Organic Fertilizer
Organic fertilizers are naturally occurring fertilizers (e.g. compost, manure).
Naturally occurring organic fertilizers include manure, slurry, worm castings, peat, seaweed, humic acid, and guano. Sewage sludge use in organic agricultural operations in the U.S. has been extremely limited and rare due to USDA prohibition of the practice (due to toxic metal accumulation, among other factors).
Processed organic fertilizers include compost, bloodmeal, bone meal, humic acid, amino acids, and seaweed extracts. Other examples are natural enzyme-digested proteins, fish meal, and feather meal. Decomposing crop residue (green manure) from prior years is another source of fertility.
Read more about Organic Fertilizer: Discussion of The Term 'organic', Advantages, Disadvantages, Conventional Farming Application
Famous quotes containing the words organic and/or fertilizer:
“The human face is the organic seat of beauty.... It is the register of value in development, a record of Experience, whose legitimate office is to perfect the life, a legible language to those who will study it, of the majestic mistress, the soul.”
—Eliza Farnham (1815–1864)
“...I was confronted with a virile idealism, an awareness of what man must have for manliness, dignity, and inner liberty which, by contrast, made me see how easy living had made my own group into childishly unthinking people. The Negro’s struggles and despairs have been like fertilizer in the fields of his humanity, while we, like protected children with all our basic needs supplied, have given our attention to superficialities.”
—Sarah Patton Boyle, U.S. civil rights activist and author. The Desegregated Heart, part 1, ch. 19 (1962)