Method for calculating winter wheat dry matter mass increase during the growing season on the basis of climatic parameters
1996
Lakatos, L. (Debreceni Agrartud. Egyet., Debrecen (Hungary))
A dynamic model was developed to describe the total aboveground and early dry matter mass increase of the winter wheat, Yubileinaya 50. It also provides estimations of the occurrence of phenological times and yields with an accuracy of approximately (+,-) 10 days and (+,-) 0.5 t/ha, respectively. The model uses 4 variables, while the nutrient supply calculation submodel, worked out earlier, uses 3 variables. These variables are the data on air temperature (degree C) measured at 2 meters to characterize thermal conditions, data on plant-available water in a 1 m deep soil layer (mm) to represent the hydrological conditions, data on global radiation (MJ/m2) to characterize the radiation, and the nutrient supplying power of the soil, calculated with the submodel developed earlier (mg/100 g), to describe the nutrient conditions. The 3 variables of the submodel are the following: temperature at soil depth of 1 m (degree C), moisture content of a 1 m deep soil layer and precipitation, both expressed in mm. The result calculated with this model apply to the Eastern part of the Great Hungarian Plain and to any other place where the annual average variation of climatological elements are similar. The model uses a 5-day time scale. It describe the plant dry matter mass increase using the sum of the product of response function - temperature, plant - available water, solar radiation, nutrient supply - and weight functions based on probability data. As a consequence, the dual, deterministic and stochastic character of plant development is considered
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