Soil amendments fertilizers
At Preferred Source, we represent a comprehensive line of soil amendments and fertilizers developed to address nutrient imbalances, improve soil structure, and optimize plant performance. Each product is selected for its proven effectiveness in supporting soil biology, nutrient availability, and long-term field health. Whether you’re rebuilding soil structure, enhancing microbial activity, or fine-tuning fertility inputs, these tools can be tailored to meet your specific crop and soil conditions.
Contact Kevin to discuss a customized program designed to maximize your soil’s potential and deliver consistent, sustainable results.
GSR Dormant Calcium
GSR Dormant Calcium corrects calcium deficiencies and soil structure without harming soil health. It offers electrically available calcium in a dry, water-soluble form, requiring minimal application. This product addresses compaction and promotes soil microbial health Approved for organic use, Preferred Source can integrate it into your sustainable soil management program.
GSR Growing Calcium
GSR Growing Calcium enhances plant health by addressing soil limitations. It targets roots directly for efficient uptake and is applied in grams per acre. This water-soluble solution works with GSR Dormant Calcium to improve soil health and crop performance.
Azomite Field Grade
Azomite® is a natural mineral from Utah that boosts root development and plant vitality. It helps crops grow faster and resist pests. Preferred Source proudly offers Azomite for healthier fields.
Azomite Micronized
Azomite® Micronized offers the same benefits as Azomite Granular but in a finer powder form. Its small particle size allows for faster absorption and integration into the soil, making it ideal when rapid nutrient availability is needed.
Azomite Granular
Azomite® improves soil health and fertility by replenishing essential nutrients. This supports stronger plant growth, higher crop yields, and better nutritional quality in produce.
Fish Hydrolysate
Fish Hydrolysate FP-LL15 is an organic fertilizer made from fresh and fresh-frozen cod and salmon frames. It can be applied to soil or as a foliar spray and is effective at all growth stages, supporting improved crop quality, performance, and yields.
Ferti Corn Steep
Ferti-Corn Steep Powder provides essential nutrients, including nitrogen, phosphorus, and potassium, to boost plant growth. Non-toxic and eco-friendly, it enhances soil structure, fertility, and microbial activity, promoting healthier, more productive soil.
Manda Harvest HV
Manda Harvest HV is crafted from naturally fermented ingredients, backed by 23 years of research. It enhances plant and vegetable growth, boosts root and early-season development, improves stress tolerance, and increases yields across multiple cultivations.
Fish & Crab Powder
Introducing ourronized Soluble Fish with Crab (10-2-0), an efficient alternative to liquid fish fertilizers. This formula dissolves easily in water for smooth application via drip systems or foliar sprays. Packed with nutrients and chitin, it boosts plant vigor and soil. Available in 25 lb. boxes, with bulk pricing upon request.
