46 LABORATORY MANUAL IN FIELD CROPS 



PRACTICUM NO. 36 

 Object. Examination of Some of the Common Legumes. 



Materials. Field work on growing plants, or material from 

 the agrostology plots. 



Method. Make an examination of the following legumes 

 grown in your section, and report as outlined below. Tabu- 

 late the results in your notebook : White clover, Sweet clover, 

 Redcclover, Alfalfa, Vetch, Peas. 



(Other legumes may be substituted or added.) 



1. Make a sketch of the leaf to show the shape, size, etc. 



2. Root : tap, fibrous, rhizoidous. 



3. Root : long, medium, shallow. 



4. Annual, biennial, perennial. 



5. Foliage : large, scarce, abundant. 



6. Stems : large, small, coarse. 



7. Stems : sweet, bitter, acrid. 

 > 8. Shape of nodules. 



9. Nodules : numerous, scarce, large, small. 



10. Where are the nodules formed, tap, fibrous, feeding 

 roots ? 



STUDIES 



1 . What causes these nodules on legumes ? 



2. Of what advantage are the nodules to the alfalfa ? 



3. The same bacteria will not infect all legumes; what 

 would you advise for inoculation ? 



4. Name the legumes best adapted to the following sections 

 of the United States and tell why: Southeastern, Central, 

 Southern, New England, Atlantic, Pacific Coast. 



5. Name and give the methods for three ways of inocula- 

 tion. 



