148 EXPERIMEN'T STATION EECORD. [Vol. 41 



ornamental cherry sent out for testing in 1919 from the Minnesota State Fruit- 

 Breeding Farm are described. 



Raspberry culture, R. B. Loeee {Michigan 8ta. Circ. 37 {1910), pp. 16, figs. 

 11). — Practical instructions are given for the culture and care of raspberries, 

 including a descriptive list of varieties. 



The culture of currants and gooseberries, R. E. Loree {Michigan Sta. Circ. 

 38 {1919), pp. 18, figs. 9). — A circular similar to the above on currant and 

 gooseberry culture. 



Almond pollination, W. P. Tufts {California Sta. Bui. 306 {1919), pp. 337- 

 366, figs. 15). — A progress report on a study of the California varieties of al- 

 monds with reference to relative sterility or fertility, and the selection of suit- 

 able cross-pollinizers for commercial varieties. The data given cover observa- 

 tions and pollinating studies conducted by the author and others at the station 

 for several years. 



The results thus far secured indicate that for all practical purposes the 

 cultivated almond is self-sterile, and orchards must be inter-plunted with 

 pollinizing varieties if they are to prove commercially profitable. Certain 

 almond varieties are also Inter-sterile. A list is given of varieties cross-pol- 

 linating satisfactorily. The California at present seems to be the one best 

 pollinizer for all varieties thus far tested which have a coincident period of 

 bloom. With regard to the lengtli of their effective full bloom, the varieties 

 tested are divided into two classes, early bloomers and late bloomers. 



In making recommendations of varieties for inter-planting the author has 

 aimed to keep in mind the date of blooming, abundance of pollen, and, to a 

 limited extent, the productiveness and commercial value of the pollinizer. It is 

 advised that care be taken in the arrangement of varieties in the orchard to 

 facilitate cross-pollination and convenience in harvesting. Also, one colony 

 of bees should be provided for each acre of orchard, singe pollinizing agencies, 

 such as the honeybee, are necessary to the set of a good crop of fruit. 



Fertilizer experiments with rice, bananas, and pineapples, M. O. Johnson 

 {Haivaii Sta. Rpt. 1918, pp. 23-25, pi. 1). — In these experiments dilute solutions 

 of fertilizing salts were applied in the form of sprays to rice, banana, and 

 pineapple plants. Ammonium sulphate was the only treatment to give any 

 noticeable increase of yield of rice. Both ammonium sulphate and potassium 

 sulphate solutions stimulated the growth of bananas. With pineapples, ammo- 

 nium sulphate solution gave good results on manganese soils. Nitrate of lime 

 produced very good results with pineapples on windward Oahu. Inasmuch as 

 only a small amount of fertilizer can be supplied in a single spraying, this 

 method of application does not appear practical except in certain special cases, 

 as on manganese soils where ammonium sulphate can be added to the iron sul- 

 phate solution which is already being extensively used for spraying. 



A small fertilizer experiment with pineapples was started in the fall of 1917, 

 In the Waipio district of Oahu. Several insoluble fertilizers were applied 

 singly and in mixtures directly in the heart of young plants. Up to the pres- 

 ent time, dried blood at the rate of 250 lbs. per acre has given quite striking 

 results. As the result of demonstration experiments conducted at the station 

 this method of top feeding the pineapple with cottonseed meal or dried blood, 

 commonly used in Porto Rico, is now being quite extensively adopted by the 

 Hawaiian growers. 



The iron sulphate spraying treatment developed by the station as a practical 

 means for overcoming the various injurious effects of highly manganiferous 

 soils on pineapples (E. S. R., 36, p. 850) has met with continued success and 

 is being used extensively by commercial planters. In practice it has been ob- 



