The ability of roots to reduce ferric iron to ferrous iron was determined at harvest when plants were in full-bloom.
(The ability of roots to reduce ferric iron to ferrous iron; was determined; L:at harvest; T:when plants were in full-bloom) (plants; were; in full-bloom)
The ability of roots to reduce ferric iron to ferrous iron plants
was determined were
L:at harvest T:when plants were in full-bloom
in full-bloom