628 Bulletin No. 188.
applied to aGraves County soil, gave a decided increase in p
` growth of Yellow Pryor tobacco over the fertilizer alone. `
5. Different sulfur compounds when added to a Fayette
V County soil, in some instances, gave decided gains in the
growth of soy beans. The best result was obtained with the _
element sulfur. The sulfur content of soy beans which re-
sponded to sulfur fertilization was in all cases higher than —
where no sulfur compound was added but this did not hold
true with respect to the protein except where ammonium
sulfate was applied. ·
6. The growth of turnips was materially benefited by
sulfur fertilizers on this soil.
7. Clover was not benefx)ed when grown in a Fayette
County soil to which sulfur fertilizers were added except
where potassium sulfate was used and this may have been
. due to the available potassium present.
8. ln a series of experiments on the Fayette County soil
with cabbage, the effect of adding the sulfates of iron, nick- ,
el, copper, cobalt, chromium,~manganese, lithium, etc., and
comparing them with their c< responding carbonates or ox-
ides, was tried. Large amor its of these substances are
generally regarded as harmf to plant growth while some
. investigators have found that small amounts are beneficial.
The results obtained with cabbage show that only two proved
beneficial, a few had no effect, while several were harmful _
to the plant.
Sl. ln a continuation of the above experiments on the
same soil, mustard and afterwards radishes were grown.
With mustard, several of the sulfates gave good gains over the
checks and all gave higher yields than their corresponding
carbonates. ln the case of radishes. the results were more
irregular, but there is no doubt but that sulfur fertilization
in some cases was beneficial.
10. lixperiments were tried in growing alfalfa in sand
cultures so as to determine the availabilty of the sulfur in its .
different compounds for the growth of this plant. The results
show that different forms of sulfur are readily used by this T
plant for its growth. The best results were obtained re-