July 2, 1920.] Agricultural Gazette of N.S.W. 499 



Norih-west Slopes. , 



On the North-west Slopes, particularly in the Inverell district, the compara- 

 tive failure of fertilisers with wheat is well known, and it is not surprising 

 that they have not given any substantial increases in the maize crop. An 

 average decrease of 2| bushels of maize per acre has been obtained by 

 the application of 2 cwt. superphosphate, compared with 1 cwt. of this 

 fertiliser. The addition of potash to superphosphate has also decreased tliP: 

 yields. Not much hope can be given for easily soluble nitrogenous fertilisers 

 here owing to the high summer temperatures and low atmospheric humidity. 

 An average increase of 2|- bushels per acre has been obtained by the 

 application of 1 cwc. superphosphate per acre, and until further tests are 

 made this quantity is recommended for this district. 



Tumut District. 



There is a general impi^ession that fertilisers ai-e not required for maize on 

 the rich land in this district ; but, although the number of tests made so 

 far is small, there is an indication that despite the fertility of the alluvial 

 soils, not only superphosphate but also some easily soluble nitrogenous 

 fertiliser, may be used with profit. Averaging the few tests made to date, 

 there has been a substantial increase of 4 bushels per acre from 2 cwt. 

 superphosphate as compared with the unmanured plots, although only 3 

 bushels increase has been made from the application of the same quantity of 

 P7. The addition of 56 lb. sulphate of ammonia (for which nitrate of soda 

 could probably be substituted) to Superphosphate has given an increase of 

 6 bushels per acre, thvis showing a profit of about 10s. per acre. 



According to the trials made so far then, a fertiliser mixture consisting 

 of 1 to 2 cwt. superphosphate and about ^ cwt. sulphate of ammonia or 

 nitrate of soda can be recommended for this district. 



Fertilisers for Fodder. 



North Coast, 



As already stated, the manuring of maize for ff^idder is an entirely different 

 proposition to that of maize for grain ; this fact is illustrated in the results 

 given hereunder. The results obtained with fertilisers may also be taken as 

 applying also to such other summer fodder crops as sorghum, Sudan grass, 

 and millet until experiments with these have given reason for divergence 

 from this opinion. 



In comparing different quantities of superphosphate, the following results 



have been obtained : — 



1 cwt. Superphosphate 2 ewt. Superphosphate 

 per acre. per acre. 



tons cwt. tons cwt. 



Average of six tests ... 14 19 17 3 



Estimating the value of the green fodder at 15s. per toi', the extra 1 cwt. 

 of superphosphate has returned a profit of 273. 6d. per acre. The addition 

 of 28 lb. sulphate of potash to superphosphate has given an average' 

 increase of nearly \h tons of green fodder, and therefore seems profitabh , 



