22 



CIRCULAR NO. 121, BUREAU OF PLANT INDUSTRY. 



Table II. — Sunirnanj of cli mat oJog leal obsirraliovs made at the Jliintlttj Experiment 

 Fann duriiuj the ijcurn 1911 and 191J — Continued. 



Killing Fko.sts. 



Fig. 2. — View in field K, where the irrigated rotations are conducted. There arc 2i» ditlerent rotations 

 under test, including alfalfa, sugar beets, potatoes, wheat, oats, corn, and flax. 



EXPERIMENTS WITH IRRIGATED FIELD CROPS. 

 CROP ROTATIONS UNDER IRRIGATION.^ 



For the })ur])ose of determining which systems of crop rotation are 

 best suited to conditions on the i)roject, a field containing 70 one- 

 fourth-acre plats is devoted to a series of two, three, four, and six 

 year rotations (fig. 2), in which the following crops are grown in 

 different sequences: Al*"alfa, sugar beets, potatoes, wheat, oats, corn, 

 and flax. 



This cro]>rotation work will have to be continued for several years 

 before results of much value can be obtained. The land on whicii 

 these experiments are being conducted was j)laiited to oats in 1911, 

 wliich may explain the rather low yields of some of the croi)s, })articu- 

 larly the beets, it having been noted that beets following oats on this 

 new ground do not as a rule give heavy yields. Table III gives the 

 average and maximum yields obtained in the rotation ex])eriments 

 in 1912. 



' These experiments were under the immediate supervision of Mr. James M. Spain. 

 [Cir. IL'I] 



