consecutive years, a decrease in yield 

 of potatoes of 43 bushels occurred 

 in the fifth year. 



Where 20 pounds of borax were 

 used, the yield decreases occurred 

 in the second year. In the fifth year 

 the decrease in yield amounted to 93 

 bushels. 



Where potatoes are being grown 

 continuously on the same land, care 

 should be exercised in using fertil- 

 izers continuously if borax has been 

 added. 



F. S. Prince 



P. T. Blood 



L. T. Kardos 



To Avoid Scab, Use Extreme Care 

 !n Liming Potato Soils 



In liming experiments with pota- 

 toes at Colebrook, a soil with an 

 initial pH of 4.8 was used. One set 

 of plots was treated with 500 pounds 

 of lime per acre each year while an- 

 olher received no lime. Potatoes were 

 grown each year. 



None of the potatoes were scabby 

 during the first three years while 

 the pH was rising from 4.8 to 5.1. 



However, in the fourth year at a 

 pH of 5.2, approximately 22 per cent 

 of the potatoes on the limed plot 

 were moderately to badly scabbed. 

 When the soil pH reached a value of 

 5.3 in the fifth year, almost 66 per 

 cent of the tubers were affected. 



The unlimed plots in the fifth year 

 had a pH of 4.7 and had no scabby 

 potatoes. There was no significant 

 difference in yields of potatoes on the 

 limed and unlimed plots. 



If the potato grower is following 

 a rotation involving legumes and 

 wishes to obtain a good stand of 

 clover, he should check his soil pH 

 and not use more lime than would 

 raise the soil to a pH of 5.1. For 

 soils with a pH of 4.8 to 5.0, not 

 more than 500 pounds of limestone 

 should be used in any one rotation 

 sequence and it should be applied 

 just prior to seeding down. For soils 

 below pH 4.8, not more than 1000 

 pounds of limestone should be ap- 

 plied during any one rotation se- 

 quence. 



F. S. Prince 



P. T. Blood 



L. T. Kardos 



Dai 



irymg 



Does Method of Preserving Roughage 

 Affect Vitamin Synthesis in the Rumen? 



Three methods of preservation and 

 storage of forage were compared 

 with respect to their effect upon vit- 

 amin synthesis in the digestive tract 

 of cows. Fecal and urinary excre- 

 ions of the vitamins were measured. 

 Whether the roughage was field- 

 cured, mow cured, or ensiled had no 

 significant effect upon the excretion 

 of nicotinic acid or panthothenic 

 acid. The rumen synthesis of thia- 

 mine, however, was favorably affected 

 by the feeding of silage. 

 A. E. Teeri 



D. JOSSELYN 



N, F. CoLovos 

 H. A. Keener 



Fine-Ground Grain Mixture 

 Digested and Utilized Better 

 By Dairy Heifers 



There has been considerable specu- 

 lation among dairymen and feedmen 

 as to the relative feed value of coarse- 

 ground grain for dairy cattle as com- 

 pared to fine-ground grain. Because 

 a coarse grain is more expensive 

 than a fine grain, an experiment was 

 set up to determine whether paying 

 a higher price for the coarse feed 

 is justified from the point of view of 

 digestion and utilization of the pro- 

 tein and energy. 



In eight complete energy and pro- 

 tein balances with four heifers the 

 finely-ground grain mixture excelled 

 the coarsely-ground mixture in both 



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