LEGlMlNOt'S FORAGE CROl'S 217 



Seed: length of largest diameter ; second largest diameter 



Seed: orange; yellowish-brown; dark olive-green; black; yellow; reddish; 

 red; green; yellowish-green. 



Hilum: round; oval; elongated. 



Radicle: more than half the edge; half the edge; less than half the edge. 



Radicle: tip prominent; tip not prominent. 



256. FOR THE IDENTIFICATION OF THE SEEDS OF CLOVERS AND THEIR COM- 

 MON IMPURITIES AND ADULTERANTS. This practicum should be preceded by 

 the practicum on the fruits of leguminous forage plants. Give each student 

 two grams of clover seeds and impurities mixed in definite proportions. 

 The following is suggested as satisfactory: red clover 60 per cent.; alsike 

 clover 20 per cent.; white clover 10 per cent.; black medic, sweet clover, 

 and timothy, 2 per cent, each; and 0.5 per cent, each of lady's thumb 

 (Polygonum pcrsicaria L.), Rugel's broad plantain (Plantago rugelii D. C.), 

 narrow plantain (Plantago lanceolata L.), sorrel (Rinnc.r acctosella L.), 

 curled dock (Rumc.v crispits L.), yellow foxtail (Chactochloa glauca (L.) 

 Scribn.), ragweed (Ambrosia art emisiac folia L.) and witch grass (Panicum 

 capillare L.). 



The student should be required to separate these seeds and, if practicable, 

 as a check on the accuracy of his work, to obtain the weight of each. Named 

 samples of the seeds of each may then be examined by the student and his 

 own sample named therefrom. Mounted specimens of each plant should also 

 be on exhibition. If students are not supplied with hand lens, samples 

 mounted under a good reading glass or similar microscope may be provided. 



257. FOR THE IDENTIFICATION OF ALFALFA SEED AND ITS COMMON IM- 

 PURITIES AND ADULTERANTS. This practicum should be preceded by the prac- 

 ticum on the fruits of leguminous forage plants. Give each student two 

 grams of alfalfa seed mixed with definite proportions of other seeds. The 

 following is suggested as satisfactory: alfalfa 50 per cent.; black medic 40 

 per cent.; sweet clover, bur clover, 2 per cent, each; and 1 per cent, each 

 of field or large seeded dodder, clover or small seeded dodder, lamb's quarters, 

 green foxtail, wild mustard, and dandelion. The practicum may be conducted 

 as in 256. 



258. FIELD STUDY OF ALFALFA. The following is suggested as a possible 

 practicum at any institution where experiments in alfalfa are being conducted, 

 the outline to be changed to suit conditions: 



I. (a) Observe stand and presence of weeds on 3-year seeding. 



(b) Observe stand and presence of weeds on 5 -year seeding. 



(c) Observe stand and presence of weeds on 6-year seeding. 



(d) Note the nature and habit of dodder. 



(e) What is the effect of its presence in the field? 



(f) How does alfalfa renew its growth? 



II. Observe the stand, degree of browsing, and presence of weeds on the 

 experiment pasture. 



