From: Effects of compost on onion quality, yield, and thrips infestation
Constituent
Quantity
% N
1.1
Nitrate, ppm
3,320
% P
2.0
% K
% Na
0.2
% Ca
4.9
% Mg
0.6
Zn, ppm
265
Fe, ppm
11,600
Cu, ppm
65
% S
Mn, ppm
484