利用正交趋势分析进行大面积经济施肥建模

以田间肥料效应试验为基础，利用正交趋势分析建立了大面积经济施肥的数学模型，分析了建模的理论与方法，讨论了模型的特点。该模型反映了作物产量、需肥量和土壤供肥量三者之间的关系。通过测试土壤供肥量来确定肥料效应方程，从而计算经济合理施肥量。水稻大面积施肥试验证明了该施肥模型有较高的准确性和敏感性。

USING ORTHOGONAL TREND ANALYSIS TO DEVELOP THE LARGE AREA ECONOMIC FERTILIZATION MODELS

The mathematical models of large area economic fertilization based on fertilizer yield response experiments were developed, by using orthogonal trend analysis. The theory and the method to develop the models were analysed and the properties of the fertilization models were discussed. The relationships among fertilizer requirements, crop yields and soil nutrient supplying amounts were established in the fertilization models. The economic rational fertilizer requirements can be estimated by the predition of yield response functions determined through testing soil nutrient supplying amounts. The models were proved by large area fertilizer field experiments for rice to have a good accuracy and sensitivity.