188 Irrigation and Drainage 



Maize planted 30 inches x 30 inches, 4 stalks in a hill, or 30 

 inches x 7.5 inches in drills, might yield 22,090 pounds of dry 

 matter per acre and 9,574 pounds of kiln -dried shelled corn, 

 equal to 170.4 bushels, or 187.44 bushels containing ]0 per cent 

 of water. 



Maize planted 30 inches x 15 inches, 4 stalks in a hill, or in 

 drills 30 inches x3% inches, might yield, if every stalk equaled the 

 average of the 40 stalks cited above, 44,180 pounds of dry matter 

 per acre and 19,148 pounds of kiln-dried shelled corn, equal to 

 340.8 bushels, or 374.88 bushels when containing 10 per cent of 

 moisture. 



Some of the yields here computed have been realized under 

 field conditions, but the higher ones never have been and prob- 

 ably never can be, under any system of culture as a single crop. 

 In our experimental work with the large cylinders, the largest 

 yield we have obtained was 34,730 pounds of water-free sub- 

 stance when 4 stalks occupied a soil space of 1.767 square feet, 

 which is closer planting than the closest given above, namely 

 rows 30 inches apart, with corn in drills, stalks \% inches apart. 



The largest yield we have secured in the field was on an 

 area of irrigated ground measuring about 2,400 square feet, where 

 the amount of dry matter per acre was 29,000 pounds, or 14.5 

 tons. In this case, the corn was planted in rows 30 inches apart 

 and in hills 15 inches apart, with 3 to 5 stalks in a hill. The area 

 was not an isolated plot, but was a selected spot in an irrigated 

 area where, on account of a sag in the ground, the corn had 

 received more than the average amount of water. The closeness 

 of planting in this case was equivalent to drilled rows with 1 stalk 

 every 3% inches, which is the same as the closest given above, 

 but the corn was a variety of flint maize, not dent. 



THE OBSERVED YIELDS OF MAIZE PER ACRE PLANTED 



IN DIFFERENT DEGREES OF THICKNESS AND WITH 



DIFFERENT AMOUNTS OF WATER 



It has been possible, with our irrigation, to make a direct test 

 of the influence of the amount of water on closeness of planting 



