518 EXPERIMENT STATION BECOED. I Vol. 38 



From these results it is concluded that where a definite rotation is practiced 

 on this type of soil and the land is in a good state of cultivation it does not 

 pay to fertilize corn before planting, but that fertilization may be practicable 

 when the crop is about waist high, using a rapidly available source of nitrogen. 

 The oat crop following the corn should be fertilized with phosphoric acid, and 

 a small amount of nitrate of soda to give it a vigorous start, and top-dressed 

 with either dried blood, sulphate of ammonia, or nitrate of soda during the 

 latter part of February or early in March. Potash is deemed unnecessary. 

 Cotton should be liberally fertilized with a complete fertilizer before planting 

 and top-dressed during its early fruiting stage. 



Relation of phosphorus and nitrogen in soil to the composition of wheat, 

 J. W. Ames and G. E. Boltz (Ohio Sta. Bui. 318 {1911), pp. 01-118, figs. 5).— 

 This bulletin reports in detail the results of studies on the yield, physical 

 properties, protein and phosphorus content, and baking quality of .wheat grown 

 in the 5-year rotation experiments at Wooster, in experiments with floats at 

 Strongsville, and on a number of different kinds of soils Ln other parts of the 

 State. It was found " that the composition of wheat grown on soils which have 

 received the same fertilizer treatment for 20 years is affected by the amounts 

 of phosphorus and nitrogen supplied in fertilizers. 



" Fertilizers supplying phosphorus increased the size of the wheat grain. 

 Plumpness of grain is largely dependent upon the amount of available 

 phosphorus in the soil. 



" The effect of the addition of phosphorus without nitrogen to a soil which 

 is more responsive to phosphorus than to nitrogen fertilization has been an 

 increase in yield but a depression of the protein content of wheat. Where the 

 fertilizer treatment supplied nitrogen with phosphorus the protein content as 

 well as the yield was increased. Wheat grown on soil where the fertilizer 

 treatment included potassium with nitrogen and phosphorus had a lower 

 protein content and produced a larger yield than when the fertilizer treatment 

 included only phosphorus and nitrogen. 



" The highest percentage of protein was found in wheat grown on soil 

 deficient in available phosphorus and well supplied with available nitrogen. 

 Nitrate of soda alone caused the largest increase in protein content of wheat 

 and produced only a slight increase in yield. The proportion of phosphorus to 

 nitrogen supplied by the fertilizer and differences in the availability of the nitro- 

 gen have apparently been factors responsible for variations produced in the pro- 

 tein phosphorus content of wheat grown under these conditions. The protein 

 content of wheat grown on soil where nitrogen was supplied by organic carriers, 

 tankage, and dried l)lood was less than where nitrate of soda was used, the 

 same additions of phosphorus, potassium, and nitrogen being made to the soil 

 in both instances. 



" There was a tendency for the protein in the flour to parallel the increased 

 protein content of wheat where the supply of available nitrogen in the soil 

 was increased. Nitrate of soda depressed the phosphorus content of wheat 

 when applied in combination with phosphorus as well as when used alone. 

 Phosphorus furnished by floats has decreased the protein and increased the 

 phosphorus content of wheat on Strongsville soil. This effect was produced 

 in wheat grown on soil which had received applications of acid phosphate as 

 well as in wheat grown on unfertilized soil, and was most pronounced where 

 nitrogen without phosphorus was applied. 



" The loaf volume of bread obtained in baking tests of flour produced from 

 these wheats varies as the protein content of the wheat and flour. Different 

 varieties of wheat grown on the same soil exhibit wide variations in the 



