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土壤施Ｋ和叶面喷施Ｋ肥表明，施Ｋ肥可以促进黑穗醋栗营养生长，增加百叶干重、百果重和产量，并且促进果实成熟，提高果实可溶性固形物含量。综合分析认为，黑穗醋栗适宜的Ｋ肥施用量为，土壤施Ｋ每株为０．１５～０．３ｋｇＫ２ＳＯ４，叶面喷施Ｋ２ＳＯ４的浓度为０．５％～１％，土壤施Ｋ适宜的时期为萌芽前。
K fertilization on soil and foliar application of K fertilizer indicated that application of K fertilizer could promote the vegetative growth of black currant, increase dry weight of leaves, fruit weight and yield, promote fruit ripening and increase soluble solid content of fruit. According to the comprehensive analysis, the suitable K application rate for black currant was 0.15 ~ 0.3kgK2SO4 per plant and 0.5% ~ 1% foliar spraying K2SO4, The period before budding.