ed no phosphorus; Plats 5
and 11, no nitrogen; and Plat 6 was the check. The materials were
applied at such rates that they provided for the first year 72 pounds
of nitrogen per acre, 25 pounds of phosphorus and 59 pounds of
potassium; and for each of the last four years two-thirds as much
nitrogen and phosphorus and eight-ninths as much potassium. The lime
was applied the first and fourth years in quantity to make a ton to
the acre annually. Cover-crops were sown on all plats alike and were
plowed under in late April or early May of each year. These differed
in successive years, but included no legumes. The crops used were rye,
wheat, barley and cow-horn turnips separately and the last two in
combination.

"The cultivation differed only in thoroughness from that generally
used in the Belt, the aim being to maintain a good dust mulch during
the whole growing season. Pruning by the Chautauqua System was done
throughout by one man, who pruned solely according to the vigor of the
individual vines and left four, two or three, or no fruiting canes as
appeared best. The vineyard was thoroughly sprayed, all plats alike.

"Low winter temperatures, affecting immature wood and buds caused by
unfavorable weather of the previous season, reduced yields materially
during two of the five years, and practically neutralized any
anticipated benefit from fertilizers. Following the first of these
low-crop years, came a season, 1911, in which favorable conditions,
acting upon vines left undiminished in vigor by the light crop of the
previous year resulted in heavy and quite uniform yields on all the
plats.

"The yields for the five years are shown in Table I; and a summary
showing the average gains from each treatment is given in Table II,
with the average financial balance after deducting the cost of
fertilizer application from the increased returns from the plats
receiving them.

TABLE I.--YIELD OF GRAPES (TONS PER ACRE) IN FERTILIZER EXPERIMENTS

=========================================================================
Plat.| | | | | | |5-year
No. | | 1909 | 1910 | 1911 | 1912 | 1913 |avg.
-----+-------------------------+------+------+------+------+------+------
| |_Tons_|_Tons_|_Tons_|_Tons_|_Tons_|_Tons_
1 |Complete fertilizer; lime| 4.48 | 2.10 | 5.37 | 3.46 | 2.14 | 3.51
2 |Complete fertilizer | 4.76 |