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讨论了早稻“湘早籼19号”在孕穗期淹涝胁迫下，氮肥、钾肥和栽培密度三因素三水平正交试验（采用正交试验表L9（34）设计，三分之一实施）的不同处理间产量差异。方差分析表明：氮肥和钾肥主效具有显著性差异，栽培密度主效差异不显著；在每667m2施纯氮9kg、纯钾8kg和栽培密度16.5cmｘ20cm的条件下产量水平最高。
The effects of nitrogen and potassium fertilizer and planting density on the three factors and three levels of orthogonal experiment (using orthogonal test table L9 (34) design and one third of the experiment) of Hunan early indica rice variety No. 19 at the booting stage were discussed. Yield differences between different treatments. Analysis of variance showed that the main effects of nitrogen and potassium fertilizers had significant difference, but no significant difference in the main planting density. The yield was the highest under the condition of 9kg of pure nitrogen per 667m2, 8kg of pure potassium and 16.5cmx20cm of planting density.