16 The Colorado Experiment Station 
analysis XIII. 
RESIDUE FROM GROUND WATER. 
Calcic Sulfate . 
Magnesic Sulfate .. 
Magnesic Chlorid . 
Potassic Chlorid . 
Sodic Chlorid . 
Sodic Carbonate . 
Sodic Nitrate . 
Iron and Aluminic Oxids. 
Silicic Acid . 
Loss (water, organic matter, etc.) . 
Orchard No. 2. 
Per Cent. 
. 22.077 
. 14.405 
. 0.833 
. 0.441 
. 44.492 
. 1.741 
. 10.545 
. 0.256 
. 0.067 
. 5.143 
100.000 
Each imperial gallon of this ground water contains 237.0 
grains of sodic nitrate. The ground water from Orchard No. 1 
contained 941 grains, almost exactly four times as much. 
The next place studied included both orchard and non-orchard 
land, but for the sake of convenience we will designate it as Or¬ 
chard No. 3. 
This is, in some respects, the most interesting case that I have 
studied because I have been able to obtain its history. The land 
showed some spots 17 years ago on which there appeared to be too 
much alkali. Some of the spots grew nothing but at their outer 
edges things grew well. The owner stated that he had often stood 
on a barren spot and thrown his hat in the air so that it would fall 
on the grain at the edge of the spot and lodge on the heads of the 
grain. This man had tried to wash it off; he had turned a furrow, 
followed with a subsoil plow and then turned in a hundred inches 
of water and washed it clean. His farm is beautifully leveled. He 
had also manured heavily but he has not yet conquered these spots. 
He states that in the 16 or 17 years past he has set one piece to 
young trees two or three times and there are no living trees there 
now. In June, 1908, I took a set of samples from this piece of 
ground. The top three inches is described as alkali and mealy soil. 
This three-inch section was removed and taken as one sample. 
Water soluble equalled 5.04 per cent. 
ANALYSIS XIV. 
WATER SOLUBLE PORTION OF ALKALI AND MEALY SOIL. 
Orchard. No. 3. 
Per Cent. 
Calcic Sulfate . 14.247 
Magnesic Sulfate . 4.4 64 
Potassic Sulfate . 2.459 
Sodic Sulfate . 6.849 
Sodic Chlorid . 33.607 
Sodic Nitrate . 35.582 
Silicic Acid . 0.208 
Loss (water, organic matter, etc.) . 2.581 
100.000 
