Blood meal runs 10-12 percent nitrogen and contains significant amounts of phosphorus.  It is the only organic fertilizer that is naturally water soluble.  Blood meal, like other slaughterhouse wastes, may be too expensive for use as a compost activator.

Sprinkled atop soil as a side-dressing, dried blood usually provokes a powerful and immediate growth response.  Blood meal is so potent that it is capable of burning plants; when applied you must avoid getting it on leaves or stems.  Although principally a source of nitrogen, I reason that there are other nutritional substances like growth hormones or complex organic “phytamins” in blood meal.  British glasshouse lettuce growers widely agree that lettuce sidedressed with blood meal about three weeks before harvest has a better “finish,” a much longer shelf-life, and a reduced tendency to “brown butt” compared to lettuce similarly fertilized with urea or chemical nitrate sources.

Feathers are the birds’ equivalent of hair on animals and have similar properties.  See Hair

Fish and shellfish waste. These proteinaceous, high-nitrogen and trace-mineral-rich materials are readily available at little or no cost in pickup load lots from canneries and sea food processors.  However, in compost piles, large quantities of these materials readily putrefy, make the pile go anaerobic, emit horrid odors, and worse, attract vermin and flies.  To avoid these problems, fresh seafood wastes must be immediately mixed with large quantities of dry, high C/N material.  There probably are only a few homestead composters able to utilize a ton or two of wet fish waste at one time.

Oregonians pride themselves for being tolerant, slow-to-take-offense neighbors.  Along the Oregon coast, small-scale market gardeners will thinly spread shrimp or crab waste atop a field and promptly till it in.  Once incorporated in the soil, the odor rapidly dissipates.  In less than one week.

Fish meal is a much better alternative for use around the home.  Of course, you have to have no concern for cost and have your mind fixed only on using the finest possible materials to produce the nutritionally finest food when electing to substitute fish meal for animal manures or oil cakes.  Fish meal is much more potent than cottonseed meal.  Its typical nutrient analysis runs 9-6-4.  However, figured per pound of nutrients they contain, seed meals are a much less expensive way to buy NPK.  Fish meal is also mildly odoriferous.  The smell is nothing like wet seafood waste, but it can attract cats, dogs, and vermin.

What may make fish meal worth the trouble and expense is that sea water is the ultimate depository of all water-soluble nutrients that were once in the soil.  Animals and plants living in the sea enjoy complete, balanced nutrition.  Weston Price’s classic book, Nutrition and Physical Degeneration, attributes nearly perfect health to humans who made seafoods a significant portion of their diets.  Back in the 1930s—­before processed foods were universally available in the most remote locations-people living on isolated sea coasts tended to live long, have magnificent health, and perfect teeth.  See also:  Kelp meal.