90 



RESULTS WITH GRASS 



of nitrogen per acre. From 1886 to 1888 no manure was em- 

 ployed. In 1889 manures were applied to the grass at the 

 rate of 60 Ibs. phosphoric acid, 30 Ibs. potash, and 36 Ibs. 

 ammonia per acre. In the years 1890 and 1891, the manur- 

 ing was at the rate of 36 Ibs. phosphoric acid, 36 Ibs. potash, 

 and 36 Ibs. ammonia per acre. In 1892 and 1893 the potash 

 was raised to 72 Ibs. per acre. Throughout the whole of the 

 experiments the same character of manure was maintained on 

 each plot although the quantity varied. 



The average produce of hay per acre in the five seasons 

 in which the grass received manure is shown in Table XXVII. 

 The Hay was in every case the first cutting, the second growth 

 was apparently grazed. 



TABLE XXVII. 



PRODUCE OF HAY BY VARIOUS MANURES AT PUMPHERSTON. 

 AVERAGE OF FIVE YEARS, 1889-93. 



The seasons were generally unfavourable, and the crops of 

 hay obtained were very small. We see, as at Rothamsted, the 

 great effect produced on grass by a manure supplying super- 

 phosphate and potash salt only. A still greater effect is 

 produced by the addition to this manure of a small dressing of 

 sulphate of ammonia. In these experiments we are able to 

 make a tolerable estimate of the return given by the ammonia 

 salt. The hay produced on the plot receiving only phosphates 

 and potash contained but 3 per cent of clover as the average 

 of three years' botanical analyses; we may therefore deduct the 



