292 



EXPERIMENT STATION RECORD. 



Here diggiiii*' twice increased the yield by 15.0 kg. per plat. The 

 yield of small potatoes was practically identical, the increase on the 

 plat dng twice occurring almost entirely in the large tubers. 



In a second section of the same Held the potatoes on 1 plat were dug 

 September 23. On another plat 3 fractional harvests were gathered— 

 July 27, August 11, and September 23. The yields of tubers were as 



follows : 



Effect of fractional harvesting on yield of potatoes. 



Digging once. 



Digging 3 times . 



Large Large 

 potatoes, potatoes, 



(big dug 



July 27. Aug. 11. 



Kg. 



Eg. 



22 



Large i Small Total 

 potatoe.s, ' potatoes, | large and 



dug dug small 



Sept. 23. Sept. 23. potatoes. 



Kg. 

 10.4 

 10.4 



Kg. 

 106.4 

 102.0 



Here we have a loss of 4.4 kg. as the result of digging 3 times. 

 Of course the employment of the increased amount of labor required 

 in fractional harvesting would be Justifiable only by a considerable 

 increase in yield or by relatively high prices for the tubers dug early. 



Effect of green manuring on potatoes, H. Clausen {Bent, landic. 

 Presse, 21 {1894), No. 00, p. 0.33).— liye w^as grown with lupines or red 

 clover on plats of 10 square meters, the red clover being sown either 

 at the same time as the rye or after the rye had attained some height. 

 The rye was harvested and the leguminous crops were plowed under 

 (time not stated), and potatoes grown on the plats the following season. 

 The yields of rye and potatoes were as follows : 



Effect of green manures on gield of potatoes. 



Crop in 1892. 



Yield per 



acre 

 of rye in 



1892. 



Yield per 



aci'e of 



potatoes in 



1893. 



Rye alone 



Eye and lupines 



Eye alone 



^ Do 



Eye and late-sown red clover . . 

 Ej-e and early-sown red clover. 



Pounds. 

 828 

 823 

 842 

 861 

 778 

 707 



Pounds. 

 17, 375 

 19, 825 



16. 261 



17, 775 

 19, 825 

 25, 839 



It appears from the table that neither the lupines nor the late-sown 

 clover reduced the yield of rye to any considerable extent. Although 

 the early-sown clover reduced the yield of rye more than that sown 

 late, it was much more effective than the latter in increasing the crop 

 of potatoes the following year. 



Experiments in applying potash salts to sugar beets on rich 

 soils, A. Petermann and G. de Marneffe {Bui Min. Agr. Belgique, 

 10 {ls9i), No. 1, pp. 77-91). — Ln experiments on sugar beets, carried out 

 during 1883-'80 on a sandy argillaceous soil containing in the arable 

 layer 0.078 per cent of potash soluble in hydrochloric acid and 1.89 per 



