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DIFFERENTIAL SURVIVAL OF PLANT TYPES IN SWARDS
Author(s) -
Charles Allen H.
Publication year - 1964
Publication title -
grass and forage science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.716
H-Index - 56
eISSN - 1365-2494
pISSN - 0142-5242
DOI - 10.1111/j.1365-2494.1964.tb01162.x
Subject(s) - edaphic , cultivar , biology , agronomy , population , lolium perenne , selection (genetic algorithm) , perennial plant , ecology , soil water , demography , artificial intelligence , sociology , computer science
Populations of Lolium spp., Dacrylis spp., and Phleum , each based on two or more cultivars, were subjected to three managements and iwo nitrogen levels. Rapid changes i n population structure occurred in response lo agronomic selection pressures and some cultivars were eliminated from the swards in less than four years, even though they were able to persist for longer periods when sown separately. The frequency and method of defoliation, time of nitrogen application, and edaphic factors produced changes i n the proportion of the cultivar subgroups in the populations, and there were indications of differential survival within cultivars. The results are discussed in relation to the utilization of cultivars in mixtures and the selective action of biotic and edaphic factors.