24 N. H. AGR. EXPERIMENT STATION. [Bulletin 203 



for the first time this season. There were no significant differences thus far 

 between the different types in either diameter of trunk, or amount of prun- 

 ings. 



Pe.\ch Fertilization. 

 The work in the peach orchard has been continued by Mr. Potter as pre- 

 viously outlined. The trees had a full bloom, but owing to frost there was 

 not enough fruit to warrant measurmg the crop. The usual growth measure- 

 ments indicate only that nitrogen is the chief element promoting growth. 

 Raspberry and Blackberry Experiment. 

 FertiHzation and culture were continued as previously, but the plantation 

 is not thriving. A small crop was harvested from the raspberries. Herbert 

 red raspberry proved the best yielder. The crop was too small and the dif- 

 ferences not pronounced enough to draw conclusions on the effect of difierent 

 fertilizer treatments. 



Grape Varieties and Fertilization. 

 This plantation is not thriving. Missing plants were replaced and the 

 usual fertihzer apphed, but no records were taken. 



Maintenance of Soil Fertility in the Garden. 

 The soil fertility plots have been running since 1918 under the manage- 

 ment of Mr. Hepler with a view to determining: (1) the minimum amount 

 of manure necessary to obtain profitable vegetable crops on the soil in ques- 

 tion; (2) to what extent green crops and fertilizers can be substituted for 

 manure; (3) a profitable combination of chemical fertilizers and manure; 

 and (4) the effect of lime upon crop production. The plots have been planted 

 in previous years to kidney beans, sweet corn and potatoes. In 1921 they 

 were planted to Danish Ball Head cabbage. The manure was applied early 

 in the season, but the plots were not plowed until June excepting the green 

 manure plots 3 and 7 which were plowed in April and sowed to oats for a 

 green manure crop. The oats made a good growth and covered the plot 

 to a depth of a foot when they were plowed under in June. 



The cabbage was not set until the first week in July, since the soil was 

 too dry up to that time. The width of the plots was reduced to thirty feet 

 so as to lessen the danger of the overlapping of fertilizer treatments. This 

 reduced the size of the plots from 1-8 of an acre to approximately 1-10 of 

 an acre. About the same number of plants was set on each plot and very 

 few failed to grow or were injured by diseases or insects. Only marketable 

 mature heads were harvested and the weight figures given below are for 

 cabbage trimmed for market. 



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 

 fertihzer 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 phosphate; 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. 



