l!>-'0] FIELD CROPS. 137 



1, ami tlu> liighost percentaj,'*' of cotton oimmkmI, up to that date, were obtained 

 from the use of GOO lbs. per acre of an 8 : 3 : 2 fertilizer application. Good results 

 on this soil were securetl also from the use of 200 lbs. per acre of an 8:8:3 

 application. 



The medium clay soil was of a type on which cotton is likely to rust, and 

 cons«iuentiy the use of GOO lbs. of an 8:3:9 application, which furnished the 

 largest quantity of potash, frav(> the hifrhest yield. The application of GOO lbs. 

 j)er acre of an 8:3:6 fertilizer mixture gave the highest yield to October 1, 

 while 600 lbs. per acre of an 8:3:0 application, containing no potash, gave a 

 very poor yield. 



On the sandy soil the highest yield was secured where 600 lbs. per acre of an 

 8:3:6 application was used, but the largest yield to October 1 was obtained 

 where an 8 : 3 : 3 fertilizer was applied at the same rate. 



Application of acid phosphate and Tennessee blue rock pliosphate seemed to 

 hasten the ripening of cotton, while the use of other raw rock phosphates, in- 

 cluding Florida soft, Florida pebble, and Tennessee brown, appeared mainly to 

 have delayed maturity. Lime applied with acid phosphate also seemed to have 

 delayed ripening. 



PvXperiments in top-dressing in 1919 resulted in a very profitable increase in 

 yield from a late application of a mixture of sulphate of ammonia and nitrate of 

 soda. The use of potash with nitrogen in top-dressing did not seem to have 

 retarded maturity but it gave no profit. 



Growing; cotton in Arizona, G. K. Thompson and C. ,T. "Wood (Arisona Sta. 

 Bui. 'JO (1910), pp. 265-215,. figs. 5).— This bulletin is a brief popular treatise 

 on growing cotton in Arizona, including notes on the irrigation of cotton, the 

 value of American Egyptian cotton for the region, and the disadvantages of 

 relying on volunteering or rationing for a cotton crop. 



Darso, M. A. Beeson and A. Daank (Ol-lahnma (?ta. Bnl 127 (1019), pp. 19, 

 flfis. 9). — A description of darso is given, a comparison of the plant with lilack- 

 huil White kafir is presented, cultural methods are described, and results of 

 experiments with the crop are reported. 



Darso, a grain sorghum of unknown origin, is regarded as a probable cross 

 between a saccharin and a nonsaccharin sorghum. It is de.scribed as a leafy, 

 stocky sorghum, red seeded, drought resistant, early maturing, and very uniform 

 in height. Analyses made by tlie station showed that darso contained a higher 

 percentage of total sugars than was found in katir or feterita. The chemical 

 composition of the grain and of the forage proved to be very nearly the same 

 as that of the grain and forage of Blackhull White kafir. 



The results of a single feeding test with hogs, by C. T. Dowell, seemed to 

 Indicate that in feeding value darso is not equal to Blackhull White katir, 

 A digestion experiment with sheep showed that the nutrients from the two 

 plants were about equally digestible. 



In a six-year variety test of grain sorghums darso produced the largest 

 average yield, outyielding Blackhull White kafir by about 3 bu. per acre. 

 Being a dwarf plant the yield of forage was less than that of Blackhull 

 White kafir. It was found also that darso as compared with Blackhull White 

 kafir had the greater capacity to withstand relatively long periods of dry 

 weather. 



Report of oats experiments, 1908-1919, M. Nelson and L. W. OsnoRN 

 (Arkansas Sta. Bui. 165 (1920), pp. 3-32, figs. 2).— This bulletin de.scribes the 

 importance and extent of oats production in Arkansas, and reports largely 

 In tabular form the results of variety and cultural experiments with winter 

 and spring oats at the station and in other parts of the State. The recom- 

 mendations given are based on the experimental data secured. 



I 



