Keith_Beef
Novice equestrian, accomplished equichetrian
The lead level looks high, too. Is your land in an area where there were lead or tin mines?
I had a look in Advanced Grassland Management, hoping I'd find some detailed info about how different forage plants take up minerals from the soil and concentrate these in their leaves and stems, but there is not much, other than a passing remark in the description of red fescue, that "its main drawback is low digestibility and poor mineral concentration".
The book doesn't have much horse-specific information at all: a table of seed mixtures and two paragraphs of text on pp36-37.
One table of interest might be 14.1 on p150, Mineral composition of herbage.
Major Elements
P 2 - 3 g/kg of Dry Matter
K 15 - 40 g/kg of Dry Matter
Ca 5 - 15 g/kg of Dry Matter
Mg 1.2 - 2.8 g/kg of Dry Matter
Na 0.5 - 5 g/kg of Dry Matter
S 2 - 5 g/kg of Dry Matter
Cl 4 - 20 g/kg of Dry Matter
Minor Elements
Fe 100 - 300 ppm
Mn 20 - 200 ppm
Zn 15 - 50 ppm
Cu 5 - 15 ppm
Co 0.1 - 0.2 ppm
I 0.2 - 1.0 ppm
Se 0.1 - 1.0 ppm
B 1 - 10 ppm
Mo 0.2 - 3 ppm
I had a look in Advanced Grassland Management, hoping I'd find some detailed info about how different forage plants take up minerals from the soil and concentrate these in their leaves and stems, but there is not much, other than a passing remark in the description of red fescue, that "its main drawback is low digestibility and poor mineral concentration".
The book doesn't have much horse-specific information at all: a table of seed mixtures and two paragraphs of text on pp36-37.
One table of interest might be 14.1 on p150, Mineral composition of herbage.
Major Elements
P 2 - 3 g/kg of Dry Matter
K 15 - 40 g/kg of Dry Matter
Ca 5 - 15 g/kg of Dry Matter
Mg 1.2 - 2.8 g/kg of Dry Matter
Na 0.5 - 5 g/kg of Dry Matter
S 2 - 5 g/kg of Dry Matter
Cl 4 - 20 g/kg of Dry Matter
Minor Elements
Fe 100 - 300 ppm
Mn 20 - 200 ppm
Zn 15 - 50 ppm
Cu 5 - 15 ppm
Co 0.1 - 0.2 ppm
I 0.2 - 1.0 ppm
Se 0.1 - 1.0 ppm
B 1 - 10 ppm
Mo 0.2 - 3 ppm