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 将不同光选择性遮阳网（photo-selective nets）与水肥一体化施肥（fertigation）技术相结合的栽培模式，是一种全新的农艺技术理念，旨在通过光调控诱导特异性生理响应，促进作物生长与产量形成。本研究旨在探究光选择性遮阳网及水肥液钾离子浓度对闭鞘姜（Costus lasius）园艺表现的影响。本试验于巴西圣保罗州皮拉西卡巴市的圣保罗大学ESALQ农学院开展。本研究共开展3项独立试验，在红色、蓝色、黑色3种光选择性遮阳网条件下，设置水肥液中5个钾离子浓度梯度（40、80、120、160、200 mg·L⁻¹），试验采用随机区组设计，设置5次重复。本试验测定的性状指标包括株高、叶片数、茎秆数及花蕾数。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，当钾离子浓度为200 mg·L⁻¹并配合黑色光选择性遮阳网时，闭鞘姜的茎秆与花序产量最高。