CONTRIBUTIONS FROM THE WISLEY LABORATORY. 95 



The quantity of manganese sulphate added was 150 grams on each 

 plot to which it was applied (= 70 lb. to the acre which Messrs. 

 Pickles suggested as a maximum dressing), of peat 11 lb., and of lime 

 11 lb. 



The seed was sown on May 26, 1914 ; the plants were thinned on 

 June 24; and the crop was lifted and weighed on July 29, with the 

 following results : 



Table I. 









I 



No. of 

 plants. 



1 



Total and ; 



Total and , 



Total and 





Plot. 



... . 







d V CI. "gvi 









weight. 



ivt. of tops. 



wt of roots. 















lb. 



10. \ 



lb. 





I. 



Nothing . 



263 



123-5 



■ 4 8 



81-5 



■32 



42 

 ■16 





III. 



Manganese sulphate 











H 





and peat 



207 



134 



89-75 



44*25 











.64 



•43 



•■2J 



£ 1 



<y 



IV. 



Manganese sulphate . 



221 



122 



78 



44 



CO 



V. 



Manganese sulphate 





•55 



•35 



■20 







and lime 



222 



126-5 



86 



40-5 



\ 









•56 



•37 



•2# 





VI. 



Nothing . 



239 



128 

 •53 



8i-5 

 •34 



46-5 

 •JO 





VIII. 



Manganese sulphate 















and peat 



197 



118-25 



79-25 



39 



w 



<u ' 









•60 



-40 



•JQ 



V \ 



V 



IX. 



Manganese sulphate 



204 



105 



70-25 



34*75 



CO 



X. 



Manganese sulphate 





'5i 



•34 



•J7 







and lime 



212 



106-5 



75'75 



3o-75 











•5i 



•37 



•15 





XI. 



Nothing . 



186 



75'5 

 -41 



5375 

 •27 



21-75 

 •14 





XIII. 



Manganese sulphate 











CO 





and peat 



185 



90 



61 



29 



« 









■49 



•33 



! -j6 





XIV. 



Manganese sulphate . 



20I 



89 



63 



26 



CO 



XV. 



Manganese sulphate 





■44 



•3i 









and lime 



214 



84-75 

 •39 



59*75 



■ 2J 



25 



•J2 



Owing to losses of plants from various causes, there was some 

 variation in the number of plants harvested, and to bring the figures 

 more into line the average weight of plants, foliage, and roots is given 

 in italics under the gross weight from the plot in the foregoing table. 



In each set of plots the plot to which nothing was added gave a 

 lower yield than that to which manganese sulphate and peat were 

 added ; in two out of the three cases manganese sulphate alone increased 

 the yield, while the addition of lime to the manganese sulphate depressed 

 the yield of roots again. 



We may add the yields of three plots having similar treatment 

 together, and the result is set out in Table II. 



