36 T. Lyttleton Lyon and James A. Bizzell 



TABLE 10. Nitrates in Millet or Soy Beans Alone and in Unplanted Sections op 

 Adjacent Plats in 1907 (Parts per Million) 



Date 



Plat 5 

 Millet 

 sown 



June 18 



Plat 4 

 Un- 

 planted 



Plat 6 



Millet 



sown 



July 24 



Plat 7 

 Un- 

 planted 



Plat 8 



Millet 



sown 



August 6 



Plat 10 



Un- 

 planted 



Plat 9 



Soy beans 



sown 



July 5 



Plat 11 



Soy beans 



sown 



July 24 



Plat 13 



Un- 

 planted 



July 9 

 July 15 

 July 22 

 July 29 

 August 5 

 August 12 

 August 19 

 August 25 

 September 2 

 September 16 



85 

 73 

 30 

 7 

 2 

 6 

 1 

 2 

 1 

 2 



Yield 

 per acre 



98 

 88 



110 

 92 



111 

 96 

 84 

 92 

 96 



208 



79 

 78 



114 

 73 



135 

 82 

 60 

 41 

 25 

 6 



99 



82 

 78 

 68 

 96 

 84 

 54 

 80 

 74 

 143 



100 

 62 



101 

 80 



135 



111 

 84 

 94 

 66 

 45 



Yield 

 per acre 



54 

 34 

 84 

 52 

 73 

 62 

 50 

 69 

 88 

 165 



99 

 60 

 76 

 19 

 9 

 4 

 3 

 2 



10^ 



53 

 26 

 74 

 54 

 57 

 75 

 55 

 55 

 52 

 145 



57 

 30 

 82 

 60 

 56 

 79 

 79 

 69 

 90 

 183 





Yield 

 per acre 



Yield 

 per acre 



Yield 

 per acre 







4,999 

 pounds 



dry 

 matter 



2,026 

 pounds 



dry 

 matter 



772 

 pounds 



dry 

 matter 



3,700 

 pounds 



dry 

 matter 



894 

 pounds 



dry 

 matter 





comparing the nitrates under millet sown on July 24 on plat 6 with those 

 in the check plats 4 and 7, it is seen that the first determination of nitrates 

 after the millet was up showed an increase in all three plats; but the 

 increase under the millet was 62 parts per million, while that under 

 the checks was 19 and 28 parts per million, respectively. The millet 

 sown on August 6 did not make much growth. The decrease in nitrates 

 between the analyses of August 12 and August 19 under the millet on 

 plat 8 was 27 parts per million as against 30 and 12 parts per million 

 on plats 7 and 10, respectively. Plat 9, on which soy beans were sown 

 on July 5, shows about the same nitrate content at each analysis up to 

 July 22 as does its check, plat 7; and plat 11, which was sown to soy 

 beans on July 24, continues about the same as its check until August 19. 

 Neither crop can be said to have been associated with marked increase 

 in nitrates at any stage of its growth, although the nitrate content of 

 the soil under them does not show, in early growth, the decrease that 

 would be expected. 



There is the same tendency for nitrates to continue at a low figure 

 throughout the later part of the season under millet, as has already been 

 noted under maize and oats. Although plat 4 shows an increase in 

 nitrates from 96 parts per million on September 2 to 208 parts per million 

 on September 16, plat 5 shows practically no gain, notwithstanding 



