44 



N. H. AGR. EXPERIMENT STATION. 



[Bulletin 142 



Table VI. — Effect of Nitrogen and Phos2)hori(S. Yield of Hay 

 per Acre and Potash Absorbed by Crop, 1908. 



Plot. 



1 



2 

 3 

 5 

 6 



8 

 9 

 25 

 26 

 27 

 29 

 30 

 32 

 33 



Fertilizer. 



Yield. 



Per cent. 

 I Potash. 



30 lbs. nitrogen per A. in Nitrate Soda 



None 



30 lbs. nitrogen per A. in Sulfate Ammonia. . 



None 



30 lbs. phosphoric acid per A. in Acid Phos- 

 phate 



None 



30 lbs. phosphoric acid in Slag Phosphate... 



60 lbs. nitrogen in Nitrate Soda 



None 



60 lbs. nitrogen in Sulfate Ammonia 



None ' 



60 lbs. phosphoric acid in Acid Phosphate... 



None ■ 



60 lbs. phosphoric acid in Slag Phosphate — 



Potash 

 Absorbed. 



84.62 

 58.21 

 69.53 

 60.45 



57.53 

 89.14 

 39.89 

 88.17 

 72.62 

 99.26 

 115.36 

 74.01 

 93.62 

 95.30 



Table VII. — Effect of Chemicals in Combination. Yield of Hay 

 per Acre and Potash Absorbed by Crop, 1908. 



Plot. 



Fertilizer. 



Yield. 



Per cent. 

 Potash. 



41 



42 



43 



44 



45 

 46 



47 



None 



30 lbs. nitrogen, 30 lbs. phosphoric acid 



per A 



30 lbs. nitrogen, 80 lbs. potash per A 



None 



30 lbs. phosphoric acid, 30 lbs. potash per A. 

 20 lbs. nitrogen, 20 lbs. phosphoric acid, 20 



Ib.s. potash 



None 



6,848 lbs. 



6,264 " 



6.900 " 



6,228 " 



5.720 " 



5.538 " 



5,174 " 



1.79 



1.72 

 2.09 

 2.06 

 1.84 

 1.81 



1.86 



Potash 

 Absorbed. 



104.67 



107.74 

 146.01 

 128.29 

 105.25 

 100.24 



96.23 



These plats numbered forty-seven in all, and included sixteen 

 that were unfertilized. Yields varied from a little less than one 

 ton up to three and one half tons per acre. 



These variations were due more to soil conditions than to 

 fertilizers, since on the unfertilized plats the yields ranged from 

 2,316 pounds to 6,374 pounds. The relation between yields of 

 hay and the removal of potash was compared on the unfertilized 

 plats. The comparisons show clearly that as yields increased the 

 potash was ab.sorbed proportionally. 



