Table 1. - Production and crude protein content of hay, with no fertilizer, 



and with 160 pounds of nitrogen added annually, cut at specified harvest 

 dates, experiment plots, Gunnison, Colo., 1951 and 1952. 



' KOIFERTILIZED 





Yield : 



Percentage : 





■Yield: 



Percentage 



Date 



per : 



of crude : 



: Date 



. per : 



of crude 





: acre : 



protein : 





acre : 



protein 





• Tons 



Percent 



:Hay harvest 1952 



Tons 



Percent 



Hay harvest 1951 







June 12 



1. 15 



11.50 : 



: June 17 



1. 11 



14. 31 



June 25 



1.97 



10.44 : 



: June 30 



2. 03 



13. 13 



July 18 • 



2. 22 



10.38 : 



: July 12 



2. 42 



11. 31 



August 2 



3. 25 



11.75 : 



: July 28 



: 2. 65 



10.44 



August 18 



2. 89 



9. 94 : 



: August 13 



3. 52 



10. 00 



August 27 



3. 19 



9. 19 



: August 22 



2. 87 



8. 75 



L.S. D. (0.05) 







: L. S. D. (0.05) 







between dates - 



. 36 



1. 00 : 



: between dates - 



• . 38 



.94 



L. S. D. (0.01) 







: L. S. D. (0. 01) 







between dates - 



. 47 



1. 31 : 



: between dates - 



. 51 



1. 25 



FERTILIZED 



Hay harvest 1951 



June 12 



June 25 



July 18 



August 2 



August 8 



August 27 



L. S. D. (0.05) 



between dates - 

 L. S. D. (0.01) 



between dates- 



1. 45 



2. 72 



3. 49 



3. 95 



4. 54 



5. 36 



. 36 

 . 47 



16. 88 

 15. 75 



10. 69 



11. 06 

 10. 13 



9. 00 



1. 00 

 1. 31 



Jlay harvest 1952 



: June 17 



June 30 



July 12 



July 28 



August 13 



August 22 



L. S. D. (0. 05) 

 between dates - 

 L. S, D. (0. 01) 

 between dates - 



58 

 76 

 22 

 21 

 72 



5. 28 



38 



51 



21. 06 

 17.44 

 14.94 

 12. 25 

 10. 94 

 9. 25 



.94 



1.00 



See Miller, D. E. , footnote 1, page 5. 



