if corn followed sod or a legume, or after root crops, especially after 

 potatoes. Wheat should not follow oats, rye, buckwheat or barley; it 

 does, however, do well after flax if the flax was grown on new ground. 



A splendid rotation for the northern half of the United States is, first 

 year, a legume (clover, soy beans, cow peas or vetch) ; second year, corn, 

 well manured, and third year, wheat, seeding to clover. In the cotton 

 section of the south, a splendid rotation is, corn, planting cow peas 

 between the rows after the last cultivation. After corn has been har- 

 vested, disc thoroughly before plowing and sow wheat. After the wheat 

 has been cut, drill in peas, unless the ground is too hard, in which event 

 disc or plow very shallow. After the peas have attained a good growth 

 in the fall, plow deep after discing and plant to cotton in the spring. 

 The ground can be further enriched by adding barnyard manure. 



If the soil is deficient in phosphoric acid, apply acid phosphate several 

 days before planting and disc it into the seed-bed very thoroughly. 



The results of rotation in Minnesota have been remarkable. Dond- 

 linger makes the following statement: "Results already reached war- 

 rant the statement that the average yield per acre of wheat can be 

 increased twenty-five to fifty per cent by rotating the crops and manure 

 ing." He also calls attention to the necessity of having a deep, well- 

 made seed-bed. 



Fertility 



Like corn, wheat is greedy and exacting. Wheat roots will not tol- 

 erate a poorly-made home, nor will they thrive on short rations. If the 

 seed is inferior and the seed-bed shallow and not thoroughly ventilated, 

 atmospheric and water elements are not fully utilized. 



Of all the plant food required to make a crop of wheat, ninety-seven 

 and six-tenths per cent of the dry substances of the crop is composed of 

 nitrogen, carbon, oxygen and hydrogen, elements taken from the atmo- 

 sphere and water. The other inorganic elements amounting to two and 

 four-tenths per cent are taken from the soil. Both groups of elements 

 are inter-dependent; hence, while the small per cent which consists of 

 potash, phosphorus, silica, lime, magnesia, soda and sulphur, seems 

 insignificant, the elements must be in the soil in an available form if a 

 crop of wheat is made. 



King says: "The crop of wheat which yields thirty bushels of grain 

 per acre demands, as indicated by chemical analysis, forty-eight pounds 

 of nitrogen, twenty-one and one-tenth pounds of phosphoric acid (which 

 amount to ten and five-tenths pounds of phosphorus), twenty-eight and 

 eight-tenths pounds of potash, nine and two-tenths pounds of lime, 

 seven and one- tenth pounds of magnesia, seven and eight-tenths pounds 

 of sulphur, and ninety-six and nine-tenths pounds of silica." 



Dondlinger makes the following statement in his "Book of Wheat": 

 "An acre of very fertile soil contains about 70,000 pounds, or two per 



