10 CIRCULAR 609, U. S. DEPT. OF AGRICULTURE 
TABLE 2.—Effect on the yield of mushrooms of adding to the compost superphosphate 
or gypsum and of composting for two different lengths of time with three levels of 
dried blood 
EXPERIMENTAL DATA 
| 
aed Yield when amount of dried blood added was— 
tion of 
com- . 
: Mineral] supple- | None 1 percent 3 percent 
posting | | Sums | Mean 
in days ments added | r | 
(num- a . 
gle Single | Single 
ber) | | ‘plots Mean plots | Mean plots Mean 
| Ounces! | Pounds? | Ques ee Ounces! | Pounds?| Ounces! | Pounds? 
242 | 20 | 
Superphosphate 1 | ahah: ie a 0.64 | it 0.26| 1,499] 0.78 
ercent : 
Pp : 250 | 112 | 65 
IQ suis | (3,171)} —(.79) 
i( 244 {138 58 
(Gypsum 1percent.|} 35 | TUT N ee ove lta ce a -21| 1,672| «88 
| | 187 | 78 | 56 
358 333 168 
Superphosphate1 { 307 |} 198)) 32) oar ett 160]. 3,702 | om 
percent. ‘| 292 | 342 | ‘| 298 | 
1 eee | (7,413); (1. 92) 
379 ; | 404 | 2 
(Gypsum I percent.) 55g |f 2-00. ra eee ee 1e82ele. Sect ener 
290 305 319 
———— | 
Sumiss.<ii2c es see), ee Os 7 Sem D185 9 | eae tes 10.584, 
Mean st s2 6 ier cee |e irae d Ey 24 ee ea 115A sre | eee einen < 
i 
ANALYSIS OF VARIANCE 
are | Degrees of | Sum of Mean 
Source of variation | freedom squares | square $ 
‘Betweencamounts of blood 22s == 2555 seen see eee 2 175, 280 87, 640** 
ipetween:mineralifertilizers es se eee eee 1 690 690 
Amountsion blood >@mineral fertilizerse= sss ee ae eee 2 7, 960 3, 980 
Betweenvlensths'oh com postin ogee ea cee ee ae 1 374, 886 374, 886** 
Lengths of composting X amounts of blood_____________-____-_-__-__- 2 59, 377 29, 689** 
Lengths of composting X mineral fertilizers________________---_----- 1 560 560 
Lengths of composting X amounts of blood X mineral fertilizers_____ 2 575 287 
Between beds: (blocks) M22. 52 = a a ae ee ee eee ay.) 4, 067 1, 356 
‘Beds: treatments (Ckrof) 2s 262s S Sos ee ee ae 33 80, 756 2, 447 
TO GAU 2EU 8 See eS ESS EE ee Fo ee as eee ee nee 47 (O4S1S LE See ee 
1 Per 10 square feet. 
2 Per square foot. 
3 **= Probably significant; odds greater than 99 to 1. 
