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 半干旱地区水资源匮乏，为当地农业生产的最主要限制因子，因此半咸水（brackish water）的利用有时实属必要。本研究以芫荽（*Coriandrum sativum* L.）品种‘塔博卡’（Tabocas）为试材，旨在评估其在水培系统（hydroponic system）中的束状产量，试验所用营养液由电导率（electrical conductivity）为9.93 dS·m⁻¹的社区坝水与雨水混合配制而成的半咸水制备。试验设置4个营养液电导率梯度（1.49、3.14、4.87和6.44 dS·m⁻¹）与3个播种密度（每穴1.0、1.5、2.0 g种子），采用4×3完全随机析因试验设计并设置3次重复。结果表明，当营养液电导率不超过6.44 dS·m⁻¹时，播种密度增加对株高无显著影响；在每穴2.0 g种子的播种密度下，营养液电导率最高达6.44 dS·m⁻¹时，水培芫荽的地上部鲜重与干重均未受显著影响，且可缓解盐分胁迫对水分利用效率的有害效应。