{"product_id":"calphos-soft-rock-phosphate-5-lb-bag","title":"Calphos Soft Rock Phosphate (5 lb bag)","description":"\u003cp\u003eThis 5 lb bag of Calphos Soft Rock Phosphate is sized for raised beds, individual planting areas, and gardeners who need a manageable amount of a slow-release phosphorus and calcium amendment. Its fine texture makes it easy to mix into soil or compost before planting.\u003c\/p\u003e\u003ch3\u003eWhen to use it\u003c\/h3\u003e\u003cp\u003eUse Calphos when a soil test shows that phosphorus is needed, particularly when preparing beds for root development, flowering, or fruiting crops. The material averages about 20% P₂O₅, including 3% available phosphate, plus approximately 18% calcium. Because phosphorus moves slowly through soil, incorporate it into the root zone rather than leaving it only on the surface.\u003c\/p\u003e\u003ch3\u003eApplication\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eFor phosphorus-deficient soil, the general published rate is 5 lb per 100 sq ft; reduce the rate for more fertile soil.\u003c\/li\u003e\n\u003cli\u003eFor trees and perennials, published guidance ranges from 1–10 lb per planting hole depending on plant size.\u003c\/li\u003e\n\u003cli\u003eConfirm the appropriate rate with a current soil test and local recommendations.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eOrganic status:\u003c\/strong\u003e This repackaged 5 lb size is not represented as organic or as listed or approved for certified organic production. The \u003ca href=\"https:\/\/www.groworganic.mom\/products\/calphos-soft-rock-phosphate-regular-powder-50-lb\"\u003e50 lb original package\u003c\/a\u003e carries its own organic-use listing; that status does not transfer to this repackaged size.\u003c\/p\u003e\u003cp\u003eLearn more in our guide to \u003ca href=\"https:\/\/www.groworganic.mom\/blogs\/articles\/how-to-use-fertilizers-soft-rock-phosphate\"\u003eusing soft rock phosphate\u003c\/a\u003e.\u003c\/p\u003e\u003cp\u003eCompare this product with additional \u003ca href=\"\/collections\/nutrient-specific-fertilizers\"\u003enutrient-specific fertilizers\u003c\/a\u003e selected for garden and farm fertility programs.\u003c\/p\u003e","brand":"Grow Organic","offers":[{"title":"Default Title","offer_id":41677553565809,"sku":"F715","price":8.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0061\/1391\/9089\/files\/F715_Calphos_Soft_Rock_Phosphate_5lbs_w_gloves.jpg?v=1766096338","url":"https:\/\/www.groworganic.mom\/products\/calphos-soft-rock-phosphate-5-lb-bag","provider":"Grow Organic","version":"1.0","type":"link"}