Appendices - Soil Essentials: Managing Your Farm's Primary Asset - page 162

Appendix 17. The average composition of the plant

The dry matter is composed of

20% dry matter

30% crude fibre
12% protein
48% nitrogen-free extracts
4% fat
6% ash

80% water

The ash is composed of

42% potassium
27.8% oxygen

5% iron
5% phosphorous

42%
potassium

4% magnesium
3% calcium
3% suphur
3% silicon
3% chlorine
1% sodium

27.8%
oxygen

0.1% boron
0.1% manganese, zinc, copper
and molybdenum together