326 Keiport of the Horticultural Department of the 



Jenkins and Britton' continued the experiments previously 

 noted and found that, on the coal-ash and peat-moss soil, 1.8 

 grams nitrogen, .56 gram phosphoric acid and 3.03 grams 

 potash per square foot gave as good results as larger amounts. 

 This is equivalent to 1079 lbs. nitrate of soda, 320.4 lbs. dis- 

 solved bone black and 582.8 lbs. muriate of potash per acre. 

 The mixture of coal ashes with 5 per ct. of peat moss gave larger 

 yields than coal ashes alone, but was not equal to mixtures 

 containing 9 to 12 per ct. of moss. None of these mixtures 

 gave as much or as good lettuce as compost soil (sod and manure 

 rotted) with the same amounts of fertilizers. Head lettuce and 

 loose lettuce gave the best results on rich compost soils without 

 either lime or chemical fertilizers. The results on the limed 

 plats were better than on the chemical fertilizer plats. 



In 1900 these authors^ report much better croi>s from compost 

 without chemical fertilizers than from the coal-ash and peat-moss 

 mixtures with such fertilizers. On this artificial soil nitrogen in 

 ground bone gave best results; in cotton-seed meal, poorer 

 results, and in nitrate of soda poorest results. The authors 

 believe that the poor texture of both the coal-ash and peat-moss 

 mixture and the compost make it im}>ossible to produce on them 

 lettuce of the best quality. The character of the compost is 

 not given. 



Stuart,^ in the winter of 1896-7, used chemical fertilizers in 

 growing lettuce on a black loam soil unfertilized for several 

 years and believed to be quite deficient in plant-food. DiiTerent 

 plats were supplied liberally with muriate of potash alone or 

 in combination with either or both dissolved bone black and 

 nitrate of soda. A loose lettuce. Grand Rapids, was grown on 

 all plats. The watering was by sub-irrigation. The muriate 

 alone or with nitrate of soda gave unfavorable results, as in 

 tests of Mavnard and Goessmanu; but the muriate with dis 

 solved bone black gave a marked increase in the crop. The 



'Jenkins and Brittou. Conn. State Exp. Sta. Rept. 1899:224-226. 

 *Coun. State Sla. Kept. 1900:25)8-301. 

 "Stuart, Wm. Ind. Sta. Bui. 66 (Oct., 1897). 



