New York AGrRicuLTURAL EXPERIMENT SvTaTIon. 477 
from 270 tons with corn to 576 tons with clover per ton of dry 
matter.” No figures are given for grass hay but that for clover 
is given above and for oats 503.9 tons and for barley 464.1 
tons are given. We may assume, lacking definite figures, that 
a hay composed of orchard grass, timothy and blue grass would 
require as much as barley, the plant requiring the least water 
of the three plants having similar habits of growth given above, 
or 464.1 tons per ton of dry matter in the hay. Several com- 
petent farmers were asked to estimate the amount of hay per 
acre the sod plat of this experiment would produce. The low- 
est estimate was two tons (equal to 1.7 tons of dry matter) 
and this figure we shall take. (Plates XXV and XXVI give an 
idea of the stand of grass on the plat.) Assuming then that 
the two tons of grass grown on each acre of the plat require 689 
tons of water we find that to make this amount of water per 
acre requires 6.32 inches of rainfall. Since the average rain- 
fall in this region for the six growing months, as shown in 
Table X, is but 17.78 inches there are but 11.46 inches left 
for apples and to provide for evaporation, the surface run-off 
and for subterranean drainage. 
TABLE X,— AVERAGE RAINFALL FOR THE GROWING MONTHS AT ROCHESTER 
— AUCHTER ORCHARD SEVEN MILES DISTANT. 

Years. April. | May. | June. | July. | Aug. | Sept. |Totals. 
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