DESTEUCTION OF FLY LARV^ IN HORSE MANURE, 1915. 9 



Table 5. — Destruction of fly larvsc in horse manure^Results using calcium cyanamid 

 and acid phosphate mixture. 



[Cage experiments at Bethesda, Md., and box experiments at Baton Rouge, La., 1915.] 



Treatment of 8 bushels manure 

 followed by sprinkling with 

 10 gallons of water. 



A, 1 pound calcium cyanamid 



+U pounds acid phos- 

 phate, cages 



B, Do 



C, Control 



ID, Do 



A, 1 pound calcium cyanamid 



+8 pounds acid phos- 

 phate, cages 



B, Do 



C, Control 



,D, Do 



A,' 1 pound calcium cyana- 

 mid-t-6 pounds acid phos- 

 phate, boxes 



B, IJ pounds calcium cyana- 

 mid -(-6 pounds acid phos- 

 phate, boxes 



0,1 2 pounds calcium cyana- 

 mid-l-12 pounds acid phos- 

 phate, boxes 



.D,i Control 



Flies 



Number. 



7 



1 



982 



35 



472 



317 



4,410 



2,665 



135 

 650 



307 

 3,238 



Appar- 

 ent lar- 

 vicidal 

 action 

 (per 

 cent of 

 control 

 aver- 

 age). 



98.7 

 99.0 



83. 



95.9 

 80.0 

 90.5 



Number 

 bacteria 

 per gram 

 calcu- 

 lated to 



dry 

 weight. 



MillioTis. 



3,608 



2,646 

 18, 750 

 25,500 



20.5 

 10 

 36 

 50 



1,600 

 900 



800 

 1,400 



Ma- 

 nure, 

 total 

 nitro- 

 gen. 



Per ct. 



0.533 



.456 



.449 



.379 



.519 

 .519 

 .440 

 .582 



.449 

 .379 



Water extract. 



Alka- 

 linity, 

 cc N/20 

 NaOH 

 per 100 



cc (5 

 grams 



ma- 

 nure). 



6.25 

 5.75 

 7.25 

 8.00 



3.25 

 3.00 

 3.75 

 4.00 



1.50 

 4.00 



3.50 

 2.75 



In per cent of total 

 nitrogen. 



Nitro- 

 gen. 



Per ct. 

 33.60 

 36.84 

 29. 84 

 29.53 



25.82 

 28.71 

 25.45 

 21. 14 



38.01 

 34.11 



24.94 

 29.55 



Ammo- 

 nia ni- 

 trogpn. 



Per ct. 

 2.40 

 4.20 

 2.90 

 3.60 



5.97 

 9.06 

 1.70 

 1.72 



11.76 



11.91 



11.80 



7.92 



Amid 

 nitro- 

 gen. 



Per ct. 

 10.73 

 11.05 

 9.57 

 11.17 



13.58 

 14.26 



25.62 

 13.19 



52085°— Bull. 408- 



1 3 A, C, and D contained nitrates. 

 -16 2 



