TY  - JA
AU  - Plucknett,D.L.
AU  - Smith,N.J.H.
TI  - Sustaining agricultural yields
PY  - 1986///
KW  - Crop yield
KW  - AGROVOC
KW  - Genetic stability
KW  - Germplasm conservation
KW  - Research
KW  - Research policies
KW  - Varieties
KW  - Yield components
KW  - Yield factors
KW  - Plant breeding
N1  - Graphs, references p. 44-45
N2  - The principles and scope of maintenance research are examined and the role of plant breeding in this research is considered. Maintenance research is seen as particularly important in maintaining the yield gains obtained from improved varieties, in combating evolutionary changes in crop pests, particularly in the tropics where reproduction occurs throughout the year, and in incorporating a range of resistance genes (rather than a single gene) into crops to produce a more durable resistence. Examples of breeding to maintain yields, for example through improved pest resistance, are taken from a range of crop breeding programs in a
T2  - Bioscience
ER  -