400 



Journal of Agricultural Research 



Vol. IV. No. s 



Table IV. — Water requirement of parent and hybrid strains of wheat in 1914 — Contd. 



EFFECT OF SELF- AND CROSS-POLLINATION 



In addition to the maize hybrids Mr. Collins also supplied self -pollinated 

 seed of two individuals, together with cross-pollinated seed from the same 

 individuals. The cross-pollinated plants in this case represent pure seed 

 of the selected strain. Reference to Table V will show that in one 

 instance self-pollination produced no measurable change in the water 

 requirement, while in the other instance an increase in water requirement 

 of 4±i per cent was observed. The plants from the cross-pollinated 

 seed also gave a higher yield of dry matter. The effect of cross-pollina- 

 tion between indi\aduals is, in this instance at least, quite similar to 

 results produced by the cross-pollination of different strains, so far as 

 water requirement and yield are concerned. 



Table V. — Ejffect of self- and cross-pollination on the water requirement of corn in IQI4 



