Kpai Patrick Yawo, Adaramola Oluwafemi, Addo Philip Wiredu, MacPherson Sarah, Lefsrud Mark
Department of Bioresource Engineering, McGill University, Montreal, QC, Canada.
Front Plant Sci. 2024 Dec 3;15:1501484. doi: 10.3389/fpls.2024.1501484. eCollection 2024.
Cannabis cultivated for medical and adult use is a high-value horticultural crop in North America; however, we lack information on its optimal mineral nutrition due to previous legal restrictions. This study evaluated the mineral requirements of nitrogen (N), phosphorus (P), and potassium (K) for cannabis in the vegetative stage using response surface analysis. Plants were cultivated in a hydroponic system with various nutrient solution treatments (mg L) of N (132.7, 160, 200, 240, and 267.3), P (9.6, 30, 60, 90, and 110.5), and K (20.8, 60, 117.5, 175, and 214.2) according to a central composite design. Nutrient interactions (N × K, K × P, and N × P × K) had a significant effect on the vegetative growth of the cannabis plants. N × K interaction had a significant effect on leaf mass and stem mass. K × P interaction had a significant effect on dry root mass, leaf mass, stem mass, leaf area, specific leaf area, and chlorophyll a and b contents. N × P × K interaction had a significant effect on root mass, leaf mass, stem mass, stem diameter, leaf area, and chlorophyll a and b contents. The optimum concentrations of total nitrogen, P, K, calcium, and sulfur in the cannabis leaves were 0.54, 0.073, 0.27, 0.56, and 0.38 mg g, respectively. An increase in P and K concentrations decreased the magnesium concentration in the leaves, but it was unaffected by the increase in N concentration. The recommended primary macronutrients for cannabis plants in the vegetative stage based on the maximum desirability and nutrient use efficiencies were 160-200 mg L N, 30 mg L P, and 60 mg L K. These findings can offer valuable insight and guidance to growers regarding the mineral requirements for cannabis during the vegetative stage.
用于医疗和成人用途的大麻在北美是一种高价值的园艺作物；然而，由于先前的法律限制，我们缺乏关于其最佳矿物质营养的信息。本研究使用响应面分析评估了大麻营养生长阶段对氮（N）、磷（P）和钾（K）的矿物质需求。根据中心复合设计，将植物种植在水培系统中，采用不同的营养液处理（mg/L），其中N（132.7、160、200、240和267.3）、P（9.6、30、60、90和110.5）、K（20.8、60、117.5、175和214.2）。营养相互作用（N×K、K×P和N×P×K）对大麻植株的营养生长有显著影响。N×K相互作用对叶质量和茎质量有显著影响。K×P相互作用对干根质量、叶质量、茎质量、叶面积、比叶面积以及叶绿素a和b含量有显著影响。N×P×K相互作用对根质量、叶质量、茎质量、茎直径、叶面积以及叶绿素a和b含量有显著影响。大麻叶片中总氮、P、K、钙和硫的最佳浓度分别为0.54、0.073、0.27、0.56和0.38 mg/g。P和K浓度的增加会降低叶片中的镁浓度，但不受N浓度增加的影响。基于最大合意度和养分利用效率，大麻植株营养生长阶段推荐的主要大量元素为160 - 200 mg/L N、30 mg/L P和60 mg/L K。这些发现可为种植者提供关于大麻营养生长阶段矿物质需求的有价值见解和指导。
