536 EXPERIMENT STATION RECOED, f Vol. 35 



extending over a period of 17 years with 10 different varieties showed that 

 8 pk. per acre proved most profitable, the use of 9 pk. standing second, and of 

 6 pk. third. 



No important differences in yield were found in comparing heavy kernels 

 of seed wheat with light kernels with such variations in weight as can be 

 secured with the ordinary fanning mill. With hand-selected seed of pure line 

 strains with variations in weight of 100 per cent or more, important increases 

 in yield were obtained from the heavy kernels. 



Of the varieties tested for 18 years the following, mentioned in decreasing 

 order of yield, gave the best results : Dawson Golden Chaff, Nigger, Poole, 

 Gipsy, Valley, Harvest King, Mealy, Gold Coin, Hickman, and Nixon. Daw- 

 son Golden Chaff, Mealy, and Gold Coin are reported as of inferior milling and 

 baking quality. Variety tests conducted the last eight years and including five 

 of the newer varieties not in the trial above mentioned showed Portage, Dawson 

 Golden Chaff', Gold Coin, Gladden, Trumbull, Early Red Clawson, Harvest 

 King, Red Wave, Hickman, and Poole, given in decreasing order, to have been 

 the highest yielders. New varieties recommended to be seeded at the rate of 

 1 pk. per acre were found to require as heavy seeding as the old standard 

 varieties. 



In following the pure line method of selection decided dift"erences in winter 

 resistance, stiffness of straw, yield of grain, and breadmaking qualities are 

 reported to have been found in the progeny of individual heads selected from 

 ordinary varieties of wheat. 



Some lessons from the wheat crop of 1915, C. E. Thoene (AIo. Bui. Ohio 

 Sta., 1 {1916), No. 7, pp. 215-211). — Land growing wheat continuously without 

 fertilization since 1894 yielded 10 bu. per acre in 1915, this being the largest 

 yield in 12 years. The average production without fertilizers for the 22 

 years was raised to 7.5 bu. per acre. An annual dressing of 5 tons of barnyard 

 manure per acre increased the yield to 23.8 bu. for 1915, and to 18 bu. for the 

 22 years, and 430 lbs. of complete fertilizer raised the yields to 22.6 bu. and 

 19.3 bu., respectively. 



Wheat without fertilizer treatment grown in a 3-year rotation with corn 

 and clover since 1898 yielded 17.3 bu. in 1915, and an average of 11.9 bu. 

 for the 18 years. Where only the corn in this 3-year rotation received 8 tons 

 of barnyard manure per acre, the yield of wheat in 1915 was 24 bu., the 18-year 

 average being 20.7 bu. Manure applied at this rate but dusted with 40 lbs. 

 of acid phosphate per ton gave a yield of 29.8 bu. per acre in 1915 and an 

 average of 26.6 bu. for the 18 years. 



In another 3-year rotation including clover and begun in 1894, wheat fol- 

 lowed potatoes. In this test the unfertilized wheat yielded 33.7 bu. per acre 

 in 1915, and averaged 26 bu. for the 21 years. Where both potatoes and wheat 

 received 160 lbs. of acid phosphate on each crop, the wheat yield rose to 39 

 bu. in 1915 with an average of 35.4 bu. for the entire period. The addition to 

 the acid phosphate of 100 lbs. of muriate of potash each for potatoes and 

 wheat increased the yield to 40.7 bu. in 1915 and to 33.6 bu. for the entire 

 period. A further addition of nitrate of soda, 80 lbs. per acre on potatoes 

 and 160 lbs. on wheat, raised the wheat yield for 1915 to 43.2 bu. and for the 

 21 years to 37.7 bu. This was the same fertilizer application that raised the 

 continuously grown wheat from 7.5 to 19.3 bu. 



In a 5-year rotation with corn, oats, clover, and timothy, wheat without 

 fertilizer treatment yielded 8.7 bu. per acre in 1915 and 10.6 bu. as the 22-year 

 average on land that had never been limed, as compared with 15 bu. for 1915 

 and 11.7 bu. for the 22 years on land which had received a ton of quicklime 

 per acre in 1903 and 2 tons of ground limestone 10 years later. Acid phosphate 



