1282 STARCH CROPS 



>Svalols 3 (d'Eldorado), Jubel, Union, Dunusia, vSvensk Gamda roda, General Cronje, Svalofs 

 72 (de Magnum bonuni), Hoit Jamtlandspotatis, Eldorado, New Guardian, Hassia, Roode Star : 

 Late : Juvel and Bohms Erlolg ; Very Intr : Switez and Svalofs 1 18(>. 



The yield of potatoes was on the average very high: 11.94 tons per 

 acre. Gertrud leads with 18. i tons, after come Lycya, Mossros and Juvel, 

 with 17 ; 16.4 and 16.2 tons respectively. 



In the different groups, the best results were obtained with the follow- 

 ing varieties : 



lyucya 17 ; Midsommar 13.9 ; Harbinger, 11.9. 



Massros 16.3 and Svalofs 2171, with 14.9. 



Gertrud 18 ; Non plus Ultra 15.84 ; The Faktor 15.76 ; Makalos 14. R5 and ITp to date 14.85. 



Juvel 16.25. 



Switez 1 1. 2. 



The proportion of small tubers averages g.i% with a maximum of 20.9 % 

 for Gamba Svenska roda, and after this New Guardian, 19.6 ; Nieuwe 

 Muizen, 17.9 and Boode Star, 17.2 %. The average starch content for the 

 different varieties is shown by the following table : 



Varieties Maximum Minimum .\veraE;e 



Early 15.55 o/^ J2.93 o,;^ jj 5- o,^ 



Fairly early 16.93 i3-oo 1-1-93 



Rather late 17.85 1313 15.23 



I*ate 17.65 16.73 17.19 



Very late 18.55 i7-45 18.00 



The leading position is taken by Switez, with 18.55 % ; next come 

 Roode Star (17.85), Erfold (17.65), Cronje (17.60), Svalofs 1189 (17.45). 

 Non plus Ultra (17.35), Gertrud (17.28) and Makalos (17.03 %). 



The following figures in respect to the connection between the nature 

 of the soil and the starch content are of some interest : 



Varieties 



Early 



Fairly early 13. 



Rather late 



I,ate 



Very late 



The percentage of .starch therefore increases when the humic substance 

 is reduced. The maxinuim yield of starch per acre was obtained with Ger- 

 trud (7 000 lbs) ; after which come Non plus Ultra (6166), Juvel (6080), 

 Makalos (5671) and Wangenheim (5371 lbs per acre). 



It is proposed to continue these comparative exi)eriments for 4 years 

 longer. 



