The Bulletin 



37 



Loam contains more than ;5'-; per cent. Tliose lowest in this constitu- 

 ent are Iredell Loam, Cecil Clay, Mecklenburg Clay Loam, Iredell Fine 

 Sandy Loam, Durham Sandy Loam, Alamance Silt Loam, Congaree 

 Silty Clay Loam, and Mecklenburg Sandy Loam types, in the order 

 given. 



In calcium content, the Mecklenburg Sandy Loam type is decidedly 

 higher than any other soil type occurring in the county. Other types 

 of the county containing highest amounts of calcium are Congaree Silty 

 Clay Loam, Iredell Loam, Mecklenburg Clay Loam, Durham Coarse 

 Sandy Loam, Cecil Fine Sandy Loam, and Iredell Fine Sandy Loam. 

 Those containing the smallest amount of calcium are Cecil Clay Loam, 

 Durham Sandy Loam, Cecil Sandy Loam, Alamance Silt Loam, George- 

 ville Silt Loam, Cecil Coarse Sandy Loam, Alamance Slate Loam, and 

 Cecil Clay. 



Fig. 10. — Iiiii)i-ovins tlie land liy growing corn and cowpeas in alternate rows 



WILAT EXPERIMENTS HAVE SHOWN TO BE THE CHIEF NEEDS OF THE SOILS 



The results of field experiments that have been conducted for three 

 years on Mecklenburg Clay Loam type in this county, and for a num- 

 ber of years on the Cecil Clay Loam type in Gaston County, on Cecil 

 Clay and Iredell Loam in Mecklenburg County, and on Cecil Clay 

 Loam in Iredell County, have shown as an average that, generally speak- 

 ing, nitrogen and phosphoric acid are the jilant-food constituents gen- 

 erally needed by most of the soils occurring in the county. Nitrogen is 

 especially essential at this time. Applications of potash have not gen- 

 erally been found to be absolutely essential for general crops, .such as 

 small grains, corn and cotton, in order to be assured of good yields. 

 Where kainit has been used on cotton that is subject to rust, with such 



