Journal of Agriculture. 



[9 Sept., 1907. 



season, the area for 1905-6 being 44,670 acres and 1906-7 55,372 or an 

 increase of 10,702 acres. These fluctuations are brought about by high 

 prices ruling when crops are light, and low prices when yields are heavy. 

 The average per acre for last season was 3.01 tons per acre, the increased 

 yield being 51,487 tons. It would be well for growers to work their 

 potato areas on a rotation plan which would bring about the same quantity 

 of land under potatoes every year, and thus as far as possible avoid a 

 glut in the market. 



A report, dealing particularly with the imported varieties, will appear 

 in the next issue of the Journal. 



The Effects of Manures on Potato Yields — 

 Season 1906-7. 



F. E. Lee, Agricultural Supcriiitoidoii. 



The interest excited by the potato experiments of the previous season 

 brought about an extension of the work during 1906-7. The fields 

 embraced most of the recognised potato growing centres. A slight variation 

 was made in the manurial treatment to meet changing conditions of soil. 

 The returns below are grouped according to similarity in manure 

 dressings : — 



Manurex used. — A. 2 cwt. Superphosphate. B. 2 cwt. Superphosphate, 1 cwt. Nitrate of Soda. 

 D. Same as B, and § cwt. Potash Sulphate. E. 5 cwt. Lime. F. Farm manure. 



C. No manure. 



Disregarding altogether the question of variety, we find that the effect 

 of manuring on the yield of tubers has been as follows : — 



A. B. C. D. E. F. 



Tons per acre ... 2.5 ... 3.1 ... ^.i ... 2.6 ... 1.7 ... 2.2 



These figures confirm pre\ious experimental work in a similar direction 

 and point to the necessity of a supplementary application of nitrogen to 

 the phosphatic manure. The addition of potash has caused a falling off 



