- A range of biostimulant products has been investigated since the PRG began but some of these are no longer available.
- The sections below shows types which are currently available or under development.
- For further information on principles of biostimulants see: Biostimulants.
- For further information on principles of biological products see: Biological products.
Amino acid based products
- Any products used should be derived from plant, not animal, amino acids, to avoid problems with protocol restrictions.
- Response to amino acid products is particularly associated with amelioration of heat and / or drought stress.
Some recent experiment results are shown here.
This link provides background information.
Products associated with sugar production
- “Fulcrum” was a sugars based product (molasses extract) which was well researched by CMI. Response was most likely if plants have emerged in cold conditions or suffered damage to foliage which will restrict sugar production, e.g. frost of herbicide damage. The product is no longer available and while similar products might have similar effects these have not been tested.
- “Quantis” is reported to contain organic carbon derived from sugar processing, but also contains amino acids, and has been shown to be beneficial in conditions of heat / drought stress.
- PGA and T6P may both help to stimulate photosynthetic processes.
Seaweed extract products
- These may contain nutrients and plant hormones but the constituents may vary depending on the source material and method of extraction.
- Beneficial effects can be shown in experiments but can be hard to predict due to the complex nature of the products.
- Phosphite can stimulate plant resistance responses and improve plant health and resistance to some diseases, such as tuber blight caused by Phytophthora infestans.
- Products must use stabilised phosphite or the phosphite will be rapidly converted to phosphate.
More information on biostimulant use.
See also Phosphite section for information on use in disease suppression.
Plant growth promoting bacteria
- Different species and strains of Bacillus spp. have been shown to enhance plant growth or disease resistance.
- Effects shown for one product may not occur with another product using a different species or strain.
Potato products overview
In 2019 a summary of relevant products was produced for the PRG, broadly categorising biological and biostimulant-type products as:
- plant-active compounds
These are shown in the following sections and more details can be found in: Biologicals 2019.
Products which use specific chemical techniques to protect nutrients; or which provide inorganic compounds.
Products which use fungi, bacteria, or other small organisms to effect change.
Products using other “organic” components such as seaweed extract, humic / fulvic acids; composition may not be well defined and activity may be due to more than one component.
N.B. “Valagro” was formerly “Maxicrop”.
Products which use compounds known to be active in plants; mode of action as exogenous application may not be well-defined.
Notes on biostimulants
Nutrition 2021 (Includes current choice of biostimulant products)
Applications to seed and soil 2020 (Includes novel biostimulants investigated in experiments)
Amelioration of mid season stress 2020 (Results of experiments with biostimulants in 2019)
Biologicals 2019 (A summary of products available at this time)
Experiments performed in 2018 presented in 2019 (Includes experiments with Bacillus, amino acid and sugar products)
Enhancing crop performance: experiments performed in 2017 and presented in 2018 (Includes experiments with Bacillus and amino acid products)
Biostimulant summary 2018 (Appropriate use of sugar and amino acid products)
Amino acids 2017 (Principles of amino acid effects and experiment results)
Biologicals 2017 (Includes “Allstar” seed treatment, Bacillus products and other biologicals)
“Lantern” biostimulant 2016 (A Bacillus product for application to soil, now called “Supia”)
Biostimulants 2016 (Biostimulant types and principles)
Nutrient and “phite” decision matrix 2016 (Guide to appropriate use of phosphite and nutrient products)
Nutrition experiments in 2014 – presented 2015 (Biostimulant experiment results, extracted from the presentation below)
Cytokinins, calcium and tuberisation 2015 (Physiology; experiments with phosphite / cytokinin and with calcium / phosphite / PGA products)
Foliar nutrition 2013 (Includes experiments with Bacillus products and “Proactive MG” – a development of “Magsyn LA”)
Foliar nutrition 2012 (Includes experiments with PGA products and “Magsyn LA”)
Foliar nutrient applications 2011 (Experiments on phosphite and cytokinin products and on “Magsyn LA”)
Bacillus subtilis 2010 (Background to use of Bacillus spp.)
Biostimulant experiments 2003 analysis (Experiments on “Fulcrum” and “Enbourne” – an amino acid product)
Biostimulants 2002 (Experiments on products “TerraPy G”, “ENB 1637X”, “FTC-1”, “Stalosan G” and “Fulcrum”)
Fulcrum background 2001 (Principles of sugar deficiency during early development and response to “Fulcrum”)
Fulcrum experiments 2001 (Experiments support suggested usage)
FTC-1 application 2001 (Commercial experiments indicate some responses)
Fulcrum application 2000 (Experiments indicate appropriate conditions and timing of application)
FTC-1 growth stimulant 2000 (A product suggested to enhance root growth)
Fulcrum application 1999 (Experiments on application to stressed crops)
Fulcrum application 1998 (Further information and research on sugar availability during early plant development)
Cytokinins 1998 (Principles of cytokinin effects)
Fulcrum application 1997 (Conditions in which response might be expected)
Yeald growth stimulant 1997 (Experiments showed great er response in an unirrigated than an irrigated crop)
Huma-Gro growth stimulant 1997 (A product applied to soil and suggested to reduce leaching of nitrate)
Crop Set growth stimulant 1997 (A product applied to soil and suggested to increase nutrient availability)
Fulcrum 1996 (Importance of sugar in tuber development and experiments on “Fulcrum” application)
Yeald growth stimulant (A product containing nitrogen and zinc and suggested to improve root growth)
Early nutrition 1995 (Includes experiments with “Fulcrum”, formerly “BS100”, a sugar supplement)
Seminar 1 Notes 1992 (Chapters 8-10: Application of seaweed extracts.)