934 



EXPEETMENT STATION RECOED. 



7). — The first rejMirt on this work, in which the experiments were described, has 

 been previonsly noted (E. S. K., 17, p. 4(>1). 



In 1900 the fertilizer treatment was tlie sluue as in 1904 and 1905, with the 

 exception that on one plat the quantity of nitrate of soda given was doubled 

 and on another 640 lbs. oi nitrate of soda was applied per acre instead of 100 

 lbs. of " niterlime." 



Eight plats without fertilizer in 1900 gave an average yield of timothy hay of 

 3,365 lbs. per acre, 3 plats receiving only mineral fertilizers, 5,133 lbs., 7 plats 

 receiving nitrate of soda with or without mineral fertilizers, 6,451 lbs., and 2 

 plats receiving nitrogen in stable manure, 5,885 lbs. The plat which X'eceived 20 

 tons of barnyard manure per acre in the fall of 1903, without a later applica- 

 tion of any kind, yielded in 1906 7,420 lbs. per acre, as compared with 2,410 lbs. 

 on the check plats. Six plats receiving a complete commercial fertilizer in 

 varying amounts and proportions yielded at the rate of 7,057 lbs. per acre, 

 while 4 unfertilized plats yielded at the rate of 3,192 lbs. 



The relative influence of the different fertilizers is shown in the following 

 table : 



Results secured iritli. different nietliods of fertilizer treatment. 



Num- 

 ber of 

 plats. 



Fertilizer treatment. 



Apparent increase 

 In yield of hay 

 per acre. 



1905. 



Average 



of 2 



years. 



Nitrogen 



Phosphorus 



Potassium 



Nitrogen and phosphorus 



Nitrogen and potiissium 



Phosphorus and imtassium 



Nitrogen, jihusphoriis, and potassium 

 Manure, lU and 211 tuns 



Lbs. 



1,216 



607 



954 



1,573 



1,900 



510 



2,613 



3,310 



Lbs. 

 1,723 

 417 

 1,224 

 2, 126 

 2, 470 

 1,780 

 3,543 

 3,475 



Lbs. 

 1,470 

 512 

 1,089 

 1,850 

 2,185 

 1,145 

 3,078 

 3,393 



Some of the plats receiving a complete fertilizer received, however, larger 

 amounts of the single elements than where only 1 or 2 elements were ajiplied. 

 If the plats on which the quantities of the elements remained the same are con- 

 sidered, the apparent increased yield with nitrogen, phosphorus, and potassium 

 was 2,432 lbs. 



The i*elation of nitrogen to phosphorus on the Dunkirk clay loam in the pro- 

 duction of timothy hay seems to be important, for where in these experiments 

 too lai'ge a proportion of acid phosphate to nitrogen was used there was an 

 apparent depression in yield. An application of 640 lbs. of "iiitrate of soda per 

 acre was too large for the soil and the climate. Aside from the use of stable 

 manure the most satisfactory yield was obtained l>y api dying jier acre 320 lbs. of 

 nitrate of soda, 320 lbs. of acid phosphate, and 80 lbs. of muriate of i)otash. The 

 largest average yield was obtained by the use of stable manure. A single a])pli- 

 c.ition at the rate of 20 tons per acre produced an apparent increase of 11.2 

 bu. of oats in 1904, 4,025 lbs. of hay in 1905, and 5,010 lbs. of hay per acre in 

 1906. When the application was at the rate of 10 tons, the apparent increase 

 per acre was 5.3 bu. in the .yield of oats in 1904, 2,595 lbs. of hay in 1905, and 

 1,937 lbs. of hay in 1906. 



Descriptions and illustrations of the seed of the genus Nicotiana (Sinossi 

 descrittiva ed iconografia dei semi del genere Nicotiana), A. Splendoke 

 (Portlcl: R. Istltuto Hper. Tahaeclil Seafati. J {I!)ii6). itp- ll>-^)- — TIip first 

 volume of this work contains the descriptions of the seeds of the different types 



