INTENSIVE GRASSLAND MANAGEMENT 



37 



rotations. Early in 1928 all plots except IV received a complete fertilizer and 

 later three additional applications of nitrogen were made during the same sea- 

 son. The fertilizers used were Nitrophoska II and Calurea. Nitrophoska II, 

 a high analysis complete fertilizer containing 16.5 per cent nitrogen, 16.5 per 

 cent phosphoric acid and 20 per cent potash (16.5-16.5-20), was applied at the 

 rate of 334 pounds per acre as soon as it was possible to get on the land in 

 the spring. Calurea, a product containing 34 per cent nitrogen and 13 per 

 cent lime, was applied as a summer top dressing three times during the sea- 

 son at the rate of 30 pounds per acre for each application. The applications 

 of Calurea were made in early June, the middle of July and the latter part 

 of August. 



Fig. 1. The Westfalia Tertilizer Distributor. 



Note eudless chain which feeds the fertilizer from the hopper to the revolving beat- 

 ers for even distribution. 



In 1929, Plot IV again served as a check, and Plot VI received only phos- 

 phoric acid and potash. These were applied in the spring in the form of su- 

 perphosphate at the rate of 258 pounds per acre and muriate of potash at the 

 rate of 100 pounds per acre, thus making the total phosphoric acid and potash 

 on this plot for the season the same as that received by the complete fertil- 

 izer plots. It was felt that the phosphoric acid and potash could be reduced 

 the second year. Therefore, in 1929 the remaining plots received a spring ap- 

 plication of only 250 pounds per acre of the same complete fertilizer, while 

 the summer top dressing of the nitrogen fertilizer was increased to 44 pounds, 

 of Calurea per acre for each of the three applications, which were made at ap- 

 proximately the same dates as in 1928. 



Thus in 1928 a total of 85 pounds of nitrogen, 55 pounds of phosphoric acid 

 and 67 pounds of potash was applied during the season. In 1929 the total 

 application was 85 pounds of nitrogen, 41 pounds of phosphoric acid and 59 

 pounds of potash per acre. To summarize: Plot IV received no fertilizer 

 treatment, Plot VI received a complete fertilizer in 1928 and phosphoric acid 

 and potash only in 1929, and the remaining plots received a complete fertil- 

 izer in both seasons. 



