42 



Agricultural Gazette of N.S.W. 



[Jan. 2, 1920. 



The six plots used in the manurial trials at Batlow were sown with 

 Coronation and comprised five manured plots and one unmanured. 



Results of Manurial Trials at Batlow. 



Manure and Cost per Acre. 



P7, 3 cwt. (25s.) 



P5, 2icwt. (21s.) 



Superphosphate, 3 cwt. (18s.) 

 Basic superphosphate, 3 cwt. (21s.) 

 No manure 

 Superphosphate, 2 cwt. (12s.) 



It will be noted that the application of 3 cwt. of P7 gave an increase of 

 26 cwt. per acre against the unmanured plot, and at the ruling market rates 

 for potatoes showed a profit of £21 per acre. This is a repetition of the 

 1917-18 success of this mixture, when it increased the yield by 23 cwt. per 

 acre. The P5 mixture has invariably proved effective at Batlow, and on this 

 occasion caused an increase of 21 cwt. per acre. It is very evident that 

 the use of artificial manures can be expected to prove highly profitable in 

 this district. Manui-ial trials have been in progress since 1912, and upon 

 each occasion the manured plots have yielded much more heavily than the 

 unmanured. 



Spacing Trial at Batlow. 



The results of the spacing experiment — designed to determine the most 

 profitable spacing between the sets in the drills — are this year in direct con- 

 tradiction to those of past seasons. It will be seen that the 21 -inch space 

 gave the highest yield; in previous experiments the 12-inch and 15-inch 

 spacings proved most profitable, and this year's figures are somewhat difficult 

 of explanation. The most obvious reason for the above mentioned variation 

 is that in a dry season like the past the additional root room afforded by the 

 wider spacing might prove beneficial. Apart from this consideration, wide 

 spacing is never to be recommended on account of the pronounced tendency 

 to coar.senes-s that is usually invited by it. 



•" I HAVE found your Poultry Notes very helpful from time to tune. " — A 

 Marrickville correspondent. 



