SPRING CEREALS AT MORO, OREG. 3 



land to a rise of 11 feet per 100. A contour map of the substation is 

 shown in figure 3. 



For the purpose of comparing the soil and climatic conditions at 

 Moro with those of other localities, a brief description is given of the 

 soil and climate at the substation. 



SOIL. 



The soil at the substation is the fine silt loam characteristic of a 

 large portion of the Columbia Basin. It is classified by the Bureau 

 of Soils as Yakima silt loam. It is derived largely from the decom- 





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A R N E Y 



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Fig. 2. — Map of Oregon, showing contour lines east of the Cascade Range and the location of the Eastern 

 Oregon Dry-Farming Substation, at Moro. 



position of the basaltic or lava rock by which it is underlain. Unlike 

 some of the soils nearer the Columbia River, the percentage of sand 

 is not high enough to cause trouble from soil shifting or blowing. 

 The soil is easily worked and requires little cultivation to put it in 

 good tilth, the only implements really necessary for making a good 

 seed bed being a plow and a spike-tooth harrow. The disk harrow, 

 however, is frequently used prior to plowing, and a bar weeder for 

 surface cultivation of the summer fallow. According to Bradley, 1 

 the general composition of eastern Oregon soils, of which the sub- 

 station soil is typical, is as shown in Table I. 



i Bradley, C. E. Soils of Oregon. Oreg. Agr. Expt. Sta. Bui. 112, 48 p. 1912. 



