You are viewing all Organic Growers Supply products related to “Soil Amendments.”
Amendments and Fertilizers
Amendments and Fertilizers
If you’re tired of ineffectively mixing fertilizers or potting soil ingredients together in a wheelbarrow or tractor bucket, let us do the dirty... read more
Amendments and Fertilizers
Join the carbon-farming revolution. Biochar is the product of heating organic matter in a low-oxygen environment: instead of releasing the carbon... read more
Amendments and Fertilizers
Don’t guess—test! Applying fertilizers and soil amendments without the guidance of a professional soil test is like driving downtown with your... read more
Animal-based
Animal-based
(0-16-0, 32% P2O5, approx. 30% Ca) Burned bone meal provides large amounts of readily available phosphorus. The most economical source of P for... read more
Minerals
Mineral
(Sodium Tetraborate, 20.5% B) Soluble borate for fluid fertilizers and nutrient sprays. Boron is essential for all stages of tree growth and fruit... read more
Mineral
(0-0-52) The most economical source of available potassium. Moderate to fast-release. If your soil has sufficient magnesium, this is the potassium... read more
Mineral
(33% CaCO3) When the price of aragonite spiked a few years ago, we tried to steer growers toward the chemically identical Calcitic Limestone, but... read more
Mineral
(0-0-0.2, 1.8% Ca) Named for its A-to-Z of Minerals including Trace Elements; contains over 67 minerals beneficial to plants and animals.
A mix of
... read more
Mineral
(0-0-0.2, 5% Ca) Named for its A-to-Z of Minerals including Trace Elements; contains over 67 minerals beneficial to plants and animals.
A mix of
... read more
(0-0-0.2, 5% Ca) Named for its A-to-Z of Minerals including Trace Elements; contains over 67 minerals beneficial to plants and animals, including... read more
Mineral
(49.3% SiO2, 13.3% Al2O3, 9.2% CaO, 5.7% MgO, plus trace minerals) A paramagnetic stone powder from the Pioneer Valley of Massachusetts for... read more
Mineral
(0-7-0, 20% total Phosphate, plus at least 30% Ca and 10% SiO2. Natural phosphorus source from mines in British Columbia, Montana, and Mexico.... read more
Mineral
Contains about 5% potassium in very slow-release form. Plants need potassium for sugar and starch production. Granite meal can be added to the... read more
Mineral
(Calcium Sulfate CaSO4•2H2O, 21% Ca, 16% S) Gypsum is a good source of calcium when the pH is already at a desired level. The sulfur in gypsum... read more
Mineral
Max out your soil health! This is a powerful soil restoration amendment designed to raise your soil’s cation exchange capacity while adding high... read more
Mineral
(10.8% Mg, 22% S) Langbeinite is a marine deposit of potassium sulfate and magnesium sulfate in soluble form. A good source of immediate potassium... read more
Mineral
Manganese helps plants to synthesize chlorophyll and is used in electron transport during photosynthesis. Manganese availability may be limited by... read more
Mineral
Calcium helps strengthen plants’ cell walls, improving crop quality, disease resistance and storage capacity. Calcium uptake may be reduced by... read more
Mineral
Copper is necessary for efficient photosynthesis and respiration and affects the sugar content and flavor of produce. Copper availability may be... read more
Mineral
Iron is essential for chlorophyll development and function, and is also involved in nitrogen fixation by legumes. Iron availability may be limited... read more
Mineral
Zinc is a component of auxin, an essential growth hormone, and is also necessary for proper root development. Adequate zinc improves cold... read more
Mineral
(9.8% water-soluble Mg, 12.9% S) Magnesium is a building block of chlorophyll and therefore essential to efficient photosynthesis. In... read more
Mineral
(0-3-0, 21-25% total P2O5) 40% CaO. The consistency of rich soil. Comes from the washing piles left behind when high-grade ore was extracted to... read more
Mineral
Pro-Select Prill (87% CaCO3, 7% MgCO3). Cal Carb Equivalent 95.8%. The most common and most frequently used soil conditioner. Calcitic is the... read more
Mineral
Pelleted Dolomitic Limestone (57.7% CaCO3, 33% MgCO3). Cal Carb Equivalent 96.9%. The least expensive liming agent. Use to sweeten soil (raise pH)... read more
Mineral
Agricultural Sulfur. 90% elemental sulfur, 10% bentonite clay. Use to lower soil pH (make it more acidic). Often helpful for both lowbush and... read more
Mineral
(48% CaO and 52% SiO2). Cal Carb Equivalent 76.0%. Soluble-grade and at least 95% pure (may contain trace amounts of iron, manganese and... read more
Mineral
Zeolites are aluminosilicate lattices, derived from volcanic ash, that hold up to 55% of their weight in water in the small cavities of their... read more
Planting Mixes
Planting Mix
Whether they be abandoned heirlooms or wild seedlings, tucked in the woods or growing alongside an old road, apple trees live on for hundreds of... read more
Planting Mix
A blend of Granite Meal, K-Mag, sulfur, Tennessee brown rock, Penobscot Blend Compost & Peat, and Azomite. Brings down the soil pH and provides... read more
Planting Mix
To prepare your land in fall or winter for spring fruit-tree planting, use this mix. Without digging a hole, spread one bag on an area 4–6' in... read more
Planting Mix
Planting Mix
Recommended for fruit trees at planting time. Formerly known as Fruit Tree Planting Mix. Our own well-balanced blend of Tennessee brown phosphate,... read more
Planting Mix
The last of the root vegetables have been tucked into the cellar, and the soil microbes snooze contentedly under a blanket of young winter rye.... read more
Planting Mix
(3.4-2.2-3.5) An excellent all-purpose fertilizer for those who prefer to avoid animal products. Great for flower bulbs because it won’t attract... read more