356 



Eeport of Potato Trials, 1920. 



[July, 



Unfortunately space will not permit of tables to be shown, to 

 illustrate which of these varieties produce the higher proportion 

 of ware potatoes in the crop. 



Soil Influence. — An attempt has been made to show the 

 effect of soil on the comparative cropping qualities of the many, 

 varieties. 



Table comparing the Average Yields of the Varieties on 

 Light, Medium and Heavy Soils:— 



Light,. Medium. Heavy. 



Per Acre. Per Acre. Per Acre. 





Tons. 



Cwt. 



Tons. 



Cwt. 



Tons. 



(wt. 



Kerr's Pink 



13 



18 



13 



14 



13 



2 



Epicure 



12 



16 



10 



19 



9 



17 



Great Scott 



12 



5 



11 



15 



10 



5 



King George 



11 



11 



11 



15 



10 



4 



Arran Comrade ... 



11 



10 



11 



11 



10 



10 



Nithsdale 



10 



19 



10 



10 



8 



9 



Tinwald Perfection 



10 



8 



9 



13 



8 



18 



Majestic ... 



10 



7 



10 



13 



8 



9 



Ninetyfold 



9 



10 



9 



19 



7 



14 



Duke of York ... 



9 



1 



10 



5 



8 





Golden Wonder... 



8 



11 



8 



17 



7 



11 



Snowdrop 



8 



9 



7 





6 



19 



Arran Rose 



8 



2 



7 



16 



5 



13 



Dargill Early 



8 





7 



18 



6 



10 



Favourite 



6 



4 



5 



11 



5 



6 



Average yield of all varieties 



10 



2 



9 



17 



8 



10 



The best results were obtained on light loamy soils, the varie- 

 ties averaging 10 tons 2 cwt. per acre as compared with 9 tons 

 17 cwt. on medium soil, a drop of only J-ton per acre. Arran 

 Comrade and Duke of York in fact gave a slightly heavier yield, 

 but Epicure gave approximately 2 tons per acre less. 



On heavy soils, the reduction in yield is more marked, the 

 average yield being 8 J tons per acre, or 1 ton 12 cwt. per acre 

 less than on Hght soils. These figures are fairly consisteiit for 

 most varieties, but Epicure appears to be more influenced by the 

 texture of the soil than other kinds. 



Speaking generally, most varieties have given the lowest yields 

 on the heavy soils, while the heaviest aggregates have been 

 obtained on light soils. The exceptions to this are Duke of York, 

 Ni7ietyfold and Golden Wonder which have done best on medium 

 soils. There is often difficulty in making recommendations for 

 heavy soils, but the trials give some information on this point, 

 e.g., Epicure would appear to be the best susceptible early 

 variety and Snoivdrop the best immune; Arran Comrade, Great 



