20 N. H. AGE. EXPERIMENT STATION. [Bulletin 198 



effect on the plants last year from both nitrate and phosphate, but the 

 yield was not sufficient to warrant taking records. This experiment should 

 give definite information on the value of fertilizers and manures on New 

 Hampshire soils. 



Grapes. — A new vineyard constituting 411 vines of 15 varieties was planted 

 in 1919. The vineyard is in good condition and should begin to bear next 

 year. Up to date the Lucile variety has made the best growth and given the 

 best stand of plants of any variety included. 



Blueberries. — Work on propagation of blueberries was continued during the 

 season 1920. 



Experiment in Maintaining Fertility in the Garden. — This experiment was 

 started in the spring of 1918. Prior to that the land had been plowed and 

 planted to potatoes, and was treated uniformly throughout. It was then laid 

 off in one-eighth acre plots measuring 155 by 35 feet. One half of each plot is 

 treated with ground limestone at the rate of 2000 poxmds per acre every other 

 year in addition to the other fertility applied . 



The treatments of the different plots are as follows: 



Plot 1 — 32 tons of manure per acre. 



Plot 2 — 24 tons of manure per acre and the following commercial fertilizer 

 per acre: 150 pounds tankage; 100 pounds nitrate of soda; 600 pounds 

 acid phosphate, 150 pounds muriate of potash. 



Plot 3 — Green manure plus the following commercial fertilizers per acre: 

 160 pounds nitrate of soda; 250 pounds tankage; 800 pounds acid phos- 

 phate; 300 pounds muriate of potash. 



Plot 4 — 16 tons of manure and the same fertilizer treatment as Plot 3. 



Plot 5— Check plot. 



Plot 6 — 8 tons of manure and the same fertilizer treatment as Plot 3. 



Plot 7 — Green manure plot. 



In 1918 the plots were planted to Red Kidney beans. The total yield was 

 in almost direct proportion to the amount of manure applied to the plots, but 

 there was no increase from commercial fertilizer. Plot 7, which was the green 

 manure plot, did not receive any treatment because the experiment was just 

 started and there was insufficient time to grow a green crop to plow under. 



In 1919 the crop grown was sweet corn, and yield records for both ears and 

 stover were taken. The same fertilizer treatments were used as in 1918. The 

 effects of the lime were quite apparent. 



The striking lesson thus far obtained was the remarkable response which all 

 crops made to manuring the land. On the other hand, the response from 

 chemical fertihzers without the use of manures on a green crop was very small. 

 The 1919 season, however, was very dr\', and a fair test from the fertilizers 

 could scarcely be expected. 



In 1920 the plots were planted to potatoes, and the results showed increased 

 yields from the use of chemicals. The largest yield was on Plot 6. More 

 manure, as used on Plots 1, 2 and 4 did not increase the yield. 



Pruning. — A pruning experiment in the apple orchard at the Horticultural 

 Farm is being continued, and the trees are attaining sufficient size to show 

 very interesting results. The types of pruning include the following: 



