You are viewing all Organic Growers Supply products related to “Soil Amendments.”
Amendments and Fertilizers
Amendments and Fertilizers
Tired of ineffectively mixing fertilizers or potting soil ingredients together in a wheelbarrow or tractor bucket? Let us do the dirty work for you! Buy ingredients from us or bring your own. read more
Amendments and Fertilizers
Biochar helps your soil sequester more carbon and emit less nitrous oxide. Also provides a dream home for beneficial bacteria and fungi, while preventing essential nutrients from leaching away. read more
Soil Testing & Organic Fertilizer Recommendation Service
out-of-stock, Unavailable for Spring 2024
Don’t guess—test! You’ll learn your soil pH, organic matter percentage, levels of common minerals and nutrients, plus we’ll offer customized recommendations to correct or improve your soil read more
Animal-based
Animal-based
NPK: 0-16-0. Provides large amounts of readily available phosphorus. A most economical source of P for deficient soils. May be applied without restrictions to organically certified fields. read more
Minerals
Mineral
Soluble borate for fluid fertilizers and nutrient sprays. Boron is essential for all stages of tree growth and fruit set. Powder mixes easily in any spray solution. read more
Mineral
Mineral
Contains over 67 minerals beneficial to plants and animals. A mix or particle sizes. Lots of powder, but still less dusty than Micronized Azomite. read more
Mineral
Contains over 67 minerals beneficial to plants and animals, including rare earth elements. read more
Mineral
A paramagnetic stone powder for remineralizing and enhancing general foundational soil fertility. read more
Mineral
Natural phosphorus source. Adequate phosphorus results in more vigorous early root formation, better flower and seed production, better growth in cold temperatures, and better water use efficiency. read more
Mineral
Contains about 5% potassium in very slow-release form. Can be added to the soil in large amounts without altering the pH. Greatly enhances soil structure and promotes healthier plants. read more
Mineral
A powerful soil restoration amendment! Supports plant health and increases yields by facilitating roots’ uptake of plant nutrients and water. Improves levels of carbon and humus. read more
Mineral
A good source of immediate potassium for depleted soil and of magnesium where calcium is abundant. Alliums like its sulfur and potatoes like its quick boost of potassium. read more
Mineral
Calcium helps strengthen plants’ cell walls, improving crop quality, disease resistance and storage capacity. Can help prevent problems like blossom end rot and bitter pit. read more
Micronutrients Liquid Copper
currently on backorder, ETA 9/1
Copper is necessary for efficient photosynthesis and respiration and affects the sugar content and flavor of produce. Contains 4% chelated copper derived from copper sulfate. read more
Mineral
Iron is essential for chlorophyll development and function, and is also involved in nitrogen fixation by legumes. Contains 5% chelated iron derived from ferrous sulfate. read more
Micronutrients Liquid Manganese
currently on backorder, ETA 9/1
Manganese helps plants to synthesize chlorophyll and is used in electron transport during photosynthesis. Contains 1% nitrogen from vegetable protein and 5% chelated manganese. read more
Mineral
Micronutrients Liquid Zinc
low stock
Zinc is a component of auxin, an essential growth hormone, and is also necessary for proper root development. Improves cold tolerance. Contains 7% zinc derived from zinc sulfate. read more
Mineral
Magnesium is a building block of chlorophyll and therefore essential to efficient photosynthesis. May boost yields significantly, especially for roses and tomatoes. read more
Mineral
Recommended by soil gurus Phil Callahan and Mark Fulford. Lowest concentration of heavy metals of any phosphate source. Concentrations of available phosphate were regularly over 6% when tested. read more
Mineral
The most common and most frequently used soil conditioner. also called Hi-Cal lime. Recommended for soils with excess magnesium. read more
Mineral
The least expensive liming agent. Use to sweeten soil (raise pH) and provide calcium where excess magnesium is not a problem. read more
Mineral
Agricultural Sulfur. Use to make soil pH more acidic. Often helpful for both lowbush and highbush blueberries, and for potatoes. Lowering the pH of gravel paths will help control weed growth. read more
Mineral
Silicon is linked to improved yields, especially recommended for cannabis, orchard crops, cucurbits, sweet corn, grains and forage crops. Also helps build resistance to powdery mildew. read more
Mineral
Zeolites can improve the productivity of any texture of soil, improving water and mineral retention in sandy soils and improving aeration and minimizing compaction in heavier soils. read more
Planting Mixes
Formulated to build humus, enhance CEC, and condition the soil in which the ancient roots reside, whether they be abandoned heirlooms or wild seedlings. Can be applied in fall or spring. read more
Planting Mix
A blend of granite meal, K-Mag, sulfur, Tennessee brown rock, compost, peat, and Azomite. Brings down the soil pH and provides the nutrients necessary for healthy blueberry plants and good fruit. read more
Planting Mix
For a deluxe tree planting spot, choose this mix! Contains a broad spectrum of macro and micronutrients and soil conditioners that fruit trees thrive on. Follow our directions for use in the fall. read more
Planting Mix
A balanced fertilizer to keep your bearing fruit trees healthy and productive. If your tree put on 4" or less of terminal growth last year, our Fruition Mix will put new spring in its step! read more
Planting Mix
Recommended for fruit trees at planting time. Our own well-balanced blend of Tennessee brown phosphate, alfalfa meal, Azomite, and K-Mag in a humus-rich base of worm castings. read more
Planting Mix
Spread this this blend of granite, zeolites, gypsum, micronutrients and humates in that fall, and it will improve soil structure, remineralize, and enhance nutrient availability for the next spring! read more
Planting Mix
NPK: 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 critters. read more