101 Jamalainen: Trace Elements in Finland 



much lime had been given to the plots, there were no healthy 

 roots at all. Owing to this the yield of limed plots was lower than 

 that of the unlimed ones. The disease was also found to some 

 extent in sample areas fertilized with boron (5 kg H3BO3 per ha). 

 The experiment was continued for three years. The survey of 

 the results (Table 20) and of the liming experiment in 1938-1939 

 (Table 21) indicates that the yields are low for plots which have 

 been limed but not fertilized with boron. Attention should be 

 drawn to the fact that the soil was fairly acid in these experiments 



Table 20: Liming and fertilizing experiments in 1937-1939 on light clay: — 



^H Yields of roots^ Yields of tops* 

 Plots! of 



soil Without With Without With 

 IN 1938 boron H3BO3' boron H3BO,' 



565 100 153 100 146 



eOOOCaCOs 5.97 96 182 85 155 



900 Pkf + 500 Kio — 155 220 121 169 



500 K40 + 750 Nks — 112 164 144 219 



900 Pkf + 750 Nks — 162 231 179 253 



900 Pkf + 500 K40 + 750 Nks 5.20 172 259 185 284 



900 Pkf + 500 K40 + 750 Nks 5.63 160 272 131 300 



+ 6000 CaCOs 



1350 Pkf + 750 K40 + 1125 Nks 5.19 195 286 173 334 



1350 Pkf + 750 K40 + 1125 Nks 5-50 152 289 116 340 



+ 6000 CaCOj 



1 Fertilizing of plots in different years the same as in Table 19. 



' The average yields of three years given as relative numbers, as compared to the yields of O-plots without 

 boron, of which 13 .130 kg per hectare was given to roots and 16.710 kg per hectare to tops. 



• Boric acid was used in the experiment 1937 5 kg per hectare, and in 1938-1939 8 kg per hectare. 



(pH less than 6), even in the limed plots. The soil was evidendy 

 suffering from a lack of boron, for there were many cases of the 

 disease in unlimed plots which had not been treated with boron, 

 though we found relatively not as many cases as in the limed plots 

 where the lime evidently had bound the small amounts of boron 

 available in the soil. It may be mentioned, in this connection, 

 that most of the Finnish fields are either slightly acid or in many 

 cases even very acid and so are in need of ample liming (Tuorila, 

 Terasvuori & Tainio 1939). The experiments show, indeed, 

 that there is considerable lack of boron, at least in many places in 

 eastern Finland. 



