Yield and water use of cherry tomato under water availability and potassium doses

ABSTRACT The objective of this study was to evaluate the yield and water use of cherry tomatoes under soil water availability and potassium (K) doses in a greenhouse. The experiment was conducted in randomized blocks in a 52 fractional factorial design, corresponding to five levels of water availability and five K doses, with 13 combinations (4-0; 4-250; 4-500; 14-125; 14-375; 24-0; 24-250; 24-500; 34-125; 34-375; 44-0; 44-250; 44-500) (kPa-mg dm-3) and four replicates. A drip irrigation system with semi-automated irrigation control was used. The analyzed variables were shoot dry matter, number of fruits, yield, water consumption and water use efficiency. Highest cherry tomato yield occurs at soil water tension of 24 kPa and K dose of 290 mg dm-3. Soil water tension of 44 kPa and K dose of 290 mg dm-3 allow for higher water use efficiency in cherry tomato. Cherry tomato yield and water use are influenced by soil water availability and K doses in greenhouse.摘要 本研究旨在评估温室栽培条件下，土壤水分有效性与钾（Potassium，K）施用量对樱桃番茄产量及水分利用状况的影响。本实验采用随机区组设计结合5²部分因子方案，设置5个水分有效性水平与5个钾施用量梯度，共包含13组组合（4-0；4-250；4-500；14-125；14-375；24-0；24-250；24-500；34-125；34-375；44-0；44-250；44-500）（单位：千帕-毫克·立方分米⁻¹），并设置4次重复。实验采用配备半自动灌溉控制的滴灌系统。本研究分析的指标包括地上部干物质重量、果实数量、产量、耗水量与水分利用效率。结果显示，当土壤水势（soil water tension）为24 kPa、钾施用量为290 mg·dm⁻³时，樱桃番茄产量达到峰值；当土壤水势为44 kPa、钾施用量为290 mg·dm⁻³时，樱桃番茄可获得更高的水分利用效率。综上所述，温室栽培环境中，土壤水分有效性与钾施用量均可对樱桃番茄的产量及水分利用产生显著影响。