6 7 



13. A small dressing of sulphate of ammonia may be 

 applied to autumn sown crops in autumn, but 

 most of it should be put on in spring. For all 

 other crops, it should be used at, or a little before, 

 the time of sowing the seed. If applied late in 

 the growth of the crop, sulphate of ammonia may 

 cause too great rankness. 



14. Sulphate of ammonia may be applied longer before 

 sou ing on heavy land than on light. It is less 

 suitable for very calcareous soils than for either 

 sandy or clay soils, and still less so for soils 

 deficient in lime. 



15. Sulphate of ammonia may leave a valuable residue 

 in the soil after the removal of the crop to which 

 it is applied. 



16. Too large a dressing of sulphate of ammonia causes 

 injury from over-rankness of growth and late 

 maturity, especially if mineral plant food be 

 deficient in the soil. 



17. Sulphate of ammonia should be mixed with dry 

 ashes, sand, &c., for convenience of sowing, or 

 with other manures, except those which contain 

 lime or carbonate of lime, or which are damp. 



1 8. Commercial sulphate of ammonia should be of 95 to 

 97 per cent, purity, containing about 24 to 25 per 

 cent, of ammonia. The chief impurities, apart 

 from sandy matter, are common salt, sulphate of 

 soda, sulphate of iron, arsenic, sulphuric acid, and 

 thiocyanate of ammonia, of which the last three 

 are most injurious. 



19. On wheat, sulphate of ammonia increases the quan- 

 tity of the produce and improves its quality. 

 About i cwt. per acre should be given. 



20. On barley, sulphate of ammonia gives large increase, 

 and on the average produces a better malting 

 sample than other nitrogenous manures. Average 

 dressing, f cwt. to i cwt. per acre. 



21. On oats, sulphate of ammonia usually yields a larger 

 increase of grain than nitrate of soda, and of straw 

 also if potash be plentifully supplied. Average 

 dressing, about i cwt. per acre. 



22. On mangels, when farmyard manure is used, sul- 

 phate of ammonia is probably superior to nitrate 

 of soda in produce per acre of food for stock, and 

 often in weight of crop. Without farmyard 

 manure, it has rather less effect. Average dres- 

 sing, i to 2 cwt. per acre. 



23. On turnips, sulphate of ammonia compares favour- 

 ably with nitrate, giving as large or larger crops, 

 which apparently keep better. Average dressing, 

 about i cwt. per acre. 



