In series No. 3 the sub-irrigation was accomplished by bury- 

 ing perforated 2-inch galvanized iron pipes in the soil and supply- 

 ing the water through these. In all cases the sub-irrigated plants 

 were grown either alternately or in a bench beside those plants 

 which were top-watered, and all differences likely to arise from 

 exposure, etc., were obviated so far as possible. It should be 

 pointed out, however, that the results given in the tables repre- 

 sent the averages of many crops growing under similar condi- 

 tions, in which a number of plants was employed in each experi- 

 ment. Individual variation has therefore been largely eliminated, 

 and the results should represent fairly true averages. 



From a study of the results shown in Table I it will be noted 

 that the percentage of rot was much less in the sub-irrigated plots 

 than in the top-watered plots. Careful records were also kept 

 of the weight of the fruit as well as of the yield, with the result 

 that the average weight of the fruit of the sub-irrigated plants 

 was found to be 36% more than that of the top-watered plants. 

 There was a dift'erence of 17% in the amount of fruit produced 

 in favor of the sub-irrigated plants, which exhibited a more 

 luxuriant growth and developed thicker stems and darker colored 

 foliage, besides setting their fruit earlier as a rule than the others. 



After the above experiments w^ere completed, some further 

 experiments were made during the summer of 1908 under the 

 personal supervision of Director Brooks, relating to the influence 

 of soil moisture on the blossom end rot. These experiments 

 W'cre made in galvanized iron pots containing about 35 pounds 

 of soil, all of which was treated with a complete fertilizer. The 

 pots were placed on trucks and were kept outdoors, except in 

 rainy weather, when they were removed to the greenhouse. Nine 

 pairs of pots were arranged and the water content of the soil 

 was maintained at 50% of the total capacity, until the plants 

 commenced to blossom, after which time the water contents ot 

 the pots were maintained as follows : 



Table II, Showing Pot Experiments with the Blossom End 

 Rot of Tomatoes. 



Pair 1, Pots A and B, containing 15% moisture. 



3, 

 3, 

 4, 

 5, 

 6, 

 ^, 

 8, 

 9, 



A and B, " 25% 



A and B, " 35% 



A and B, " 45% 



A and B, " 55% 



A and B, " 65% 



A and B, " 75%- 



A and B, " 85% 



A and B, " 90% 



