170 



Trials op Potatoes, 1921. 



tons 



cwt. 



tons 



cwt. 



tons 



cwt. 



il 



11 



11 



10 



11 



15 



10 



14 



10 



18 



11 



16 



10 



4 



10 



11 



10 



16 



9 



15 



10 



12 



10 



9 



9 



6 



9 



11 



9 



6 



8 



13 



8 



19 



9 



16 



8 



10 



9 







9 



15 



8 



7 



9 



8 



9 



9 



8 



6 



8 



2 



8 



18 



9 



10 



9 



17 



10 



14 



Table V.— Average Yields of Second Early and late Varieties on light, 

 medium, and heavy soils in England and Wales. 



Yield per acre Yield per acre Yield per acre 

 on Light "oils, on Medium Soils. on Heavy Soils. 



Kerr's Pink 



Lochar 

 Gieat Scot . 

 King George. 

 Majestic 

 Ally 



Early Market 



Arran Comrade 



Tinwald Perfection 



Average yield of all varieties 



If the above results are compared with those obtained in 1920. 

 it at once becomes apparent that climatic conditions affect to 

 some extent the relative productivity of the different soils. In 

 1920 the average rates of yield of all varieties were distinctly in 

 favour of light soils ; the figures being as follows : — 



Average yield of all varieties on light soils : — 10 tons 2 cwt. 

 per acre. 



Average yield of all varieties on medium soils : — 9 tons 17 cwt. 

 per acre. 



Average yield of all varieties on heavy soils : — 8 tons 10 cwt. 

 per acre. 



In 1921, however, the balance was cast in favour of medium 

 and heavy soils, especially the latter. This is probably accounted 

 for by the fact that the heavier soils retain natural moisture to 

 a greater extent and for a longer period than the lighter soils. The 

 latter would quickly dry out, save in special cases where the 

 water table was high. Any rain which did fall would be retained 

 longer by the heavy soils than the light ; this appears to have 

 been the case in Wales where the yields on the heavy soils were 

 higher than in the English counties. 



It is very unsafe on the results of the past season to make any 

 definite suggestion regarding the varieties particularly suitable 

 for heavy soils, though it would appear that " Lochar " may 

 be regarded as coming within that category. 



