485 



Tlio results of those expoiimtMits and tliose of Mr. Bartliolomow afjroo in tLl^, 

 that tho hirgor i)art of the dissolved bonc-l)lack liits boon used up in a sintilo yt;ir, 

 and that in the second year after application, Thomas sla<;, Grand Cayman's jihos- 

 phato, and even Soulh Carolina rock (Holivian guano was not included in Mr. Bartliol- 

 omew's tests) have given considerably larger yields than dissolved bone-black. 



Tiie results differ from Mr. Bartholomew's in this: first, that in the first year dis- 

 solved bouo-bhiclc gave a mntdi larger yield than any other ])lios[)hato ; and secondly, 

 in consequence largely of the very snniU total cro])s in 1889, dissolved bone-blacdc 

 ])aid much better than any other phosphate, taking the two years togcdher. 



The last doscribed experiment was repeated in 1880 on the same farm. 

 The land used had been fertilized the previous year with IMapes's potato 

 manure. Part of it had been i)lanted to potatoes and the remainder to 

 buckwheat. In 188!> dissolved bone-black 100 pounds, Grand Cay- 

 man's i)hosphate 23 ])ounds, Thomas slag 117.5 pounds, ground South 

 Carolina rock .34.0 poutuls, Bolivian guano 27.5 ])ouih1s, and i\Iona Is- 

 land phosphate 2.") pounds were each aj)i)lied on one (sixteenth-acre) 

 l)lat; ami two ])lats received no ]>hosphate. 



Corn was ])lanted on all the piats, the yields of which are tabulated. 

 The results indicate a " lack of uniformity in the soil." 



The dissolved-boiie black plat was the only one which produced more sound ears 

 than soft ears. 



The dissolvcd-bone-black plat yielded four times as much cars and twice as much 

 stover as the no-phosphate plats, one and three fourths times as much ears as Thom.as 

 slag or Grand Cayman's phosphate, and nearly twice as much as South Carolin i 

 rock. Bolivian guano and Jloua Island pliospbate made little increase of crop. 



In a one-year experiment' with potatoes on another farm, in whicli 

 the eifect of the above-mentioned phosphates was tested, the land 

 proved to be uneven in fertility, so that '^a close comparison of the 

 crops can not properly be attempted. All the phosphatic applications 

 evidently had some good eU'ect, but the highest yield was from Thomas 

 slag, which in this experiment a])pears to have been almost as readily 

 available a source of i)hosphoric acid as dissolved bone-black itself." 



Two one-year experiments to test the effects of the different phos- 

 phates on corn, were made on different fields about 2 miles apart. 

 Three hundred and twenty pounds of muriate of potash and 200 pounds 

 of sulphate of ammonia per acre were used on all the plats, and each 

 of the phosi)hates was api)licd to one-twentieth-acre plat. One field 

 "showed no marked effect from any phosphate, aiul therefore received 

 no further notice." The results on the other fields are tabulated. 



(1) Bolivian guano and South Carolina rock have produced absolutely no increase, 

 cither in ears or stover, ovei- tl:e nopliosphate plats. 



(••i) Dissolved bone-black has produced the highest yield — more than .'iO per cent 

 I.'U'ger than where no phosphate was applied. 



(:?) Mona Island guano ranks next to dissolved bone-l>lack, while Thomas slag and 

 (irand Cayman's phosphate rank nearly alike and gave not quite half as large an 

 increase over the yield of the no-phosphate plats as dissolved bone-black gave. 



Eastern and Western sweet-corn for seed (p. 2.32). — Notes 

 on Evergreen aud Early Crosby sweet corn grown at the station from 



