55 2 



VARIOUS FERTILITY FACTORS 



TABLE 114. COMPOSITION OF BARLEY AT DIFFERENT PERIODS OF GROWTH, 



KILOGRAMS PER HECTAR l (roughly, Pounds per Acre) 



(Wilfarth, Romer, and Wimmer) 



DRY MATTER 



NITROGEN 



PHOSPHORUS 



POTASSIUM 



1 The hectar contains 10,000 square meters (the meter being 39.37 inches), 

 or 2.471 acres, and the kilogram contains 2.2046 pounds; so that i pound per acre 

 is equivalent to 1.12 kilograms per hectar. Thus, for practical accuracy, deduct 

 one tenth to convert kilograms per hectar to pounds per acre. 



and afterward decreased to 75 and 65 per cent, respectively, 

 of the maxima. It is noteworthy that the barley crop, which 



