220 



PHYSIOLOGICAL PRE-DETERMINATION : THE 

 INFLUENCE OF THE PHYSIOLOGICAL CONDI- 

 TION OF THE SEED UPON THE COUPvSE OF 

 SUBSEQUENT GPvOWTH AND UPON THE YIELD. 



IV. REVIEW OF LITERATURE. CHAPTER III. 



By FKANKLIN KIDD, M.A. (Cantab.), D.Sc. (T.oxd.), 

 FeUoiv of St Johifi's College, Cambridge, 



AND 



CYRIL WEST, A.R.C.Sc, D.Sc. (Lond.), F.L.S. 

 (Imperial College of Science and Technology). 



PAGE 



Chapter III. The Effect of Conditions during Germination and 

 in the Early SeedUng Stage upon Subsequent 

 Growth and final Yield 220 



Introduction ......... 220 



Treatments of the Seed Affecting the Nutrition of the Seedling: 

 (a) Removal or Partial Removal of the Cotyledons, 



Endosperm, etc. ...... 222 



(6) Soaking the Seed in Water .... 234 



(c) Seed Impregnation with Nutrient Salts . . 244 



(d) Enzymes ........ 244 



Conclusion 248 



CHAPTER III 



THE EFFECT OF CONDITIONS DURING GERMINATION AND IN 



THE EARLY SEEDLING STAGE UPON SUBSEQUENT GROWTH 



AND FINAL YIELD. 



Introduction. 

 The external conditions operating npon the seed during the critical 

 stages of germination play an important part in determining the vigour 

 of growth and the yield of the resulting plant. A variety of methods 

 have been employed in endeavours to stimulate and accelerate seed- 

 germination, hut in few cases have the effects upon subsequent growth 

 and final yield been studied. The experiments in which this has been 



