Phosphorus containing fertilizers can contain high levels of cadmium depending upon the source of rock phosphate used in manufacturing. It occurs naturally with deposits of zinc and phosphorus but, unlike these nutrients, it is not considered essential for life. For this reason we will also discuss aluminium in terms of a heavy metal during the course of discussion.Ĭadmium is a widespread, naturally occurring, element that is present in soils, rocks, waters, plants and animals. “Heavy metal poisoning” can possibly include excessive amounts of aluminium, or beryllium (the fourth lightest element in the periodic table). It is important to note that in medical terms, heavy metals are loosely defined and include all toxic metals irrespective of their atomic weight. Other than this, aluminum (Al), while not technically a heavy metal, is another key potential contaminant in soils and fertilizers. The key problem regarding contaminants in hydroponic fertilizers are the heavy metals’, arsenic cadmium, selenium, cobalt, mercury and lead, with cadmium being the most notable of these where plant uptake is concerned. Rock Phosphates (phosphorous) and Cadmium Heavy metal concentration in soils, substrates and fertilizers (compost etc) is the dominant factor in heavy metal plant tissue contamination. Rule 2: The higher the heavy metal levels in media and fertilizers, the higher the heavy metal uptake by plants.

the use of horticultural grade fertilizers will reduce contaminants such as heavy metals. The use of analytical, food and pharmaceutical grade fertilizers vs. Rule 1: The more pure the fertilizers’ used in formulation, the fewer the contaminants. The Advantages of RTW/DTW over Recycling Systemsĭisclaimer: The following material is written in the interests of education and harm reduction.Hydroponic Lighting and Stem Elongation (stretch).Plant Canopies, Light and Photosynthesis.Indoor Hydroponic Lighting Fundamentals.Viruses and Viroids in Cannabis and Hemp.Leaf Surface Temperature (LST) in Hydroponic Growing.Vapour Pressure Deficit (VPD) for Indoor Growers.Cannabis Nutrient Tissue Analysis and Crop Nutrition.Beneficial Bacteria and Fungi Additive Quality.Beneficial Bacteria and Fungi in Hydroponics.

pH Down (Phosphoric Acid) in Hydroponics.

Beyond the Hype – About Hydroponic Nutrients.

Phosphorus and Potassium in Cannabis Production.

Light, CO2, Temperature, Relative Humidity and Photosynthesis.

Manico alluminium