REPORTS OF EXPERIMENTS WITH DIFFERENT TOP-DRESSINGS. 89 



ammonia were rather greener and more laid than those with glue. 

 The ears on the latter looked quite as full as on the former. 

 On the plots with phosphates alone the crop was considerably 

 thinner, and the ears smaller. A piece of the field alongside the 

 experiments was also cut, and from this the average of the un- 

 manured part was taken. 



The crops on the duplicates were put together and folded in 

 sheets, and then all stacked in a stack by themselves. They 

 were thrashed out the first week of October, when the weights 

 of straw and corn were as seen in Table II. 



It was noticed at the time of harvesting that there were bad 

 patches in plots 15 and 17. This seemed to be owing to in- 

 equality in the soil, as the bad patches extended a few yards be- 

 yond the experimental plots. Thus the average of both the glue 

 with dissolved bone-ash, and glue with Bolivian guano, will 

 have been unfairly reduced by perhaps h lb. on the plot of T j 2 

 acre. If this is taken into consideration, it would raise the 

 weight of grain on those two manures 56 lbs. per acre. Then the 

 weights of grain from the plots with glue, and from those with 

 glue and a phosphate together, will be found very nearly equal, 

 and also equal to those from the plots with sulphate of ammonia 

 and sulphate of ammonia with a phosphate. The weights from 

 phosphates alone are considerably inferior, averaging 3 cwt. less 

 uf grain, and are only just equal with the unmanured portion. 



The weight of straw seems to have been increased most by a 

 nitrogenous manure in combination with a phosphate, for it is 

 less with glue alone than with glue together with a phosphate. 

 It is the case with sulphate of ammonia. The dissolved copro- 

 lites with sulphate ammonia, and dissolved bones with sulphate 

 ammonia, have increased the straw more than any of the others, 

 and have also given a good weight of grain. 



It would thus appear on the whole that sulphate of ammonia 

 has increased the grain about the same as the glue, but has in- 

 creased the straw considerably more. This is probably owing to 

 the sulphate ammonia being immediately available, and thus 

 stimulating the early growth of the plant, while the glue required 

 some short time before becoming available, and then at the time 

 the ear was filling was equally efficacious with the sulphate 

 ammonia. 



The phosphates alone seem to have had no effect on the grain, 

 and only a very slight effect on the straw. In combination with 

 either glue or sulphate ammonia, they have not increased the 

 grain at all, but have increased the straw. The extremely small 

 effect of all the phosphates may to some extent be owing to their 

 only having been applied as a top-dressing, and not harrowed in. 



From these results it is evident that nitrogenous manures have 

 been far the most profitable in their effect on the wheat crop. 



