. 101-114
This paper proposes an approach for modeling plant uptake of individua
l nutrients based on incident microclimatic variables and independent
of water uptake. Current nutrient uptake models, though quite complex,
have not been developed in a form directly applicable to nutrient man
agement systems for greenhouse crop production. This paper proposes an
approach for predicting plant nutrient use based on the assumption th
at plant nutrient demand, as determined by photosynthetic rate, determ
ines the required rate of nutrient uptake for optimal growth. This gen
eral model allows specific models to be developed with direct function
al relationships between individual nutrient uptake rates and incident
microclimatic variables. A simple model is presented which applies nu
trient demand directly to photosynthetic photon flux density.