- Commercial Manager Spain
- Crop Farm Manager Sharjah
- Commercial Manager Soft Fruits
- Assistant Nursery Manager - Tasmania, Australia
- Tissue Culture Lab / Operations Manager - Victoria, Australia
- Irrigation Manager - Tasmania or Victoria
- Chief Executive Officer Hortifrut IG Berries
- Head of Operations - Dubai, United Arab Emirates
- Greenhouse grower / production manager - Brazil
- Experienced International Trade Specialist
Top 5 -yesterday
Top 5 -last week
Top 5 -last month
Establishing growing substrate pH with compost and limestone
The two objectives of this study were to determine the resulting pH of substrates created with varying amounts of limestone and compost and assess the impact of the various amounts of limestone and compost on pH buffering capacity. Compost was created from a 1:1:1 weight ratio of a mixture of green plant material and restaurant food waste:horse manure:wood chips.
The first experiment was a factorial design with five compost rates (0%, 10%, 20%, 30%, and 40% by volume), four limestone rates (0, 1.2, 2.4, and 3.6 g·L−1 substrate) with five replications. The experiment was conducted three times, each with a different batch of compost.
With 0 lime, initial substrate pH increased from 4.5 to 6.7 as compost rate increased. This trend occurred at all other lime rates, which had pH ranges of 5.2–6.9, 5.6–7.0, and 6.1–7.1 for rates of 1.2, 2.4, and 3.6 g·L−1 substrate, respectively. Substrate pH increased significantly as either compost or lime rates increased.
The second experiment was a factorial design with four compost rates by volume (0%, 10%, 20%, and 30%), the same four limestone rates as Expt. 1, and five replications. Each substrate treatment was titrated through incubations with six sulfuric acid rates (0, 0.1, 0.2, 0.4, or 0.7 mol of H+ per gram of dry substrate).
Substrates with a similar initial pH had very similar buffering capacities regardless of the compost or limestone rate. These results indicate compost can be used to establish growing substrate pH similar to limestone, and this change will have little to no effect on pH buffering capacity.
Click here to access the study.
Receive the daily newsletter in your email for free | Click here
Other news in this sector:
- 2022-06-30 ZipGrow and Growfoam partner up to improve distribution of carbon-neutral substrates
- 2022-06-24 Re-Nuble partners with circular materials company to create growing media
- 2022-06-16 The growing success of a happy company
- 2022-06-13 Estonia: Supply chain challenges aside, demand for peat is skyrocketing
- 2022-06-10 Dutch scale-up presents new lineup of growing substrates
- 2022-05-05 "High-quality coir grow bags allow for flexibility and re-use"
- 2022-04-22 Growing blueberries on substrate in South Africa
- 2022-04-20 Substrate cubes and slabs offer aubergine grower maximum steerability and control
- 2022-04-11 "China's peat development still needs to overcome challenges "
- 2022-04-08 How this Kansas City urban farm turns food scraps into soil
- 2022-04-08 China: Actively promoting the construction of peat supply chain
- 2022-04-06 Diverting spent greenhouse growing media away from landfill into sustainable solutions
- 2022-03-31 Paper-based growing concept introduced to Benelux
- 2022-03-30 North American coir demand keeps on growing
- 2022-03-22 Ireland: Research shows retail price compression forced growers out of business
- 2022-03-14 New research to boost hydroponic farming production begins in Tshwane, South Africa
- 2022-03-11 "It's essential to reconsider how we extract peat"
- 2022-03-10 These Spanish systems grow strawberries in substrate
- 2022-03-09 "Alternatives to peat available, but none can replace peat on their own"
- 2022-03-08 Inside a UAE farm that grows figs and tomatoes using 'breathable' sand