Fertilizers for Cereals and Grasses 231 



order to prevent lodging, which affects both the yield and 

 quality of the grain. If in the rotation the timothy hay 

 is omitted, then the fertilization for the corn may be 

 reduced, as on good soils the yard manure, together with 

 the plant-food stored in the surface in the clover sod, will 

 furnish an abundance. 



FERTILIZERS FOR A SINGLE CROP GROWN CONTINUOUSLY 



When it is desirable to grow any one or all of these 

 crops continuously (and this practice may be followed 

 with advantage, particularly when a leguminous catch- 

 crop is seeded with the main crop, which insures a contin- 

 uous occupation of the land and also provides vegetable 

 matter and nitrogen), the fertilization would naturally 

 be somewhat different, and, as a rule, would require more 

 nearly even quantities of the different constituents. For 

 corn, a fertilizer supplying 20 pounds of nitrogen, 40 each 

 of phosphoric acid and potash, would provide for a liberal 

 increase in the yield from year to year. The nitrogen 

 should preferably be in good organic forms, which would 

 decay rapidly enough to supply the needed available nitro- 

 gen during the growing season. The phosphoric acid 

 may be drawn partly from superphosphates and partly 

 from organic compounds, as ground bone and tankage, 

 provided these latter may be secured at as low a price 

 as the superphosphate, and the potash applied in the form 

 of a muriate or kainit. Fertilizers may be applied broad- 

 cast and well harrowed into the soil, or part may be dis- 

 tributed in the row at time of planting. 



If a catch crop were seeded to be used as green-manure, 

 as, for example, crimson clover, the application of nitro- 

 gen may be very materially reduced. This practice has 



