553 



Georgia Station, Bulletin No. 11, January, 1891 (pp. 46). 



Cotton, fertilizer and culture experiments, and variety 

 TESTS, R. J. Keddino (pp. 1-21). 



Special nitrogen experiments (pp. 1-11), — The two experiments re- 

 l)OittHl in this connectio:i are similar in general plan to those made with 

 corn and reported in Bulletin No. 10 of the station (See above). The 

 fertilizers used were the same and used in the same combinations, except 

 that dried blood in one third, two thirds, and full rations was added, 

 and crushed cotton seed was ap[)lied on one plat; but the amount of 

 each single material or mixture used was only a little more than half 

 that used iu the previous experiments. 



Each experiment was made on 28 fourteenths- acre plats. The land 

 occupied by the two experiments was not altogether uniform — that 

 used for one of them being somewhat uneven as regards the quality of 

 the soil. "Peterkin" cotton was planted April 16. "The season was 

 favorable, and a good stand was maintained — one stalk about every IG 

 inches." The results of the experiments are given in three tables, which 

 show the yields per acre of seed cotton and of lint on each plat; the 

 increased yield of lint with the use of mixed minerals, and of nitrogen ; 

 the value of the same, and the cost of the added fertilizer; the profit 

 (or loss) on nitrogen and on mixed minerals; and the total profit. The 

 author does not consider that the results warrant final conclusions. 

 Those of the two experiments are in some instances conflicting, and iu 

 others indicate a lack of uniformity of the soil. 



Notwitlistauding t'le occasional discordance, the experiments are of considerable 

 valne — more, perhaps, to the experimenter than to the farmer. 

 The results indicate — 



(1) That the soil is deficient iu both phosphoric acid and potash, especially in the 

 former on the sandy portion and in the latter on the clayey portion. Neither phos- 

 phoric acid alone nor potash alone gave as good resnlts as when combined with each 

 other. 



(2) That tlie soil also requires nitrogen in some form in order to produce the best 

 yield of cotton. Nitrogen alone produced little or no effect, but very decided effects 

 when mixed with pliosnhoric acid and potash. 



(.3) That the use of stable manure and of cotton-seed, composted with superphos- 

 phate and muriate of potash, is to be .strongly recommended, as far as materials are 

 available, on account of superior economic results. 



(4) That cotton responds promi)tly and profitably to applications of nitrogenous 

 manures, and is not very choice about the source or form of this element, but pre- 

 fers it rather in organic form or in nitrate than in the form of sulphate of ammonia. 



Tnterculttiral fertilizing of cotton (pp. 11-13). — The object and general 

 plan of this experiment were similar to those of the experiment with 

 corn rei)orted in Bulletin No. 10 of the station (See above). Five plats, 

 each containing four rows of cotton 209 feet long, and on " well-improved 

 clayey loam land" were used for the trial. Fertilizers were applie<l at 

 the rate per acre of .iJO i)ounds of superphosi)iiate, 108 ])ouiuls of muri- 

 ate of potash, and 373 i)ouiuls of cotton seed meal. One plat received 



