Dec. 2, 1918 Effect of Farm Manure on Irrigated Field Crops 501 



Table III. — Effect of manure on tlie yield of sugar beets at the Scottsbluff, Nebr., Belle 

 Fourche, S. Dak., and Huntley, Mont., field stations, igi2 to IQIJ, inclusive — Con. 



HUNTLEY 



o No manurial effect on this crop. 



In addition to recording the yield of beets from the rotation plots 

 as shown in Table III, it has been customary also to determine the 

 average size of the beets on each plot by counting and weighing the 

 product of several representative rows, to record the percentage of sugar 

 in the beets as reported by the local sugar factory upon samples from 

 each plot, and to determine the proportion cf the weight of the tops to 

 the combined weight of beets and tops. This last determination has a 

 bearing not only as showing the vigor of growth of the sugar beets, but 

 also as indicating the quantity of feed left as a by-product cf the beet 

 crop. 



The facts regarding the effect of manure on increasing the yield of 

 beets as shown in Table III, and also as to the effect on size of beets, 

 percentage of sugar in the beets, and percentage of tops, are summarized 

 for each of the three stations as follows : 



At Scottsbluff the yield of beets from the 46 plot-years, omitting 

 rotations 20 and 21 in 191 2, averaged 15.3 tons per acre, while the mean 

 annual difference in favor of the manuring is 4.3 ±0.28. The size of 

 beets from the same plots averaged 1.55 pounds, with a mean annual 

 difference in favor of the manuring of 0.32 ±0.044. The percentage of 

 sugar in the beets was not determined in 191 2, so that the results of 

 only 40 plot- years are available. This averaged 16.5 per cent, with a 

 mean annual difference in favor of the unmanured plots of 0.12 ±0.20, 

 which is not significant. The percentage of the weight of top to the 



