Field Experiments in Manuring, 1903-4. 



691 



1902-3 Average of 30 fields 



1908-4 Average oi 50 fields (Table A) 



In the first season's returns, the addition of sulphate of ammonia 

 to 2 cwt. of superphosphate appears to have resulted in a further 

 increase in the crop by more than half a ton to the acre, while in the 

 second season the increase, produced by the further addition of 

 nitrogen, amounts to 2-5ths of a ton only. As shown by the figures, 

 there was an additional check on the effect of the nitrogenous 

 fertilizers last season by an application also of an equal quantity of 

 nitrate of soda in place of the sulphate of ammonia. The increased 

 yield from the nitrate of soda is less by practically 1-lOth of a ton 

 than that from the sulphate of ammonia, but the effects of the 

 nitrogenous application, in both cases, are suflficieutly large to direct 

 attention to the requirements of our soils in this iugredient. Reference 

 to the figures of Table A will show that in 47 out of the 50 cases the 

 yields are larger where a phosphatic and nitrogenous combiuation has 

 been used than where a phosphatic only has been applied. The 

 following figures show the comparative yields in 44 cases where the 

 sulphate of ammonia has been used in the combination : — 



Table showing Larger Yields due to Nitrogen Manuring 

 Taken from Table A. 



