691 



Georgia Station, Fourth Annual Report, 1891 (pp. 7). 



This inchules brief statements regarding the changes in organization, 

 new buildings erected, and ex])eriniental work performed during 1891, 

 and a subject list of Bulletins Xos. 10-15 issued during the year. There 

 is also a hnancial statement for the fiscal year ending June 30, 1891, 



Georgia Station, Bulletin No. 16, February, 1892 (pp. 29). 



EXPEROIENTS WITH COTTON, K. J. REDDING (pp. 129-157). — This 



includes experiments with fertilizers and with different methods of cul- 

 ture for cotton, and variety tests. 



Special nitrogen experiment (i)p. 129-135). — This is a repetition on 

 the same 28 fourteenth-acre plats of a special nitrogen experiment witli 

 cotton made in 1890 and reported in Bulletin No. 11 of the station (see 

 Experiment Station Record, vol. ii, p. 553). The tabulated data inchule 

 analyses of the fertilizing ingredients used, the rainfall during 1891 by 

 months, and the yields of cotton at three diiierent pickings. The author 

 summarizes the results as follows : 



1. This is a Aeiy poor soil, being deficiout iu all the elenients of plant food, but 

 especially in phosphoric acid. A moderate dose of jjotash (muriate) proved decidedly 

 injurious instead of beneficial. 



2. Phosphoric acid in combination with jiotash gaAC moderately good results. 



3. Nitrogen in the form of nitrate of soda alone was of no material benelit; in 

 the form of cottou-seed meal it gave a considerable increase, probably partly due to 

 its i)hosphoric acid and potash; as sulphate of ammosia a moderate iii»rease; as dried 

 blood a smaller increase. 



4. Nitrogen iu every form used, Avhen in combination with jihosphoric acid and 

 potash (mixed minerals), gave much the best results and appeared to be the most 

 eilective element. 



5. Nitrogen seemed most eft'ective when applied (1) in tlie form of stable manure, 

 (2) in the form of nitrate of soda, (3) in the form of crushed cotton seed, (4) in the 

 form of cotton-seed meal, (5) in the form of dried blood, (6) as sulphate of ammonia. 



General fertilizer experiment (pp. 133-144:). — An experiment on 102 

 plats, each 69| feet in length and containing three rows 4 feet apart. 

 Eleven jdats remained unfertilized. On the other plats superphosi)hate 

 156, 312, and 468 pounds; muriate of potash, 39, 78, and 117 pounds; 

 and nitrate of soda 65, 130, and 195 pounds were variously combined 

 with each other and Avith 429 pounds of cotton-seed meal per acre. 

 The land had recently been in corn, oats, and peas, and was prepared 

 by turning the i^ea stubble in with a plow. The variety of cotton used 

 was Truitt Imx)roved. The results are tabulated. The author con- 

 cludes that — 



(1) Phosi)horic acid is the most effective in increasing the yield of cotton on this 

 soil. 



(2) Potash was not required except when liberal amounts of pliosjjhoric acid and 

 nitrogen were used, when one dose of potash was moderately eti'ective. The behav- 

 ior of potash (muriate) is uncertain and even erratic, as shown by the absence of 

 uniform results where this element was used in increasing ([uautities. It is not cer- 

 tain that on the whole potash increased the yield of cotton. 



