SOILS AND FERTILIZERS 



347 



Name as published. 



Changed to 



Selma silt loam 



Shelby clay 



Sierra adobe 



Sierra loam 



Snake River sand 



Soledad gravelly sand.. 

 Sturgis fine sandy loam. 



Sunnyside sand 



Susquehanna gravel.... 



Tazewell silt loam 



Triassic stony loam 



Vernon fine sand 



Vernon loam 



Volusia sandy loam 



Waldo loam , 



Walla Walla loam 



Warwick sandy loam... 



Westphalia sand 



Willis sand 



Windsor sand 



Winnebago sandy loam. 

 Yakima gravelly loam . . . 

 Yakima sandy loam 



Yakima stony clay 



Yazoo clay 



Yazoo heavy clay.. 

 Yazoo silt loam.... 



Norfolk sandy loam. 



Shelby loam. 



Sierra sandy adobe: Placentia clay loam adobe. 



Sierra loam adobe. 



Yakima fine sand. 



Maricopa gravelly sand. 



Norfolk fine sandy loam. 



Yakima fine sand. 



Norfolk gravel. 



Miami silt loam. 



Penn stony loam. 



Miller fine sand. 



Vernon silt loam. 



Volusia loam. 



Wabash silt loam. 



Walla Walla silt loam. 



Norfolk coarse sandy loam. 



Norfolk fine sand. 



Norfolk fine sandy loam. 



Norfolk coarse sand. 



Marshall sandy loam. 



Gal latin gravelly loam. 



Yakima silt loam; Yakima loam; Yakima fine 



sandy loam. 

 Rough stony land. 



Waverly clay; Crawford clay; Wabash clay. 

 Wabash heavy clay. 

 Wabash silt loam. 



.(Bu. Soils, Bs. 15, 16, 17, 22, 23, 24, 25, 27, 28, 29, 30, 31, 32, 

 33, 34, 35, 36, 37, 38, 39, 40, 41, 44, 45, 46, 47, 48, 49, 55; Purdue 

 Univ. B. 33; R. I. Ex. Sta. B. 68; Univ. Wis. B. 204; Bu. of Soils 

 B. 35; F. B. 446; F. B. 88.) 



Effects of Climate on the Soil The differences in climate not 

 only affect the plant directly but have a great effect upon the soil and 

 its chemical properties or composition particularly in regard to the 

 chemistry of its organic constituents making the soil to this extent 

 a different soil and thus affecting the plant. 



The first condition determining the proper agricultural use to 

 which any soil can be put is climate, which limits broadly the zone 

 or area in which certain field crops can be grown, and which affects 

 the yield and quality of the products to a very marked degree, even 

 within the area of profitable cultivation. The climate of the conti- 

 nental United States varies greatly, probably much more than is 

 generally realized. 



In the southwest we have the semitropical arid climate ; in south- 

 ern Florida the semitropical humid climate. Over the country as a 

 whole we have from more than 60 to less than 10 inches of rainfall 

 and a range of mean temperature of more than 70 F. to less than 

 40 F. The elevation of our arable lands varies from below sea level 

 to over 6,000 feet above. We also have varying types of rainfall; 

 the greatest precipitation may occur in the winter months or may 

 come in the summer months. We have great differences in relative 

 humidity and in sunshine; differences in the range of temperature, 

 both seasonal and daily, and differences in the length of the growing 

 season. Finally, differences due to slope, exposure, large bodies of 

 water, and to other conditions too subtle to measure, which may de- 

 termine the special fitness of a soil for a particular grade or quality 



