Adderson, Jock R; Hazel, Peter B.R. <br/><br/>
Variability of cereal yields sources of changed and implications for agricultural research and policy. 

 - Washinton :  IFPRI,  1987. 
<br/><br/> The article reviews available evidence on patterns of viability in world cereal production and how patterns have changed in recent years. The biological climatic and economic factors underlying yield viability are discussed. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cereals.<br/>Climate -- Agricultural research.--Climate -- Agricultural research.