CONTRIBUTIONS FROM THE WISLEY LABORATORY. 497 



TABLE V. 



Average Produce from Plants in Hows 97 to 102. 



Row 



Xo. of 



Aver. wt. 



Aver, wt. 



Percentage difference from 

 yield in row 100 



plauts 



of pods 



of peas 



Wt. of 

 pods 



Wt. of 



peas 



97 



51 



grs. 

 58-9 



grs. 

 31-8 



-4 



+ 1 



98 



51 



50-8 



28-5 



-18 



-9 



99 



45 



55-9 



30-3 



-9 



-4 



100 



34 



61-2 



31-3 







101 



37 



65-0 



32-2 



+ 6 



+ 3 



102 



2(3 



675 



33-9 



+ 10 



+ 8 



The average yield of shelled peas varied within rather narrow limits ; 

 but, perhaps, the most extraordinary result is in Row 98, where the 

 lowest average yield was obtained, and where, after the soil and the 

 seed and the plants were themselves inoculated (a treble inoculation), 

 the average yield of pods was 18 per cent, below that of the row which 

 was not inoculated or manured at all, and the yield of shelled peas was 

 9 per cent, below. 



It is suggestive, too, to compare the average yield from the plants 

 watered with the inoculating material with those watered with the 

 ammonium phosphate only (though on account of other differences of 

 treatment the comparison is not quite a fair one). The average yield of 

 the plants which were watered with " Nitro-Bacterine " in the three rows 

 was 55'1 grammes, that of the other plants 64 grammes. The plants 

 inoculated by watering thus gave an average yield amounting to only 

 86 per cent, of that of those not watered with the inoculating material. 



These results, as far as they go, tend to corroborate those obtained by 

 the other methods of inoculation, and to further emphasize the need of 

 investigation into the relative virulence of different races of nodule- 

 producing bacilli. 



The remark made in the "Conclusion" on p. 253 that "it is not 

 claimed for this experiment that it shows what is to be expected under 

 all conditions, or that under no conditions is inoculation of leguminous 

 plants likely to be followed by increased yield," may be repeated. But 

 the results based upon the average yield from the plants in this part of 

 the experiment point to the same conclusion as was given in paragraph 12 

 on p. 254 and repeated on p. 495. 



Summary. 



1. The average yields of the plants in the different rows of ' Ne Plus 

 Ultra ' and ' Maincrop ' are considered and found to corroborate the 

 conclusion arrived at in the former Report. Only seven out of twenty- 

 four rows of inoculated seed gave a greater yield than the uninoculated, 

 one gave an equal yield, and sixteen gave a smaller. 



2. The results obtained by watering peas with "Nitro-Bacterine" 

 are given and point to the same general conclusions as have been 

 previously stated. 



vol. xxxiv. k K 



