34 



Irrigation and Drainage 



In this case it will be seen that a decidedly smaller yield is 

 associated with a much larger amount of water applied at shorter 

 intervals, but why this should be does not appear, unless the 

 manure had become exhausted and the plants were not properly 

 fed. The vines in all cases were abnormally small, and looked 

 starved. 



In the experiments with both barley and clover, the small 

 cylinders were used set into the ground in the field. Two cylin- 

 ders were used for the barley and four for the clover, one -half of 

 them filled with the yellowish sand referred to, well manured, 

 and the other filled with good soil. All the cylinders were 

 weighed and watered once each week, holding them at a constant 

 weight, and the results are given in the table below: 



Barley, 1895 

 Sand Soil 



The mean annual yield of clover on the sand for the two years 

 was 5.807 tons of dry matter per acre, using 27.37 inches of 

 water, and the mean product for both crops on the good soil for 

 the two years was 6.262 tons of dry matter per acre, using an 

 average of 29.59 inches of water to produce it. 



In addition to the field results which have now been presented, 

 measuring the water used in the production of crops in Wisconsin, 

 we have obtained some results in essentially the same manner, 

 except that the cylinders were made deep enough to contain four 



