48 EXPERIMENT STATION" EECOED. 



tion of beds after harvest and strawberry pests. Data based on tlie opinions 

 of some twenty growers are given relative to fertilizers used and varieties 

 adapted for different soil conditions and for early, late, and main crop plantings. 



Fertilizer tests with, red raspberries, J. H. Stahl (Washington Sta., West. 

 Wash. Sta. Mo. Bui., 2 {19U), No. 7, pp. 6-S).— The results of fertilizer tests 

 with red raspberries conducted under the direction of the Puyallup substation 

 during the past three seasons indicate that farm manures are the best fertilizers 

 for rasi^berries, and that manure applied in the fall gives quicker results than 

 when it is applied during the spring. A complete commercial fertilizer appears 

 to be more successful than an incomplete fertilizer. 



[Experiments with citrus seedlings in 1914], B. F. Floyd {Florida Sta. 

 Rpt. 19 U, pp. XXXY-XLV, fig. i).— The author here presents the data for the 

 first season of fertilizer experiments with potted grapefruit seedlings in which 

 the soil used was a field soil with good humus content. The results are com- 

 pared with those obtained in 1913 when the seedlings were grown in pure sand 

 (E. S. R., 31, p. 742). The sand cultures were also repeated on the opposite 

 side of the greenhouse from where the 1913 cultures were conducted. The 

 results from the two seasons' work are compared. The experiment as a whole 

 involves a determination of the effect of varying sources of nitrogen and 

 phosphoric acid upon the growth of the seedlings. The results thus far secured 

 are not considered as conclusive. 



A sui'vey of comparable data shows that in the soil experiments sulphate 

 of ammonia gave the highest average growth among the nitrogenous materials, 

 and that different sources of phosphoric acid showed few differences. In the 

 1913 sand cultures dried blood gave the highest average among the nitrogenous 

 materials and basic slag the highest average among the sources of phosphoric 

 acid. A curve representing the stem lengths of the plants grown in the field 

 soil approaches much nearer a straight line than a curve representing the stem 

 lengths of plants grown in pure sand, thus indicating much less variation from 

 the use of the different fertilizers when used on a good soil than when used 

 on a soil poor in humus and organic matter. 



A comparison of the sand-culture results secured in 1913 and in 1914 shows 

 that, although the individual series are not entirely duplicated, the general 

 averages of the groups containing a common source of nitrogen or phosphoric 

 acid are practically the same, dried blood and basic slag giving the highest 

 average growth. Sulphate of ammonia was lowest in one series and nitrate of 

 soda in the other. Acid phosphate used alone gave the poorest growth, but 

 when lime was used with acid phosphate fully as good gi'owth was obtained 

 as from basic slag. 



Citrus experimental grove, S. E. Collison (Florida Sta. Rpt. 1914, pp. 

 LXXV-LXXVII). — In continuation of previous reports (E. S. R., 31, p. 742) 

 measurements are given showing the average gain in diameter of trees from 

 June, 1909, to June, 1914, growing on vai'ious fertilizer plats in the citrus 

 experimental grove. 



No definite conclusions are drawn from the results thus far secured. 



[Report of the horticulturist], W. H. Laweence (Arizona Sta. Rpt. 19U, 

 pp. 349-351). — ^A brief progress report on the work for the year, including data 

 on a test of processed fabrics as containers of heat for protecting citrus trees 

 from frost. 



In conducting the above test four trees were covered with tents of cotton 

 fabric. The tents were constructed to inclose trees 10 ft. wide and 10 ft. 

 high, exclusive of the trunk. Two of the tents were made of light and two 

 of medium weight fabrics. One of the light weight and one of the medium 



