ARSENICAL DUSTING OF CABBAGE O 



The results of experiments 2 to 6 at Charleston and of experiments 

 1 to 6 at. Baton Rouge are given in tables 3 and 4, respectively. 



Table 3. — Arsenic residue 1 on cabbage dusted with different quantities, dilutions, 

 and numbers of applications of paris green, lead arsenate, and calcium arsenate, 

 experiments 2 to 6, Charleston, S. C. 



From last dusting to sampling 



Period 



Dura- 

 tion of 

 period 



Rainfall 



Total 

 applica- 

 tions 



Residue of AS2O3 per pound of market- 

 able cabbage 



Paris green and lime 



Parts by 

 weight. 

 1 to 10 



Parts by 



weight, 



1 to 9 



Lead 



arsenate 



and lime, 



parts by 



weight, 



lto5 



Calcium 

 arsenate, 

 undi- 

 luted 



Experiment 2: 



Dec. 23-Jan. 2 



Dec. 14-Jan. 2 



Dec. 3-Jan. 2 



- Nov. 23-Jan. 2 



Nov. 12-Jan. 2 



Nov. 2-Jan. 2 



Oct. 20-Jan. 2 



Oct. 8-Jan. 2 



Experiment 3: 



Mar. 16-Mar. 30 



Mar. 2-Mar. 30 



Feb. 16-Mar. 30 



Feb. 2-Mar. 30 , 



Jan. 19-Mar. 30 



Jan. 5-Mar. 30 



Dec. 22-Mar. 30 



Experiment 4: 



Apr. 20-Apr. 30 



Apr. 10-Apr. 30 



Mar. 31-Apr. 30 



Mar. 23-Apr. 30 



Mar. 13-Apr. 30 



Mar. 3-Apr. 30 



Feb. 22-Apr. 30 



Feb. 13-Apr. 30 



Jan. 31-Apr. 30 



Jan. 20-Apr. 30 



Experiment 5: 



Jan. 3-Jan. 13 



Dec. 23-Jan. 13 



Dec. 14-Jan. 13 



Dec. 4-Jan. 13 



Nov. 24-Jan. 13 



Nov. 15-Jan. 13 



Nov. 4-Jan. 13 ■__ 



Checks: Jan. 13 2 „_ 



Experiment 6: 



May 1-May 11 



Apr. 21-Mayll 



Apr. 11-Mayll--.- 



Mar. 31-May 11 



Mar. 22-May 11_... 



Mar. 12-May 11 



Mar. 2-May 11 



Feb. 20-May 11 



Checks: May 11 2 



Days 



Inches 

 0.06 

 .51 

 .80 

 1.31 

 2.25 

 3.18 

 5.35 



.33 

 1.22 

 2.53 

 6.95 

 8.84 

 11.26 

 11.32 



1.14 

 1.76 

 2.47 

 2.47 

 2.80 

 3.69 

 3.69 

 5.00 

 9.73 

 11.31 



.30 

 .84 

 .87 

 1.34 

 1.46 

 1.60 

 2.28 



Number 



Grain 

 0. 0790 

 .0160 



.0100 

 .0030 

 .0020 

 .0010 

 .0010 

 .0020 



.0261 



.0021 

 .0012 

 .0007 

 .0010 

 .0007 

 .0008 



.0163 



.0042 

 .0021 

 .0004 

 .0004 

 .0004 

 .0004 

 .0004 

 .0004 

 .0004 



Grain 



Grain 

 0. 0460 

 .0190 



.0070 

 .0060 

 .0020 

 .0040 

 .0020 

 . 0020 



.0103 



.0017 

 .0010 

 .0006 

 .0010 

 .0007 

 .0012 



.0110 



.0060 

 .0010 

 .0006 

 .0005 

 .0004 

 .0004 

 .0004 

 .0004 

 .0005 



.01 

 .08 

 1.33 

 1.98 

 2.29 

 2.49 

 3.22 

 3.94 



0.0430 

 .0120 



.0070 

 .0030 

 .0030 

 .0020 

 .0010 

 .0020 



.1580 

 .0280 



.0011 

 .0009 

 .0026 

 .0015 

 .0006 

 .0004 

 .0011 



0. 3680 

 .0740 

 .0400 



.0070 

 .0040 

 .0030 

 .0020 

 .0020 



.5950 

 .0120 



.0041 

 .0015 

 .0018 

 .0047 

 .0009 

 .0003 

 .0006 



1 Treatments leaving a residue exceeding the legal tolerance of 0.01 grain of arsenic trioxide per pound 

 of marketable product are shown in bold-faced type. 



2 Date of sampling. 



DISCUSSION 



According to the data presented in tables 3 and 4, Charleston 

 Wakefield cabbage grown in the Charleston, S. C, area retained 

 residues exceeding the legal tolerance of 0.01 grain of arsenic trioxide 

 per pound of marketable product when dusted with paris green and 

 lime (1 to 10) and with lead arsenate and lime (1 to 5) as many as 



