Crispim Massuela Danilo, Hartung Jens, Munz Sebastian, Erpenbach Federico, Graeff-Hönninger Simone
Cropping Systems and Modelling, Institute of Crop Science, University of Hohenheim, 70599 Stuttgart, Germany.
Biostatistics, Institute of Crop Science, University of Hohenheim, 70599 Stuttgart, Germany.
Plants (Basel). 2022 Jan 5;11(1):140. doi: 10.3390/plants11010140.
The definition of optimum harvest and pruning interventions are important factors varying inflorescence yield and cannabinoid composition. This study investigated the impact of (i) harvest time (HT) and (ii) pruning techniques (PT) on plant biomass accumulation, CBD and CBDA-concentrations and total CBD yield of a chemotype III medical cannabis genotype under indoor cultivation. The experiment consisted of four HTs between 5 and 11 weeks of flowering and three PTs-apical cut (T); removal of side shoots (L) and control (C), not pruned plants. Results showed that inflorescence dry weight increased continuously, while the total CBD concentration did not differ significantly over time. For the studied genotype, optimum harvest time defined by highest total CBD yield was found at 9 weeks of flowering. Total CBD-concentration of inflorescences in different fractions of the plant's height was significantly higher in the top (9.9%) in comparison with mid (8.2%) and low (7.7%) fractions. The T plants produced significantly higher dry weight of inflorescences and leaves than L and C. Total CBD yield of inflorescences for PTs were significantly different among pruned groups, but do not differ from the control group. However, a trend for higher yields was observed (T > C > L).
最佳收获和修剪干预措施的定义是影响花序产量和大麻素成分的重要因素。本研究调查了（i）收获时间（HT）和（ii）修剪技术（PT）对室内种植的化学型III医用大麻基因型植物生物量积累、CBD和CBDA浓度以及总CBD产量的影响。实验包括开花5至11周期间的四个收获时间点，以及三种修剪技术——顶梢修剪（T）；去除侧枝（L）和对照（C，未修剪植株）。结果表明，花序干重持续增加，而总CBD浓度随时间变化无显著差异。对于所研究的基因型，在开花9周时发现以最高总CBD产量定义的最佳收获时间。植株不同高度部分的花序总CBD浓度，顶部（9.9%）显著高于中部（8.2%）和下部（7.7%）。T组植株产生的花序和叶片干重显著高于L组和C组。修剪组的花序总CBD产量在修剪组之间存在显著差异，但与对照组无差异。然而，观察到产量有更高的趋势（T > C > L）。
