I 



442 



Journal of Agricultural Research voi. xxu.no. 8 



centage at maturity is much less, there is the same uniform increment 

 from flowering until maturity. As with the a^vns, the daily increase on 

 plot 8, which received no irrigation after flowering, was less than on the 

 other plots which received one or more irrigations. UnUke the case of 

 the awn, however, the maximum percentage of ash was reached on plots 

 which suffered to a considerable degree from lack of water. The ash 

 content showed a response to irrigation even on plot 7. 



Table V. — Percentage of ash in the paleas of Hannchen barley from variously irrigated 

 plots at Aberdeen, Idaho, in igiy 



No determinations were made which would show the variations in the 

 ash content of the paleas of different varieties. With mature samples, 

 such as those discussed in Table III, it is impossible to strip the paleas 

 from the kernels. For the same reason the analyses of the kernels in 

 Table III are not particularly valuable. The ash content of the caryopsis 

 is much lower than that of the inclosing glumes, so that any variations 

 in the ash of the glumes, or in the proportion of caryopsis to glumes, 

 appear in the table as a difference of the ash content of the kernels. 



ASH IN THE KERNELS 



In the previous papers pubUshed on kernel development,^ the ash in 

 the kernel was computed as a percentage of the dry matter. In the case 



• Harlan, Harry V. daily developmsnt op kernels op hannchen barley from flowering to 

 MATURITY AT ABERDEEN, mAHO. In Jour. Agr. Research, v. 19, no. 9, p. 393-430, 17 fig., pi. 83-91. 19J0. 

 Literature cited, p. 429. 



Harlan, Harry V., and Anthony, Stephen, op. ax. 



