True Organic citrus and avocado food contains 7% calcium to help prevent blossom end rot and is blended from natural and organic farm-grade ingredients used to make fertilizers for America's organic produce growers. The ingredients are proven to be extremely beneficial for both plants and soil including seabird guano - a great source of phosphorous and slow release nitrogen. Shrimp shell and crab shell meal - a premium, sustained supply of calcium and nitrogen for both soil and plants. Poultry manure - ethically sourced from organically raised birds, unlike other 'organic' fertilizers that source from conventional farms. Soybean meal - organically sourced. No sludge, fillers or additives.