Agriculture Reference
In-Depth Information
There are a number of available sources for organic
fertilizers. Some come premixed, or you can make them
yourself from individual components.
Making your own premixed fertilizer is easy. For N, you can
use alfalfa meal, soybean meal, or blood meal. For P, bone
meal and rock phosphate work well. For K, wood ashes,
greensand, and seaweed will work. The foregoing list is far
from exhaustive, but the materials are readily available from
most garden or agricultural stores.
Table 1
contains two numbers notated as either “leaf” or
“root” because root crops don't need as much nitrogen as
leafy vegetable crops. In fact, too much nitrogen can hurt the
productivity of root crops. There's also no reason to formulate
a fertilizer for depleted soil since that shouldn't happen after
the first year, and maybe not even then if adequate compost
has been added. If it does, just add triple or quadruple the
amount used for adequate soil. Looking at these tables, it
should be pretty easy to formulate a couple of ready-made
fertilizers.
Table 1: Nitrogen Sources
Table 2: Phosphorus Sources
