June 26. 1916 Mineral Phosphates and Plant Nutrition 



493 



Table III. — Dry matter and phosphorus content of plant products from timothy and 



red-clover hay 



SERIES IE; TIMOTHY HARVESTED ON JULY 21, SEPT. 26, AND NOV. 25, I914 



SERIES IH; RED-CLOVER HAY HARVESTED ON JULY 20, SEPT. 26, DEC. 25, 19 14 



22 

 22 

 66 



66 

 220 

 220 



041 



169 



055 



215 



72- 55 



6-73 



78.29 



9.967 



150.839 



36 



54 



o The phosphorus content of average timothy hay is 0.09 per cent. 



6 Attacked hy worms. 



c The phosphorus content of average red-clover hay is about 0.21 per cent. 



Table IV. — Dry matter and phosphorus content of plant products from, cowpeas and 



soybeans 



SERIES IP; COWPEAS HARVESTED ON JULY 6, I914 



Pot No. 



51- 



52- 



53- 

 54- 

 55- 

 56. 

 57- 

 58. 

 59- 

 60. 



Phos- 

 phate 

 added. 



Gm. 



22 

 22 



66 



66 



220 



220 



Gm. 



o 



<3-3 

 o. 7 

 o 

 1.4 

 o. 7 



11. 7 



12. I 

 12. I 

 14. I 



Straw. 



Gm. 

 2.8 



2. 7 



4-3 



4.9 



7.6 



6.7 



23.8 



27.6 



22.5 



30-9 



Phosphorus 



Grain. 



Per cent. 



a. 29; 



Per cent. 

 0.073 



• °9; 

 .09- 



128 



Mgm. 



3-82 

 55-'o8' 



41.86 



Straw. 



Mgm. 



1.97 



4.66 

 7-37 



27.92 

 39-40 



Total in 



grain and 



straw. 



Mgm. 

 1.97 



4.66 

 II. 19 



62.99 

 81.26 



Percent- 

 age re- 

 moved. 



O. 40 

 ■75 



29 



o Seed planted in each pot contained 0.434 per cent of phosphorus. Fifteen cowpea seeds coataincd 11.7 

 mgm. of phosphorus. 



