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农作物病虫的预测预报,由对比分析法作定性预报,逐步过渡到用数理统计方法作定量预报,已在生产上发挥着越来越大的作用。近来我们摸索出一种“阶差和比法”,并作了小地老虎、大豆造桥虫、一代粘虫、棉铃虫发生期和发生量的预测式,预报(回报)结果和最小二乘法(单、多元回归)几乎完全一样,而使用此法对数据处理、运算比最小二乘法大大简化了手续,易于掌握运用。
Prediction of crop pests and diseases, made by the comparative analysis of qualitative forecast, and gradually transition to mathematical statistics for quantitative forecast, has played an increasing role in production. Recently, we have explored a “step difference and the ratio of law” and made the predictive, forecast (return) results and the least squares method of the occurrence and occurrence of small tiger, soybean bridge worm, armyworm, armyworm, (Single, multiple regression) is almost exactly the same, and use this method of data processing, computing than the least squares method greatly simplifies procedures, easy to grasp the use.