528 



EXPERIMENT STATION RECORD. 



On the availability to Hvingarian grass of nitrogen in form of 

 nitrate of soda, cotton-seed meal, and ra-w, boiled, and steamed 

 bone, E. H. Jenkins and ^^^ E. Bkitton {('<)/uirrt!riif State St//. Jijjt. 

 1899, j)t. 3,2^P- 201^.-210). — This is a contiimation of experiments of 

 previous years (E. S. R., 10, p. 28-1-). The soil used was a lii^ht sand 

 contaiiiiiig 0.1095 per cent of nitrogen and having- a faintly aeid reac- 

 tion to litmus paper. To the soil of each pot were added 6.(i gm. of 

 freshly slaked lime free from magnesia, l.s gm. of muriate of potash 

 containing 48.54 per cent of potash, and \.'l gm. of dicaleium phos- 

 phate containing 11.5 per cent of phosphoric acid, besidcis the nitrog- 

 enous fertilizers tested. The experiments were conducted as in 

 previous years. The results are summarized in the following table: 



Percentagi's of crop mcrc(if<e and of fertilizer nitrogen recovered in lluiifjariun grass. 



"Inspection of these figures shows tliat from 62 to 79 percent of tlie fei'tilizer 

 nitrogen in form of nitrate of soda and from 38 to 44 per cent of the fertilizer nitrogen 

 in form of cotton-seed meal were available and taken up by the crop. 



"The results where bone nitrogen was applied are very irregular, and much less 

 nitrogen was present in some crops which had grown in pots to which bone Avas 

 added as a fertilizer than in crops from pots which had no fertilizer nitrogen added 

 to them. In no case where bone was used as a fertilizer did more than about 85 per 

 cent of the fertilizer nitrogen become available to the crop. In every case the larger 

 application of bone had a better effect than the smaller one." 



On the availability of the nitrogen of hard ra-w bone as affected 

 by applications of slaked lime, E. H. .Jenkins and AV. E. Bkitton 



{(h/o>crt;r,ft State Sta. A'j>t. IS99, pt. 3, PI). 211-216, 2>l' i).— Exper- 

 iments on this subject, similar to those described above, were made 

 with 3 light sandy loams deficient in available plant food. The 

 pots used were brought to a uniform weight of t^ lbs. b}- putting 

 in gravel, and 14 lbs. of soil containing 15.69 per cent of moisture was 

 placed in each pot. The fertilizers used per pot were 1.8 gm. of 

 muriate of potash, 1.2 gm. of dicaleium phosphate, and 6.4 of fine, 

 hard knuckle bone. Two pots received no lime; two, %.& gm. of lime; 

 iyfOj 13.2 gm.; t\yo, 19.8 gm. ; and two 26.4 gm. of freshly slaked but 



