228 EXPERIMENT STATION RECORD. [Vol.43 



(3) wheat, oats, and corn; (4) wheat, oats, and potatoes; (5) wheat con- 

 tinuously; (6) wheat, timothy, and clover two years, oats, and corn; (7) 

 wheat, barley, potatoes, and oats; and (8) wheat, barley, oats, and corn. These 

 rotations are based on the prevailing system of cropping with grain two years 

 followed by one year fallow. The varieties grown are Red Russian wheat, 

 Swedish Select oats, Blue Prussian peas, Rustlers White Dent corn, White 

 Winter barley, Gold Coin and Early Ohio potatoes, and Medium Red clove/. 

 Tabulated results are given with reference to the influence of fertilizers and 

 manure, the effect of the preceding crop on yields of wheat and oats, and the 

 influence of climate, principally precipitation and temperature. 



The data secured in the fertilizer tests are regarded as indicating that 

 nitrogen is most likely to be the limiting factor when the deficiency is a plant 

 food element. Good results have been obtained with manure by using it as a 

 surface dressing on wheat and by plowing it into the ground to be planted to 

 corn. 



Potatoes, followed in their order by fallow, peas, and corn, had the most 

 beneficial effect on a succeeding wlieat crop. Planting corn, peas, or potatoes 

 proved nuich more economical than summer fallowing every third year. A 

 comjiarisou of gross incomes for four rotations showed that corn, giving the low- 

 est income of all rotations in which crops were substituted for the summer 

 fallow, gave .$22.44, potatoes $39.G6, and peas $99.35 for the extra labor involved 

 in growing the crop. 



The general results further indicated that the quantity of moisture may 

 prove a serious limiting factor in production on this type of soil, and that 

 in its cultivation attention must be given to moisture conservation. Lack of 

 rain and high temperatures during the growing period affected coirn and potatoes 

 much less than they did wheat, oats, or peas. 



[Report of the] department of agronomy, C. S. Knight (Nevada Sta. Rpt. 

 1919, pp. 17-2Jf). — The results of irrigation experiments with alfalfa and wheat, 

 previously reported in detail and noted (E. S. R., 41, p. 728), are briefly re- 

 viewed, and data secured in variety testing and crop improvement work are 

 presented. 



Row and plat tests were conducted with wheat, oats, and barley. Among 

 wheat varieties, each grown in a row 100 ft. long. White Club, Galgalos Fife 

 C. I. No. 2398, New Zealand, Defiance, and Colorado No. 50 led in average yield 

 with the rates of 49.2, 49.0, 47.8, 47.5, and 47.1 bu. per acre, respectively. White 

 Club and Colorado No. 50 had been grown five years and the other varieties 

 four years. The leading varieties of oats in similar row tests were Early 

 Mountain No. 2 C. I. 656, Early Mountain C. I. No. 754, and Black American, 

 yielding respectively an average of 78.5, 64.8, and 58.2 bu. per acre for four 

 years. The highest producing barley varieties and their average yields for 

 three to live years were as follows : Swedish Gold, 84.6 ; Princess, 70.4 ; Trebi, 

 64.3 ; Chevalier, 62.8 ; Blue Ribbon, 60.8 ; and Moravian, 60.4 bu. per acre. The 

 varieties mentioned are 2-rowed except Trebi, which is a 6-rowed variety. It 

 is pointed out that Swedish Gold has a very short straw, which will prevent 

 its introduction on a commercial basis. 



In the plat tests seven varieties of wheat were grown from one to three 

 years. White Club, grown for three years, ranked first with an average yield 

 of 39.3 bu. per acre, being followed by Rieti, grown for two years with 34.5 bu., 

 and Marquis, grown only one year with 33.1 bu. per acre. Of the six varieties 

 of oats tested in a similar way Early Mountain No. 2 and Abundance, grown 

 for two years, led with average yields of 39.5 and 28.9 bu. per acre, respectively, 

 and Great Dakota, grown for three years, stood next with an average yield of 



