26 



CIRCULAR 862, U. S. DEPARTMENT OF AGRICULTURE 



Table 8. — Effect of parathion in the soil in the greenhouse on the growth of 

 seedlings, up to 17 months after application, Beltsville, Md., 19U8-U9 (see 

 also table 9) 





Dupli- 

 cate 



tests 



Seedling weight in response to pounds 



per acre 



of parathion 





Crop grown 







shown 









L.S.D.i 









1.5 



3.0 



6.2 



12.5 



25.0 



50.0 



100.0 







Num- 























ber 



Grams 



Grams 



Grams 



Grams 



Grams 



Grams 



Grams 



Grams 



Grams 



Bean, lima 2 __ 



1 



6.7 



6.8 



7.0 



6.7 



6.6 



6.8 



6.8 



6.7 



(3) 



Bean, lima-*__ 



1 



10.9 



12.7 



11.7 



12.6 



12.0 



12.0 



11.0 



9.8 



(S) 



Bean, snap =-. 



3 



14.3 



15.3 



15.3 



14.7 



14.0 



14.3 



9.7 



10.9 



2.8 



Cucumber 4 _ 



1 



5.3 



5.9 



6.8 



10.1 



9.5 



7.7 



14.1 



14.7 



(3) 



Cucumber 6 __ 



] 



7.9 



8.9 



13.0 



8.2 



8.2 



12.0 



9.3 



9.3 



(3) 



Muskmelon 



2 



2.3 



2.1 



2.3 



2.7 



3.2 



3.1 



2.3 



.9 



2.2 



Peas, garden'' 



1 



2.4 



2.3 



2.5 



2.4 



2.6 



2.2 



2.6 



2.3 



(3) 



Peppers 8 



■ 



2.0 



1.3 



1.2 



1.1 



1.4 



1.8 



1.1 



1.7 





Rye 9 



3 



3.8 



3.8 



4.1 



4.4 



5.0 



3.9 



5.5 



5.0 



lr3 



Squash* 



1 



33.8 



29.7 



44.3 



43.9 



48.8 



53.0 



31.9 



34.7 



(3) 



Tomatoes 10 __ 



3 



8.0 



10.3 



11.1 



10.8 



11.6 



11.7 



13.4 



6.0 



4.0 



Mean 1 ! 







6.4 



7.0 



7.5 



7.4 



7.4 



7.6 



7.6 



6.7 





1 Least significant difference at the 5-percent level. 

 - 7 varieties. 



3 Differences among treatments not significant. 

 ■± 1 variety. 



5 Tested within 6 months of soil treatment. 



6 8 varieties. Variation that is evident is associated with random variations in stand, 

 = —.93. 



7 8 varieties. 



8 5 varieties, not replicated. 



9 3 varieties. 

 10 2 varieties. 



n Values for squash omitted. Means not weighted. 



Table 9. — Effect of parathion mixed with soil, November and December 191+7, 

 on germination and stand of certain seeds, Beltsville, Md., 19U8-1+9 (see 

 also table 8) 



Crop 



Date sown 



Stand of plants in response to pounds per acre of parathion 

 shown 



L.S.D.1 









1.5 



3.0 



6.2 



12.5 



25 



50 



100 



Tomato __ 

 Bean 



Jan. 7, 1948 

 do 



Per- 

 cent 



73 

 72 



Per- 

 cent 

 61 

 71 



Per- 

 cent 



57 

 59 



Per- 

 cent 



56 

 71 



Per- 

 cent 

 41 

 59 



Per- 

 cent 



46 

 46 



Per- 

 cent 



27 

 62 



Per- 

 cent 

 30 



43 



Per- 

 cent 

 13 

 28 



Mean 





73 



66 



58 



64 



50 



46 



45 



37 



10 









Tomato 



Bean 



Feb. 27, 1948 

 do 



59 

 65 



70 

 67 



61 



49 



48 

 56 



60 



62 



62 

 69 



51 

 49 







46 

 18 



(2) 

 40 



Mean 





62 



69 



55 



52 



61 



66 



50 



32 



13 









Rye 



Bean 



Feb. 27, 1948 

 do 



50 

 65 



65 

 67 



43 

 49 



50 

 56 



44 

 62 



55 

 69 



43 



49 



35 



18 



(2) 



40 



Mean 





53 



66 



46 



53 



53 



62 



46 



27 



12 









Rye . 



Bean 



Apr. 14, 1948 

 do 



52 



94 



47 

 88 



46 

 95 



52 

 89 



39 

 94 



51 

 97 



43 



77 



31 

 64 



(2) 

 ( 2 ) 







73 



67 



71 



70 



66 



74 



60 



47 



17 









Peas 



Do 



Cucumber- 

 Do 



Lima bean. 

 Do 



Jan. 17, 1949 



do 



Apr. 4, 1949 



do 



May 2, 1949 

 do 



58 

 54 

 65 

 42 

 95 

 95 



66 

 45 

 41 

 39 

 95 

 95 



61 

 43 

 37 



14 

 97 

 92 



62 



65 

 51 

 31 

 94 



94 



60 



40 

 48 

 45 

 95 

 95 



46 

 33 

 20 

 39 

 95 

 91 



69 

 46 

 69 

 23 

 97 

 92 



33 



45 

 39 

 48 

 95 

 94 



(2) 

 (2) 

 (2) 

 (2) 

 (2) 

 (2) 



1 Least significant difference at the 5-percent level. 



2 Differences among treatments not significant. 



