W. E. BllENCIILEY AND A. D. HaLL 



213 



3 6 9 12 15 18 'i.\ 24 2 



Fig. 17. Nitrogen in whole plant and in 



' 30 33 36 days 



grain, 1908. 



6 9 12 15 18 21 24 27 30 33 36 days 



Fig. 18. Ash in whole plant and in grain, 1908. 



