Toxicity Studit 
Plants 
A. —Effect of dicyanodiamide on cowpeas grown on Norfolk sandy loam. The applications are expressed 
as pounds NHj per acre. 1, no nitrogen; 2, dicyanodiamide, 5; 3, dicyanodiamide 10; 4, dicyano¬ 
diamide 20; 5, dicyanodiamide 40; 6, dicyanodiamide, 80. 
B. —Growth of cowpeas on Norfolk sandy loam, receiving a constant quantity of sodium nitrate and vary¬ 
ing quantities of dicyanodiamide. The applications are expressed in pounds NHs per acre. 1, no 
nitrogen; 2, sodium nitrate 40; 3, sodium nitrate 40, dicyanodiamide 5; 4, sodium nitrate 40, dicyano¬ 
diamide 10; 5, sodium nitrate 40, dicyanodiamide 20; 6 sodium nitrate 40, dicyanodiamide 40; 7, 
sodium nitrate 40, dicyanodiamide 80. 
C. —Growth of cowpeas on Norfolk sandy loam receiving a constant quantity of dicyanodiamide and 
varying quantities of sodium nitrate. The applications are expressed as pounds NHi per acre. 
1, no nitrogen; 2, dicyanodiamide 40; 3, dicyanodiamide 40, sodium nitrate 5; 4, dicyanodiamide 40, 
sodium nitrate 10; 5, dicyanodiamide 40, sodium nitrate 20; 6, dicyanodiamide 40, sodium nitrate 40; 
7, dicyanodiamide 40, sodium nitrate 80. 
D. —Effect of dicyanodiamide on cowpeas grown on Chester loam. The applications are expressed as 
pounds NHi per acre. 1, no nitrogen; 2, dicyanodiamide 5; 3, dicyanodiamide 10; 4, dicyanodiamide 
20; 5, dicyanodiamide 40; 6, dicyanodiamide 80. 
