i88 



Journal of Agricultural Research 



Vol. XVI. No. 



and was harvesbed. When thoroughly air-dried it was weighed. The 

 results appear in Table IV. 



Table IV. — Effect of barium carbonate and stronttu-m carbonate on the growth of wheat — 



Third series 



Pot No. and treatment. 



Pot I (control), no barium added 



Pot 2 (control), no barium added 



Pot 3+2 gm. of barium ca^onate 



Pot 4+2 gm. of barium carbonate 



Pot 5+2 gm. of strontium carbonate 



Pot 6+2 gm. of strontium carbonate 



Pot 7+2 gm. of barium carbonate+2 gm. of stron- 

 tium carbonate 



Pot 8+2 gm. of barium carbonate+2 gm. of stron- 

 tium carbonate 



Pot 9+2 gm. of barium carbonate+0.7 gm. of radio- 

 active material 



Pot 10+2 gm. of barium carbonate+0.7 of gm. radio 

 active material 



Pot 1 1 +0.7 gm. of radio-active material alone 



Pot 12+0.7 &™- ^^ radio-active material alone. . . . 



Weight of dry straw. 



Observed. Average. 



Gm. 



41- 15 

 40.75 

 34-25 

 34.25 

 38-50 

 37-75 



32-25 



35-75 



37-75 



36.75 

 37-35 

 36.00 



Gain or 

 loss over 

 control. 



Gm. 



} 40. 95 

 } 34- 25 

 } 38. 12 



34.00 



37-25 

 } 36. 67 



Gm. 



— 6. 70 

 -2.83 



-6.95 



-3-70 

 -4.28 



The results in this series of experiments shoAv a loss in the weight of the 

 straw over the average weight of the straw in the control pots; however, 

 the greater loss occurs in the barium pots. The strontium pots show a 

 loss of one-half of that of the barium pots. 



The radio-active fertilizer, when used alone or in combination v>ith 

 barium carbonate, did not affect the yield of the straw greatly, the yield 

 in each case being less than that of the control. 



WINTER WHEAT 



In a fourth series of experiments winter wneat was sown in pots of 

 sand containing the same basal plant-food ration as in previous experi- 

 ments. Strontium nitrate was the compound subjected to experimenta- 

 tion in this series. The amounts added are given in Table V, which also 

 gives the yields and average weight of the grains of wheat produced in 

 in each experiment. 



The results obtained in this series of experiments show abnormal yields 

 in both grain and straw which probably are due to the large amounts of 

 nitrate radical present rather than to the strontium ion, since strontium 

 carbonate has in no instance given such marked increase in yields. 



