10 Maech^ 19Jlt. ] Wheat Variety and Manurial Trials. 



161 



Ciieck plots, on which no manure was applied, are also provided, as 

 is the case at the other centres, so that the usual balance-sheet, in which 

 the net profit per acre per annum that has resulted as the direct effect of 

 using each manure, and after deducting the cost of the application, is 

 available. 



The plots are sown each j-ear on well-prepared fallow, with 60 lbs. 

 of Federation wheat, and manures according to the following list: — 



Results fob 1918, and the Average, 1912-1918. 



(1) No mamire 



(2) l' cwt. siiperphosphittf 



(3) 1 cwt. superphosphate 



(4) 1^ cwt. superphospliate 



(5) ^ cwt. superphosphate an<l J- cwt. basic slag 



(6) 1 cwt. basic slag 



(7) 1 cwt. superphosphate, 10 cwt. lime 



(8) 1 cwt. superphosphate, 40 lbs. nitrate of soda 



(9) 1 cwt. superphosphate, 40 lbs. nitrate of soda, and 40 



lbs. sulphate of potash 



Average Yield 

 per acre. 



13-6 

 20-1 

 21-7 



22-8 

 21-5 

 19-8 

 21-5 

 20-7 



Here, as in the case of Longerenong, the striking response of the 

 soils to phosphatic fertilizers, and to them alone, will be noticed. No 

 combination of other manures with superphosiphate has increased the 

 yield; indeed, some have actually depres.sed it. Of the phosphatic 

 manures the water soluble type, i.e., superphosphate, stands unbeaten. 



Steadily increasing yields resulted with each increase in the amount 

 of superphosphate up to the highest amount tried, viz., 1^ cwt. 



The attached balance-sheet shows whether it has been profita<ble to 

 make these increases: — 



COMPARISOX OF [JiTeT PrOFIT PER AcRE OBTAINED BY THE USE OF LiGHT 



AND Heavy Dressings of Phosphates. 

 Average Results for the Seven Years 1912-19. 



The table demonstrates that an application of ^ cwt. of superphos- 

 phate per acre has resulted in a net profit of 23s. 6d. per acre per 

 annum. The addition of another i cwt. resulted in an extra Ss. lid. 

 2197.— 2 



