Experimental and Statistical Methods of Plant Experiments used in an Agroclimatic Investigation in Aust-Agder, Norway

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Abstract
Field and outdoor container experiments were conducted with several agricultural crops. The soil characteristics and experimental methods common to all crops are described. The meteorological recordings and their derived variables are briefly described. Estimates of the potential and the actual evapotranspiration are given. A model for the estimation of daily rates of development between observable phenological stages by use of daily records of environmental variables was worked out, allowing for curvilinea responses to the environmental factors. The model can be used for estimation of a biometeorological time scale giving daily characteristics of the developmental stage from sowing to harvesting. Using the biometeorological time scale another model for evaluation of weather effects from sowing to harvesting of the final yield was developed. This allows contributions to the final yield by different combinations of environmental variables at different stages of development to be estimated. The model may also be used for predictive purposes.