Announcements

Job offersmore »



Tweeting Growers

Top 5 - yesterday

Top 5 - last week

Top 5 - last month

Exchange ratesmore »




Research: Organic fertilizer for cannabis in two coir-based substrates

Cannabis producers, especially those with organic operations, lack reliable information on the fertilization requirements for their crops. To determine the optimal organic fertilizer rate for vegetative-stage cannabis (Cannabis sativa L.), five rates that supplied 117, 234, 351, 468, and 585 mg N/L of a liquid organic fertilizer (4.0N–1.3P–1.7K) were applied to container-grown plants with one of two coir-based organic substrates.

The trial was conducted in a walk-in growth chamber and the two substrates used were ABcann UNIMIX 1-HP with lower water-holding capacity (WHC) and ABcann UNIMIX 1 with higher WHC. No differences in growth or floral dry weight (yield) were found between the two substrates.

Pooled data from both substrates showed that the highest yield was achieved at a rate that supplied 389 mg N/L (interpolated from yield-fertilizer responses) which was 1.8 times higher than that of the lowest fertilizer rate. The concentration of ∆9-tetrahydrocannabinol (THC) in dry floral material was maximized at a rate that supplied 418 mg N/L, and no fertilizer rate effects were observed on Δ9-tetrahydrocannabidiolic acid (THCA) or cannabinol (CBN). The highest yield, cannabinoid content, and plant growth were achieved around an organic fertilizer rate that supplied 389 mg N/L during the vegetative growth stage when using the two coir-based organic substrates.

Access the full study at HortScience.

Publication date: 11/2/2017

 


 

Other news in this sector:

1/9/2018 US (MI): Managing substrate pH of soilless substrates
12/14/2017 New flat coir grow bags in four specialty blends
12/8/2017 "Growing demand for cocopeat substrates in China"
12/7/2017 Italy: "Koltura, not a simple substrate"
11/30/2017 "Three layered coir textures create perfect environment for blueberries"
11/27/2017 How substrate structure influences air porosity
11/21/2017 Peat moss comes in many grades
11/17/2017 "Stronger plant through stone wool without plant-unfriendly material"
11/17/2017 Substrates for hydroponics and aquaponics
11/13/2017 "Strawberries grow better on coconut fibre"
11/8/2017 Brown Grow opens U.S. subsidiary
11/3/2017 Enriched biochar shows good results against crazy roots
10/31/2017 Peat and Growing medium markets: supply and demand
10/20/2017 "Extending the pre-planting phase gives more control over generative growth"
10/13/2017 US: Enroot Products ships first Ameri-Coco bagged coir
10/9/2017 Norway: Miljøgartneriet chooses Pro block for plant propagation
9/28/2017 This is how it works with coir growbags
9/27/2017 Demand for biochar booms
9/27/2017 Germany: Restart for Terracult, founding MD returns
9/11/2017 "Challenging year for growing media producers"