SPUING CEREALS AT MORO, OREG. 



X N 



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which occur during the late spring, summer, and autumn months are 

 of such a nature that practically all of the water is absorbed by the 

 soil, but much of the winter precipitation is frequently lost as run-off. 

 As is shown in Table II, the wettest months are November, December, 

 and January. Much of the precipita- 

 tion during these months is usually in 

 the form of snow. 



The 1 1-year average precipitation by 

 months is shown graphically in figure 5. 



The precipitation available for grow- 

 ing cereals during any particular season 

 in this section is largely that which 

 falls from September 1 to August 31. 

 In comparing crop production with 

 precipitation data, therefore, records 

 for calendar years are not so valuable 

 as those for crop years ending August 

 3 1 . The precipitation which falls dur- 

 ing the growing season is also an im- 

 portant factor in influencing crop yields. 

 The average seasonal precipitation for 

 small grains (March to July, inclu- 

 sive), as shown in Table III, is 3.83 

 inches. 



Table III gives precipitation records 

 for each of the five crop years for which 

 results are reported in this bulletin, 1911 to 1915, inclusive, and also 

 the precipitation for the' growing season in each of those years. 



Table III. — Precipitation at Moro, Oreg., in crop years (ending Aug. 31) and in the 

 growing season (March to July, inclusive) , for five years, 1911 to 1915, inclusive. 





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Fig. 5.— Diagram showing the average 

 monthly precipitation in inches at Moro, 

 Oreg., during the 11 years from 1905 to 1915. 



Period. 



Inches. 



Period. 



Inches. 



Annual: 



Sept. 1, 1910, to Aug. 31, 1911 



8.47 

 14.19 

 11.08 

 12.53 

 13.31 



Seasonal: 



Mar. 1 to July 31, 1911 . 



2.29 



Sept. 1, 1911, to Aug. 31, 1912 



Mar. 1 to July 31, 1912 



3.24 



Sept. 1, 1912, to Aug. 31, 1913 



Mar. 1 to July 31, 1913 



5.06 



Sept. 1, 1913, to Aug. 31, 1914 



Mar. 1 to July 31, 1914 



3.67 



Sept. 1, 1914, to Aug. 31, 1915 



Mar. 1 to July 31, 1915 4. 91 











11.92 



3.83 





It will be observed that the crop year of 1912, from the standpoint 

 of precipitation, was the most favorable for crop production of any 

 of the five years for which data are here given. The crop year of 1911 

 was very unfavorable, the total precipitation being only 8.47 inches, 

 of which only 2.29 inches fell during the growing season. The 

 average for the five years ending August 31 is 0.57 inch more than 



