742 



EXPERIMENT STATION RECORD. 



employed, was supplied at the following rate: 7.752, 3.876, 1.938 (nor- 

 mal), 0.969, 0.484, 0.242, 0.121, 0.060 gm. 



In each cylinder 3 grains of barley were planted June 15. Toward 

 the end of June the plants of the first 3 groups (to which an abundance 

 of nitrogen was supplied) were of a darker green color and more vigo- 

 rous growth than those of the other groups. The first 3 groups headed 

 out about a week and a half later than in the other groups. This 

 effect of nitrogen was still more marked as regards the formation of 

 the grain. While the plants provided with a moderate or insufficient 

 amount of nitrogen ripened the beginning of September, the plants of 

 the first 3 groups showed a tendency at the end of August to make a 

 new growth without producing any grain. This of course was not 

 exclusively the direct result of the excess of nitrogen, but was partially 

 due to the retardation of maturity caused by this excess. The plants 

 were harvested September 15. The yields were as follows : 

 Yields of barley receiving different amounts of nitrogen. 



Experiment. 



Amount 



of sodium 



nitrate 



ipplied. 



Group No. 1 

 Group No. 2 

 Group No. 3 

 Group No. 4 

 Group No. 5 

 Group No. 6 

 Group No. 7 

 Group No. 8 



Grams. 



7.752 



3.876 



1.938 



.969 



.484 



.242 



.121 



.060 



Crop produced. 



Grain. 



Grams. 



8.60 

 5.50 

 3.45 

 2.60 

 1.60 



Other 

 above 

 ground 

 parts. 



Grams. 



44.30 



53.00 



50.80 



20.25 



9.80 



6.00 



3.35 



2.85 



Roots. 



Total. 



Grams. 

 12. 10 

 16.30 

 15.70 

 9.20 

 6.20 

 4.10 

 2.80 

 2.25 



lira urn. 

 50.40 

 69.30 

 66.50 

 38.05 

 21.50 

 13. 55 

 8.75 

 6.70 



Length 



Num- 

 ber of 



ofplant. — h 

 heads. 



Cm. 

 47.6 

 55.2 

 63.5 

 69.1 

 69.2 

 59.6 

 44.9 

 38.9 



Weight 

 of 1 



grain. 



Gram. 



0.053 

 .054 

 .048 

 .041 

 .039 



. As regards the weight of the plants and the number of stems with 

 heads the plants in experiment No. 2 gave bests results. 



The percentage by weight of the roots iu the total weight of the crops 

 was as follows: No. 1, 21.4 per cent; No. 2, 23.5 per ceut; No. 3, 23.7 

 per cent; No. 4, 24.2 per cent; No. 5, 28.8 per cent; No. 6, 30.3 per cent; 

 No. 7, 32.2 per cent, and No. 8, 33.5 per cent. It appears, therefore, 

 that the relative development of the roots increased as the conditions 

 of growth in general became less favorable. 



Analyses of the crop gave the following results : 



Dry matter and nitrogen in the crop produced. 



Experiment. 



Group No. 1 . 

 Group No. 2 . 

 Group No. 3 . 

 Group No. 4 . 

 Group No. 5 . 

 Group No. 6 . 

 Group No. 7 . 

 Group No, 8 . 



Dry matter. 



In 

 grain. 



Per ct. 



7.80 

 5.00 

 3.20 

 2.40 

 1.50 



In 

 other 



parts. 



Per ct. 



50.58 



61.89 



58.03 



27.04 



14.66 



9.13 



5.71 



4.66 



Total. 



Per ct. 

 50.58 

 61.89 

 58.03 

 34.84 

 19.66 

 12.33 

 8.11 

 6.16 



Nitrogen. 



In 

 grain. 



Per ct. 



2.00 

 2.09 

 1.85 

 1.50 

 1.46 



In 

 other 

 parts. 



Per ct. 

 2.22 

 1.33 

 .80 

 .43 

 .43 

 .43 

 .50 

 .51 



Ap- 



plied. 



Grams. 

 2.558 

 1.281 

 .643 

 .324 

 .164 

 .085 

 .045 

 .025 



In dry 



matter 



pro- 

 duced. 



(Ira ins. 

 1. 120 

 .820 

 .470 

 .272 

 .168 

 .097 

 .063 

 .044 



Unconsumed. 



Grams. 

 1. 433 

 .461 

 .173 

 .052 



Per ct. 

 56.0 

 36.0 

 26.9 

 16.0 



