149 



uitrogen per acre can not be used with profit, especiall}' on very poor 

 soils. 



i:>2)ecial phosphoric acid experiments. — Gypsum, dissolved bone-black, 

 acid phosphate, bone meal, floats, and a basal mixture (cotton-seed 

 meal and kainit) were used alone and in various combinations, and com- 

 pared with no manure. Variations in soil seem to have interfered with 

 the success of this experiment, though it seems probable that phosphoric 

 acid in small quantities may be profitably ajtplied to this soil. 



Special potash experiments. — Cottonseed meal and hull ashes, meal 

 phosphate (cotton-seed meal and acid phosphate), kainit, and muriate 

 and sulphate of i)otash were used alone and in various combinations. 

 The conclusion reached was that " potash has not been beneficial to 

 cotton on this soil in any form or quantity." 



Proper depth for applying fertilizers for cotton (pp. 409,470). — The 

 questions considered were: (1) At what depth are fertilizers most avail- 

 able for cotton? (2) Is it best to apply the fertilizing ingredients sep- 

 arately and at different depths ? The experiments reported were un- 

 dertaken merely to obtain suggestions which might be of service in 

 planning future investigations in a more comi)lete way. The results 

 seemed to indicate that a depth of 2 or 3 inches is the best one at which 

 to apply "complete" fertilizers on this soil. 



Tests of varieties of cotton (pp. 471-473). — Tabulated notes are given 

 for 38 varieties, but for reasons stated in the bulletin the tests were 

 inconclusive. 



Distance of planting {\^\). ^13., 'm).—Goiio\i was planted in drills at 

 different distances and the results reported in a table. Incidentally 

 the effect of "toi)ping" the stalks was tested. 



Effect of more than one application of nitrogen for cotton (pp. 474-476). — 

 Various fertilizers containing nitrogen were applied once, twice, or 

 three times during the same season. The results, as stated, indicate 

 that little eff"ect was produced by the second and third applications. 



Field experiments tcith corn (pp. 476-482). — These included experi- 

 ments with fertilizers and tests of varieties. The former were similar 

 to those with cotton, above cited, and to previous experiments with corn 

 reported in Bulletin No. 22, of this station (See Experiment Station 

 Kecord, Vol. 1, p. 72). The results pointed in the same directions as in 

 the case of cotton. Tabulated data are given for twenty varieties of 

 corn. 



Experiments u'ith sorghum, sugar-cane, forage plants, etc. (pp. 483- 

 490). — Brief accounts are given of tests of varieties of sorghum, sugar- 

 cane, mdlo maize, teosinte, serradella, soja bean, pea-nuts, chufas, cow- 

 peas, water-melons, and sundry forage i)lants, as well as of fertilizer 

 experiments with sweet-potatoes and rice. Analyses of samples of 

 sugar cane raised at the station and elsewhere in North Louisiana, are 

 reported. The station intends to conduct experiments in sugar making 

 with a view to the introduction of that industry in North Louisiana. 

 10521— No. 4 2 



