34 Nebraska Agricultural Exp. Station, Research Bui. 6. 
Four-year summary of the water requirements of crops as given by King (1895, 
page 2J>8). In addition, data are included to show the number of pots used 
and the years in which each crop was grown. 
Four-year summary as given by King (1895) 
Crop 
No. 
of 
trials 
(1) 
Dent corn . 
Flint corn . 
Red clover 1 
Barley 2 . . . 
Oats 3 
Field peas . 
Potatoes . . 
(2) 
4 
4 
3 
3 
5 
l 4 
2 
Water 
per 
pound 
of dry 
matter 
Dry 
matter 
per acre 
I Acre 
inches 
of water 
per ton 
of dry 
matter 
Compilation from four 
annual reports to show 
how King's summary was 
obtained 
Number of pots used 
1891 
Pounds 
(3) 
309.84 
233.90 
452.80 
392.89 
557.34 
477.37 
422.70 
Pounds 
(4) 
19,515 
25,099 
9,613 
10,819 
10,755 
8,017 
12,805 
Inches 
(5) 
2.64 
2.14 
4.03 
3.43 
5.02 
4.21 
3.73 
(6) 
2 
1892 
1893 
(7) 
2 
(8) 
4 ' 
1894 
(9) 
Total 
(10) 
4 
4 
2 
4 
8 
2 
2 
1 King gives three pots, but the writer can find data for only two, tested 
in 1892, with the following results: 2; 564.4; 12,486; 4.76. 
2 Apparently should read: Barley 4; 388; 10,819; 3.39. 
3 Apparently should read: Oats 8; 553.3; 10,197; 4.92. 
4 Apparently should be two pots tested. 
The data in columns 2, 3, 4, and 5 are given in this same form 
by King (1895) to show the relative water requirements of crops 
in Wisconsin. The other columns have been compiled to show 
how subject to error such a summary may be. King compares 
without qualification the water requirements of dent corn and 
barley tested during two years, 1891 and 1892, with red clover 1 
and field peas tested one year, 1892; with flint corn tested in 
1893; with oats tested in 1891, 1892, and 1894; and with potatoes 
tested in 1894. Such a summary is meaningless. 
Briggs and Shantz (1914) have largely overcome this error in 
their comparison of the water requirements of crops tested during 
three years at Akron, Colorado, by arbitrarily increasing the ratios 
for 1912 30 per cent. Certain crops had been tested all three 
years, while certain others only two or one year. The crops grown 
continuously showed practically the same water requirements in 
1911 and 1913, while the water requirement was approximately 30 
per cent lower in 1912. 
1 King apparently tested clover for two years, but the wr ter can find the 
records for only one year, 1892. 
