Abstract: Vertical and lateral field fertilizing experiments were conducted to investigate the best potassium (K) fertilizer consumption and application of pepper in polytunnel greenhouse. The results indicated that the different application of potassium had significant effects on plant height, plant width, stem diameter, fruit length, fruit width and fruit weight with the N fertilizer 15.0 kg·667m-2 and P fertilizer 3.5 kg·667m-2. The relationship between pepper yields (y) and potassium(x) was y= -2.2743x2 + 53.402x + 802.45 (r2 = 0.973). The best optimum amount of potassium fertilizer was 11.74 kg·667m-2. Under the same background of N, P fertilizer, with the potassium fertilizer of 12.0 kg·667m-2, the different proportion of base fertilizer and topdressing of potassium had different effects on plant height, plant width, stem diameter, fruit length, fruit width and fruit weight. The proportion of base fertilizer and topdressing was 2∶8, the production index were higher than other treatments significantly.

Key words: pepper, potassium fertilizer, optimum amount of fertilization, fertilizer operations

摘要： 以台湾‘长香’辣椒Capsicum frutescens品种为材料，通过设置钾肥横向与纵向施肥的田间试验，探讨辣椒最佳钾肥用量及其运筹。结果表明，在设定氮、磷肥施用量分别为15.0、3.5 kg·667m-2的条件下，钾肥不同施用量对辣椒的株高、幅宽、茎粗的长势及果长、果粗、单果重等品质均有明显的影响，辣椒产量(y)与钾肥施用量(x)两者呈y = -2.2743x2 + 53.402x + 802.45的相关性(r2 = 0.973)，钾肥最佳施用量为11.74 kg·667m-2；在同样条件下，钾肥施用量12.00 kg·667m-2，按基肥与追肥不同比例进行施用，辣椒株高、幅宽、茎粗的长势及果长、果粗、单果重等品质与产量均有所差异，其基肥∶追肥按2∶8的配比进行运筹施用，辣椒品质与产量均明显优于其他配比。

关键词: 辣椒, 钾肥, 最佳施肥量, 施肥运筹