FIELD CROPS. 



45 



spring, and that this process appeared to last till shortly before ripen- 

 ing. The intensity of this process of assimilation in diflerent stages of 

 growth Avas very different. Valid general rules for the form and time 

 of nitrogen manuring can not be given with exactness. The weather 

 conditions are a considerable factor in the problem. 



The small amount of nitrogen needed in the fall is supplied by the 

 residue of former applications and by the natural provision in the soil. 

 At the beginning of growth in spring is the most important time for 

 applying nitrogen for rye. 



As to potash, there is a large class of soils on which its ai^plication 

 •would be advisable for rye growing. 



The assimilation of phosphoric acid is distributed quite uniformly 

 over the whole period of vegetation. Eye must accordingly have the 

 power to make a full use of an application of phosphoric acid that 

 becomes gradually soluble. The most suitable time to apply phos- 

 phoric acid to rye seems to be in the fall. 



Trifolium pannonicum {I)eut. landw. Presse, 23 {1896), ]SFo. 21, p. 180, 

 jig^ ^). — The everlasting clover of Pannonia has not yet been culti- 

 vated as a fodder plant. It contains quite a high percentage of albu- 

 minoids. It is rather hairy, and on this account it must be cut at the 

 beginning of bloom to be acceptable to cattle. 



It has a deep, branching root, bearing several, often 20 to 30, upright 

 stalks. It requires a deep soil. The flower heads are yellow, 4 to 8 

 cm. long, and the plant is dependent on insects for its fertilization. 

 This clover has a special value in cold mountainous regions where red 

 clover will not succeed. It stood the winter quite well in the Fiirstenalp 

 at a height of 1,782 meters above the sea. 



A bed of 2 square meters yielded at the first cutting, June 2, 12.3 

 kg. green fodder; at the second cutting, Sept. 28, 8.0 kg., standing 60 

 to 70 cm. high before cutting. 



Air-dry plants cut in bloom contained per 1,000 parts: Nitrogen, 19.6; 

 ash, 102.0; pliosphoric acid, 5.9; potash, 34.9; lime, 20, and magnesia, 

 3.1. Calculated to a water content of 11 per cent the proportion of 

 food constituents is as follows: 



Food constituents of Trifolium pannonicum. 



Cultural experiments with American wheat, Kamm {Beut. landw. 

 Prenfic, 23 {1890), JSo. 24, pp. 20.5, 206, Jitjs. 31).— At Toppelsdorf on 

 November 24, 1894, 5 varieties of American winter wheat were sown 

 for trial at the rate of 80 lbs. per Prussian morgen. Notwithstanding 



