32 



UNIV. OF N. H. AGE. EXPERIMENT STATION 



[Bulletin 221 



Table XIX — Average early and total yields per plant of tomato varieties at different 



dates during the season 



greater tendency for the plants to wilt during periods of rather low soil 

 moisture content. The tendency for the nitrate-fertilized plants to 

 show a greater amount of wilting than unfertilized plants has been par- 

 ticularly marked just previous to and during the ripening period. It is 

 possible that this greater tendency to wilt may account for the decrease 

 in the crop where nitrate of soda has been used. 



In the spring of 1924 a new bed of strawberries was set. This bed was 

 divided into thirty one-twentieth acre plots. Five series of treatments 

 were provided for, each treatment being repeated four times. 



A very uniform and excellent stand of plants was produced on all plots 

 during the summer of 1924. Very dry weather occurred during the fall 

 months of 1924, and although no wilting took place it is probable that 

 the bed suffered from lack of moisture during this period. The drought 

 was followed by a very heavy rainfall late in the fall. 



In the spring of 1925 observation of a large number of plants by S. W. 

 Wentworth showed that winter injury of the roots and particularly of 

 the crowns had been unusually severe. The pith area of the crowns 

 of approximately 10 per cent of the plants was brown, the only Hve tissue 

 of the crown being the extreme outer layers of tissue. Blossom buds 

 were not developed on the winter injured plants. The yield on all plots 

 was, therefore, unusually low, but since the injury was apparently uniform 

 throughout the field, its effect upon yield should be uniform for all plots. 



At no time during the spring of the fruiting year did the plants suffer 

 from lack of moisture. 



As is shown in Table XX, the only treatment which gave a signifi- 

 cant increase in yield was where hen manure was applied at the rate of 

 1,000 pounds per acre. 



PLANT PATHOLOGY 



Effect of Fungicides and Insecticides on Plants (Adams Fund) 



Bordeaux mixtures containing from three to five times as much lime 

 as copper sulphate have been recommended for use on plants sensitive 



