Models for nitrogen uptake and related quality assurance in horticultural and agronomic crop production
2002
Zerche, S. | Druege, U. | Kadner, R.
Agronomic and horticultural models are developed to analyze the fundamental relationships of plant growth and to ensure anticipated growth and quality characteristics of crop products and production systems. Common modeling principles using relationships between easily measured parameters of plant biomass structure were evaluated in four different horticultural and agronomic crop production systems for estimates of on-going nitrogen demand in crops, as well as related quality control. Models for nitrogen uptake prognoses of Triticum, Dendranthema, and Pelargonium using canopy structure (shoot number, SN; shoot height, SH; number of cuttings, CN) and climate parameters (global radiation and photosynthetic active radiation) were derived specifically for production systems of Triticum cereals (SN, SH), Dendranthema cut flowers (SH) and high quality Pelargonium tip cuttings for vegetative propagation (CN). Adventitious rooting of Dendranthema tip cuttings as a cultivar-specific criterion of cutting quality predicts a model using initial nitrogen concentration of cutting tissue and shoot fresh mass of the subsequent rooted young plants. The models use a common principle based on the actual progress of plant growth as a feedback mechanism for prognoses in different crop production systems. Despite some further need in parameter calibration and validation, the universality and usability of these principles are documented.
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