The Bulletin. 65 



This mixture is a concentrated one, on account of the high-grade 

 phosphatic and potassic materials used, and will contain : available 

 phosphoric acid, 11.9 per cent; potash, 2.6 per cent; nitrogen, 5.0 per 

 cent (equal to ammonia, 6.0 per cent). 



No. 13— 



Acid phosphate, 14 per cent phosphoric acid 585 pounds 



Cotton seed, 3.1 per cent nitrogen, 1.3 per cent phosphoric 



acid and 1.2 per cent potash 1,375 pounds 



Kainit, 12.5 per cent potash 40 pounds 



2,000 pounds 



This mixture will contain: available phosphoric acid, 5.0 per cent; 

 potash, 1.1 per cent; nitrogen, 2.1 per cent (equal to ammonia, 2.6 per 

 cent). 



Cotton Seed. — Cotton seed may replace the meal in preceding 

 formulas containing meal by allowing 2 pounds of seed for one of 

 meal. 



Nitrate of Soda. — This material is quick-acting, because of its easy 

 solubility in water. For this reason, when used in a considerable 

 quantity in fertilizers at time of planting, especially on light sandy 

 land, there is considerable danger of its being leached beyond the 

 reach of the roots of the plants before they can use it. On clay lands 

 and loams having good subsoils to them this danger does not exist, 

 certainly not to the extent that it does on light soils. A small amount 

 of nitrate of soda in the mixture will give the crop a quick start and 

 make its cultivation easier and more economical. Formula No. 3 has 

 been arranged with this idea in view, and in No. 2 one-half the nitro- 

 gen comes from nitrate of soda. On light lands it would likely be 

 better to omit the nitrate from the mixture and apply it as a top dress- 

 ing, between the 10th and last of June, on early corn. Nitrate of 

 soda may take the place of a portion of the other nitrogen-furnishing 

 materials in any of the formulas, one pound of nitrate being equal in 

 its content of nitrogen to 2.2 pounds of cotton-seed meal, 2 pounds of 

 fish scrap, 1.2 pounds of dried blood. Nitrate of soda is frequently 

 used as a top dressing for corn, and is a very valuable material for 

 use in this way. A good application is 50 to 75 pounds per acre, dis- 

 tributed along the side of the row or dropped beside the plants and 

 three or four inches from them, or else, where there is a ridge in the 

 center, it may be distributed on this, and when it is thrown out the 

 nitrate will be thrown to the two sides of the row. 



Application of Fertilizers to Corn. — On clay lands and loams hav- 

 ing good subsoil the fertilizer should be applied in the drill, at or just 

 before planting, at the rate of 200 to 400 pounds per acre. On light 

 sandy lands it is best to use 50 to 100 pounds in the drill at time of 

 planting, to give the crop a good start, and the balance of the fertilizer 

 as a side dressing when the corn has begun to grow well. 



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