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１９９６～１９９９年连续４年在湖北省秭归县进行了脐橙钾肥施用量田间试验。结果表明，尽管各处理脐橙产量年度变化很大，但施钾显著提高产量和经济效益，１９９７～１９９９年施钾平均增产２６．３％～４１．８％，施钾（Ｋ２Ｏ）１２５、２５０、３７５ｋｇ／ｈｍ２年均增加纯利 １０１１０、１５８４０、９９７０元／ｈｍ２，产投比分别为 １９．３８、１５．４０和７．０４；在试验条件下施钾（Ｋ２Ｏ）２５０ｋｇ／ｈｍ２增产效果最好；施钾有提高脐橙外观品质和内在品质的趋势，例如施钾提高或保持单果重、增加果皮厚度、提高维生素Ｃ含量等；但施钾对品质的影响年度间差异较大，尚需进一步研究。
In 1996 to 1999 for 4 consecutive years in Zigui County, Hubei Province conducted a navel orange potassium fertilizer field trials. The results showed that although the yield of navel orange varied greatly from year to year, the yield and economic benefits were significantly increased by applying potassium fertilizer. The yield of potassium was increased by 26.3% -41.8% on average from 1997 to 1999, while that of K2O 125 and 250, The average annual increase of 375kg / hm2 was 10110,15840,9970yuan / hm2, and the production / investment ratios were 19.38, 15.40 and 7.04 respectively. The yield of 250kg / hm2 K2O was the best under the experimental conditions. Potassium application could improve the appearance quality and internal quality of navel orange. For example, potassium application should increase or maintain fruit weight, increase pericarp thickness and increase vitamin C content. However, the impact of potassium application on quality is quite different from year to year, and further study is needed.