FIELD CROPS, 429 



coutaining 210 lbs. each of cotton-seed meal and acid phosphate and 90 lbs. of 

 kainit was taken as a unit application and gave a yield per acre of 33,856 lbs. 

 of cane. Where the acid phosphate was donhled 41,530 lbs. was obtained, and 

 where the unit application was doubled, one-half being applied on May 16 and 

 the other half on July 10, 41,984 lbs. of cane was secured. Applying double 

 the unit application on May 16 gave 40,896 lbs., and when cotton-seed meal and 

 acid phosphate were normal and the kainit omitted the yield was 33,920 lbs. 

 Half the unit application gave 33,856 lbs., and four times the unit application 

 45,312 lbs., while the land receiving no fertilizer produced 31,744 lbs. Land on 

 which the nitrogen application was doubled and the, phosphorus and potassium 

 left normal gave 36,032 lbs. 



Land receiving no fertilizer yielded 13,550 lbs. of sweet potatoes per acre, and 

 the best yield on fertilized land, 15,910 lbs., was secured where 150 lbs. each of 

 cotton-seed meal, acid phosphate, and kainit had been given. 



Three tests were made to show the effect of fertilizers on cowpeas, and the best 

 yield, consisting of 1,330 lbs. of peas in the hull and 820 lbs. of hay per acre, was 

 secured where a mixture of 200 lbs. each of acid phosphate and kainit was ap- 

 plied. The use of fertilizers apparently affected the yield of peas more than 

 the yield of hay. Some of the leading hay-producing varieties and their yields 

 per acre were as follows : Wonderful 4,200 lbs., Red Ripper 3,504 lbs.. Iron 3,329 

 lbs., and Clay 3,043 lbs. 



The results of an experiment in which the I'otation of crops and the use of 

 fertilizers were combined showed an increase of 17 per cent in the productive 

 capacity of the soil after 3 years, while land growing cotton continuously showed 

 a reduction in^its productive capacity of 16 per cent. It was further found that 

 the use of fertilizers is necessaxy on this soil for the satisfactory growth of cow- 

 peas in the rotation. 



Annual report of the Hawaii Agricultural Experiment Station for 1906 

 [Field crops], J. G. Smith {Haicaii Sta. Rpt. 1006, pp. 10-15). — Potatoes 

 grown at the station were severe]}' attacked by a form of rot which very much 

 reduced the yield. The crop secured was disposed of as new potatoes at 5 cts. 

 per pound. 



The yield of upland varieties of cotton tested at the station was not specially 

 promising, but Peruvian and Sea Island cotton were for the most part good in 

 quality and gave a large yield. The quality of the Peruvian, however, varied 

 widely, and this is considered as indicating an excellent opportunity for im- 

 provement by selection. 



Experiments have been inaugurated with tobacco at Hamakua. The tobaccos 

 under test are Sumatra, Turkish, Cuban, and various seed-leaf strains from 

 Connecticut, Pennsylvania, and other tobacco-producing States. The experiment 

 was not quite complete when the report was made, but the results are regarded 

 as indicating that tobacco of good burn, texture, flavor, and color can be pro- 

 duced on a commercial scale in certain districts in Hawaii. 



Through the cooperation of the Bureau of Plant Industry of this Department 

 150 varieties of rice were obtained from different parts of the world for com- 

 parison with local varieties. This work has been undertaken with a view to 

 assist in the restoration of rice growing to its former important position in the 

 islands. 



[Report on field crops], G. H. True (Nevada Sta. Rpt. 1<)06, pp. 27-29).— 

 Plowing up, leveling, and reseeding old alfalfa ground at the station has given 

 good results. Three acres reseeded in 1904, which in previous years had not 

 yielded over 1.5 tons per acre, gave a total yield in 1905 of 7.9 tons. 



The results of the flooding method of irrigating wheat and oats proved more 

 economical than those of the furrow method. White Australian wheat was 



