8 



CIRCULAR 5 9, U. S. DEPARTMENT OF AGRICULTURE 



A more extensive series of soils was compared in a later test which 

 is summarized in table 8. In this experiment there again seemed to 

 be a significant tendency for the heavier soils to yield better than the 

 sandy soils. A comparatively high yield was obtained from neu- 



Figure 2. — Effect of texture of casing soil on the first break of mushrooms, 

 Arlington Experiment Farm, 1934-35: a, Keyport clay loam; b, sandy loam. 



tralized hyperhumus, but the mushrooms from the beds cased with 

 this material were inferior in quality because of excessive spotting. 

 Differences in earliness as well as in yield as a result of soil texture 

 are strikingly illustrated in figure 2. 



Table 8. — Relation of texture of casing soil to yield of cultivated mushrooms 

 [Tests made in winter of 1935-36] 



Texture and source of soil 









Yield 



Lime- 



Reaction 



Bed 



per 10 



stone 



at casing 



No. 



square 



added 



time 





feet 









Ounces 







f 1 



434 



Percent 



pll 



2 



476 



m 



6.1 



{ 3 



488 







4 



395 







I 5 



330 







f 1 



519 







2 



291 



2H 



6.8 



I 3 



412 







4 



483 







I 5 



302 







f 1 



335 







8.2 



2 

 \ 3 



325 

 349 







4 



549 







I 5 



352 







1 1 



553 







2 



285 



2H 



7.4 



\ 3 



435 







4 



487 











{ 1 



449 

 451 







2 



336 



2H 



7.4 



{ 3 



365 







4 



448 







I 5 



245 







( 1 



413 







2 



467 



2H 



7.4 



i 3 



389 







4 



278 







I 5 



382 



Mean 



yeild per 



square 



foot* 



Hyperhumus, New Jersey. 



M Keyport clay loam, Arlington, Va.+H hyperhumus, 

 New Jersey ,. 



Houston clay, Texas (high in limestone and organic 

 matter; black soil). 



Keyport clay loam, Arlington, Va. 



Do. 



Do. 



1 Standard error of the mean is 0.15 pound per square foot. 



Pounds 

 2.6 



2.5 



2.4 



2.3 



2.4 



