Coriander production under nutrient solution prepared with brackish waters and seeding densities

ABSTRACT The use of brackish water in semi-arid regions is sometimes necessary, as water is the most limiting factor for agricultural production in these regions. The present study was conducted aiming to evaluate the production of bunches of Coriandrum sativum L., cultivar Tabocas, in hydroponic system plants exposed to nutrient solutions prepared with brackish water, obtained by mixing water from a community dam (electrical conductivity of 9.93 dS m-1) with rainwater. The treatments consisted of four values of electrical conductivity of the nutrient solution (1.49, 3.14, 4.87, and 6.44 dS m-1) and three seeding densities (1.0, 1.5, and 2.0 g of seeds per cell), arranged in a completely randomized experimental design in a 4 × 3 factorial scheme, with three replicates. Plant height was not affected up to the electrical conductivity of the nutrient solution of 6.44 dS m-1 with increasing seeding density. The electrical conductivity of the nutrient solution up to 6.44 dS m-1 at the seeding density of 2.0 g of seed per cell did not affect the shoot fresh and dry mass of the hydroponic coriander, mitigating the deleterious effect of salinity on water use efficiency.

**摘要** 半干旱地区的水资源是制约农业生产的最关键限制因子，因此半咸水（brackish water）的利用在此类区域有时具有必要性。本研究以水培系统（hydroponic system）栽培的芫荽（Coriandrum sativum L.）品种塔博卡（Tabocas）为材料，旨在评估其束状产量，所用营养液（nutrient solution）由某社区水塘的原水（电导率为9.93 dS m⁻¹）与雨水混合配制而成的半咸水制备。试验设置4个营养液电导率（electrical conductivity）梯度（1.49、3.14、4.87及6.44 dS m⁻¹）与3个播种密度（seeding density）梯度（每穴1.0、1.5、2.0 g种子），采用4×3析因设计的完全随机试验方案，设置3次重复（replicates）。结果表明：随播种密度提升，当营养液电导率不超过6.44 dS m⁻¹时，芫荽株高未受到显著影响；当播种密度为每穴2.0 g种子时，营养液电导率最高至6.44 dS m⁻¹也未对水培芫荽的地上部鲜重与干重造成负面影响，且缓解了盐胁迫对水分利用效率（water use efficiency）的有害效应。