Experiments in Keeping Potatoes. 83 



Green Manuring. 



In the spring of 1900, six plots on the Central Experi- 

 mental Farm at Ottawa were sown with corn—two with 

 wheat, two with barley, and two with oats. One plot in 

 each case had common red clover sown with the grain at the 

 rate of 12 lbs. per acre. After the grain was harvested in 

 1900, the clover was allowed to grow until the following 

 season, and was ploughed in about the middle of May, by 

 which time it had made a very heavy growth. Maize was 

 sown soon after and cut in September. It was then found 

 that the maize on the clover plots was taller and more leafy 

 than on the others, while the weight of green fodder on the 

 clover plots varied from 25 \ metric tons to 27 J tons, that on 

 the others from 15* to a little over 20 tons ; the average differ- 

 ence in favour of the green manured plot being 8 J metric 

 tons per acre. 



Similar trials were carried out at the same time with 

 potatoes, the previous operations being exactly the same as 

 in the first experiment. In this case the yield of potatoes 

 on the clover crop varied from 411 to 440 bushels, as com- - 

 pared w T ith 381 to 397 bushels on the others, the average 

 increase being about 33 bushels, or 8 per cent. 



{Report on perimental Farms, Canada, igo/.] 



German Experiments in Keeping Potatoes over 



Winter. 



This work was carried out during the winters 1899- 1900 

 and 1 900- 1 90 1, and it is reported on by Dr. Otto Appel.* 

 Little that is not familiar to our more intelligent potato 

 growers has been discovered, but a short summary of results 

 may be given : — 



The clamps or pits should be placed on fresh ground each 

 year. In this way infection of the tubers with decay-induc- 

 ing* germs is, to some extent, avoided. 



Heavy soil as a covering keeps out frost better than light 

 soil. 



* Afb. aus der Biol. Abth. fur Land u. Forstwirtschaft am Kais. Gesundheitsamte, 



1902. 



F 2 



