218 



EXPERIMENT STATION" EECOED. 



otherwise worked late, nitrogen was not liberated in sufficient quantities to 

 supply the crop with the amount necessary for the maximum growth, and under 

 such conditions a lack of nitrogen has been responsible for the low yields of 

 wheat secured. On the other hand, where the ground was prepared early in the 

 season, sufficient nitx'ogen was liberated to supply the needs of the plant and 

 additional nitrogen in the form of nitrate of soda did not increase the yield." 



The action of liquid manure as a nitrogenous fertilizer, A. Stutzee (Mitt. 

 Deut. Landw. GeselL, 30 {1915), No. 6, pp. 6S-1/0). — Briefly summarizing the 

 results of expeilments by various investigators, the author reaches the con- 

 clusion that liquid manure is a satisfactory nitrogenous fertilizer on heavy 

 and medium soils which have the necessary absorptive capacity for ammonia 

 and potassium carbonate. It, however, is not well suited to light uonacid sandy 

 soils which have little absorbent power for ammonia. In such soils the liquid 

 manure produces a persistent alkaline reaction, which is likely to cause burning 

 of the plants. The best results with liquid manure are obtained on mildly acid 

 humus soils. 



Poultry manures, their treatmjent and use, W. P. Brooks {ilassachusetts 

 ma. arc. 5Jt {1915), pp. J^).—K revision of Circular 36 '(E. S. R., 32, p. 322). 



Imports and exports of fertilizer materials ( U. 8. Dept. Com., Bur. Forei0i 

 and Dom. Com., Ser. 1914-15, No. 6, pp. 455, 456, 458, 47S; Com. Rpts., No. 42 

 {1915), p. 694). — The following table gives a summary for the calendar years 

 1913 and 1914 of imports and exports by the United States of the principal fer- 

 tilizing materials, as reported by the U. S. Department of Commerce : 



Imports and exports {in long tons), of fertilising materials by the United States, 



1913 and 1914. 



Materials. 



1913 



Amount. 



Value. 



1914 



Amount. 



Value. 



Bone dust and bono ash. 



Guano 



Kainit 



Manure salts 



Muriate of potash 



Sulphate of potash 



Nitrate of soda 



Sulphate of ammonia. . . 

 All other substances 



Total imports. 



Phosphate rock, luitreated: 

 High-grade hard rock . . , 



Land pebble , 



All other phosphates 



Total phosphates 



All other fertilizers 



Total exports . 



Tons. 



34,619 



19, 105 

 465,850 

 223,292 

 213,762 



39,538 

 625, 862 



58, 281 



S836, 682 

 538,183 

 2, 207, 018 

 2,150,190 

 7,120,055 

 1,633,114 

 21,630,811 

 3,957,307 

 4,995,690 



Tons. 



36,022 



25,562 

 329, 611 

 168, 426 

 168,509 



36, 264 

 543,715 



74, 121 



1,680,309 



45,069,050 



1,382,230 



473,533 



891,263 



1,712 



4,735,330 



5,255,416 



5,834 



281,806 



681,241 



1,067 



1,366,508 



72, 747 



9, 996, 580 

 1,666,755 



964,114 

 63,554 



1, 439, 255 



11,663,335 



S890, 672 

 762,688 

 1,550,879 

 1,842,649 

 5,740,893 

 1,568,704 

 15, 228, 671 

 4, 475, 603 

 5,055,355 



37,116,114 



2,818,060 



3,948,079 



5,513 



6, 771, 652 

 1,311,227 



8,082,879 



During the fiscal year ended June 30, the imports of calcium cyanamid were 

 approximately 15,000 tons in 1913 and 30,000 in 1914 ; of basic slag 15,000 tons 

 in 1913 and 10,000 in 1914 ; of crude phosphates 24,000 tons in each year ; and of 

 apatite 3,000 and 100 tons, respectively. The potash salts imported contained 

 228,757 tons of actual potash (K2O) in 1913 and 176,354 in 1914. 



