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本文应用３因子５水平的回归最优设计，研究了柳江县水稻施肥方案并建立了相应的方程。利用方程预测了最佳施肥量和产量，经统计，实际产量与预报产量的符合度为１．０５。２年推广３７万亩，增产稻谷１９３６万千克。
In this paper, the optimal design of 3 factors and 5 levels regression was used to study the fertilization scheme of rice in Liujiang County and to establish the corresponding equations. Using equation to predict the best fertilization and yield, the statistics, the actual yield and forecast yield compliance of 1.05. 2 years to promote 37 acres, an increase of 19.36 million kilograms of paddy.