41 6 IRRIGATION FARMING. 



water can be turned in from the irrigating ditch and 

 left to fill up the vat and flow out from a two-inch 

 auger-hole near the top. Sometimes the vats are made 

 large enough to hold two or three wagon-loads of 

 manure, and are filled with water and left to stand a 

 few days before the liquid fertilizing element is con- 

 veyed by ditch or otherwise to the growing plants. 

 These vats may be filled and emptied as desired and 

 fresh fertilizers be given the plants. There is no dan- 

 ger of conveying the odor or contaminating influences 

 of the liquid to the vegetables. 



The Corrugated Roller.— One of the most use- 

 ful machines for preparing a seed-bed in irrigated land 

 is the corrugator invented by Eugene H. Grubb, of 

 Carbondale, Colorado, and illustrated in Fig. io6. 

 There is no patent on the machine and any one may 

 make it. The main part consists of a drum or roller 

 made in two sections to toggle like a disc harrow. 

 This cylinder should be of cast iron, but may be made 

 from wood and weighted from 560 to 750 pounds while 

 in operation. It should be three feet or so in diameter. 

 The first se<5lion, or the one at the left, is thirty-four 

 inches long and has but one rim or corrugate, while 

 the other has two and is thirty-nine inches long. This 

 is made necessary to facilitate turning. The corru- 

 gates are five inches wide at the base and have a four- 

 inch flange which leaves a demarkation of similar depth 

 in the soil. A half-worn wagon tire should face each 

 wooden corrugate to keep it from wearing. A spring 

 seat is bolted on the rear of the frame, and in front 

 of each corrugate depending from the frame is a shovel- 

 plow made from ^-inch by 3-inch iron kept in place 



