Photo-selective nets and potassium concentrations on Costus lasius crop

ABSTRACT The practice of using different photo-selective nets, associated with the technique of fertigation, represents a new agrotechnological concept that aims to promote specific physiological responses for growth and production, which are regulated by light. The aims of the study were to evaluate the effect of photo-selective nets and potassium concentrations in the fertigation solution on the horticultural performance of Costus lasius. The study was conducted at the Universidade de São Paulo, ESALQ, Piracicaba, SP, Brazil. Three experiments were carried out separately to evaluate five potassium concentrations in the fertigation solution (40, 80, 120, 160 and 200 mg L-1) under three colours of photo-selective nets (red, blue and black) in a randomized block design, with five repetitions. The variables plant height and numbers of leaves, stems and flower buds were evaluated. The data were submitted to the joint analysis of experiments. The association between the K+ concentration of 200 mg L-1 and the black photo-selective net results in higher stem and inflorescence production.摘要 结合水肥灌溉（fertigation）技术应用不同光选择性遮阳网（photo-selective nets）的实践，代表了一种全新的农业技术理念，其核心是通过光信号调控诱导特异性生理响应，以促进作物生长与产量提升。本研究旨在探究光选择性遮阳网与水肥灌溉液钾离子浓度对绒毛闭鞘姜（Costus lasius）园艺性状表现的影响。本试验于巴西圣保罗州皮拉西卡巴市圣保罗大学ESALQ学院开展。本研究共设置3组独立试验，每组试验均采用随机区组设计（randomized block design），设置5次重复，分别探究3种光选择性遮阳网（红色、蓝色、黑色）与5种水肥灌溉液钾离子浓度（40、80、120、160、200 mg·L⁻¹）的交互效应。本试验测定的指标包括株高、叶片数、茎秆数以及花蕾数。试验数据采用多试验联合方差分析进行统计处理。结果表明，当水肥灌溉液钾离子浓度为200 mg·L⁻¹且搭配黑色光选择性遮阳网时，绒毛闭鞘姜的茎秆与花序产量更高。