Institute of Environmental Science and Research Limited (ESR Ltd), Kenepuru Science Centre, 34 Kenepuru Drive, Porirua, New Zealand.
Forensic Sci Int. 2010 Oct 10;202(1-3):36-44. doi: 10.1016/j.forsciint.2010.04.022. Epub 2010 May 13.
The results of an indoor hydroponic Cannabis growth study are presented. It is intended that this work will be of assistance to those with an interest in determining an estimation of yield and value of Cannabis crops. Three cycles of six plants were grown over a period of 1 year in order to ascertain the potential yield of female flowering head material from such an operation. The cultivation methods used were selected to replicate typical indoor hydroponic Cannabis growing operations, such as are commonly encountered by the New Zealand Police. The plants were also tested to ascertain the percentage of the psychoactive chemical Δ-9 tetrahydrocannabinol (THC) present in the flowering head material, and were genetically profiled by STR analysis. Phenotypic observations are related to the data collected. The inexperience of the growers was evidenced by different problems encountered in each of the three cycles, each of which would be expected to negatively impact the yield and THC data obtained. These data are therefore considered to be conservative. The most successful cycle yielded an average of 881g (31.1oz) of dry, groomed female flowering head per plant, and over the whole study the 18 plants yielded a total of 12,360g (436.0oz), or an average of 687g (24.2oz) of dry head per plant. THC data shows significant intra-plant variation and also demonstrates inter-varietal variation. THC values for individual plants ranged from 4.3 to 25.2%. The findings of this study and a separate ESR research project illustrate that the potency of Cannabis grown in New Zealand has dramatically increased in recent years. DNA analysis distinguished distinct groups in general agreement with the phenotypic variation observed. One plant however, exhibiting a unique triallelic pattern at two of the five loci tested, while remaining phenotypically indistinguishable from three other plants within the same grow.
本文呈现了一项室内水培大麻生长研究的结果。旨在为那些有兴趣估算大麻作物产量和价值的人提供帮助。为了确定从这种操作中获得雌性开花头部材料的潜在产量,在一年的时间内进行了三批六株的种植。所使用的种植方法旨在复制典型的室内水培大麻种植操作,如新西兰警方常见的操作。还对植物进行了测试,以确定开花头部材料中存在的精神活性化学物质Δ-9 四氢大麻酚(THC)的百分比,并通过 STR 分析对其进行了基因分析。表型观察与收集的数据相关。种植者的经验不足体现在每批三个周期中遇到的不同问题,这些问题预计会对获得的产量和 THC 数据产生负面影响。因此,这些数据被认为是保守的。最成功的一批种植出了每株平均 881 克(31.1 盎司)干燥、整理好的雌性开花头部,整个研究中 18 株植物共收获了 12360 克(436.0 盎司),即每株植物平均收获 687 克(24.2 盎司)干燥头部。THC 数据显示出显著的植株内变异,也显示出品种间的变异。个别植物的 THC 值从 4.3 到 25.2%不等。这项研究和一项单独的 ESR 研究项目的结果表明,近年来,新西兰种植的大麻的效力显著增加。DNA 分析在一般意义上区分了不同的群体,与观察到的表型变异一致。然而,有一株植物在五个测试的基因座中的两个基因座上表现出独特的三等位基因模式,而在同一批种植的其他三株植物中仍然表现出表型上的不可区分。