Dec. 15. 1914 Oil Content of Seeds and Nutrition of Plant 



233 



experiment ranged from 35 to 50. Data were also obtained as to the 

 effects of the two treatments on the general development of the plant, 

 as indicated by the height, the weight of the air-dry root and stalk minus 

 the leaves, and the total yield of seed. The results are presented in 

 Tables III and IV. 



Table III. — Oil cotitent of soy beans as affected by partial defoliation 



Variety and treatment. 



Date of 

 blooming. 



S. P. I No. 32907: 



Control 



Nimiber of leaves reduced to 

 about 40 per cent of normal 

 on June 29. July 16,22, 30, and 

 Aug. 14 



Number of leaves reduced to 

 about 50 per cent of normal at 

 same periods as above. ,' 



Control 



Number of leaves reduced to 

 about 40 per cent of normal on 



Aug. I and 15 



S. P.I. No. 2r755: 



Control 



Number of leaves reduced to 

 about 40 per cent of normal on 



July 15 and 30. 



S. P. I. No. 30599: 



Control 



Niunber of leaves reduced to 

 about 40 per cent of normal on 



July 15 and 2a 



S. P. I. No. 30745: 



Control 



Number of leaves reduced to 

 about 40 per cent of normal on 



July IS and 22 



S. P. I. No. 30593: 



Control 



Number of leaves reduced to 

 about 30 per cent of normal on 

 July IS and 75 percent Aug.i:; 



July 30 



do., 

 do.. 



..do 



July 8 



..do 



..do 



do., 

 do., 



.do., 

 do. 



.do.. 



Aver- 

 age 

 weight 

 of stalk 

 and 

 root. 



Gm. 

 33-7 



24.0 

 ,36.8 



24.1 

 9-7 



S-3 

 24-5 



16.5 



24- S 



16.7 



27.2 



Aver- 

 age 

 height 



of 

 plant. 



Aver- 

 age 



yield 



of beans 



per 



plant 



Inches. 



22. 2 



20.4 

 25. 2 



21. S 

 II. I 



9-7 



27.0 



21.5 

 24.1 



19-2 

 24.4 



S6.6 



42.2 



SI.2 



30- 7 

 24.5 



II. 5 

 61. I 



55- 2 

 SS.6 



32.1 

 59-4 



33-8 



Weight 

 of 1. 000 

 beans. 



Gm. 



89.8 



8s-4 



8s. 6 

 87.1 



81.8 

 209.0 



16S.S 

 179-4 



167. S 

 192.6 



180.0 

 190.3 



160.4 



Mois- 

 ture in 

 beans. 



P.ct. 



7-4S 



6.65 



6.75 

 8.6s 



S-SS 

 6. 20 



6. 25 



7-95 



6.05 

 6. 70 



6. 40 



Oil in 

 moist 

 beans. 



P.ct. 



16.7s 



17.80 

 17.20 



17.85 

 16. 21 



16.32 

 19-95 



20.93 

 19.80 



20.35 

 20.93 



Oil in 



1,000 



beans. 



Gm. 



is-o 



15-2 

 JS-o 



14.6 

 33-9 



27- S 

 35-8 



3S-t 

 38-1 



36.6 

 39-8 



Considering, first, the effects of partial defoliation (Table III), in all 

 cases the weight of the root and stalk, the height of the. plant, and the 

 total yield of beans are decidedly reduced. The size of the beans, how- 

 ever, is only slightly reduced, so that the decreased yield is due almost 

 entirely to the smaller number of beans developed. It is an interesting 

 fact that the small decrease in size of the beans is almost exactly offset 

 by the increase in percentage of oil, so that the actual quantity of oil 

 in the individual seed remains practically the same. This fact only 

 holds apparently within certain limits, for in the case of the variety 

 designated as " S. P. I. No. 30593," where the defoliation was nearly 

 three-fourths complete, the decrease in. size of the bean was too great to 

 be fully offset by the higher percentage of oil. The most striking excep- 

 tion, however; is shown by S. P. I. No. 21755. Th's variety differs from 

 the others in that the seed are matured a very short time after bloom- 

 ing. Ill the present case the seed were fully ripe on August 26, whereas 

 67235°— 14 4 



