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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.
JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.
Grass seedling establishment has been a perennial problem on arid and semi-arid lands. Certain combinations of some of the factors that affect it result in success one year and failure the next. Temperature, which appears to be one of the primary factors influencing seedling establishment, was selected for this study. Environmental factors such as temperature, in their extremes, restrict or kill living organisms. Within the limits of biological activity, however, the effects of gradations in temperature on the different plant processes are not well known. As with most plantregulating factors, temperature effects are modified by and sometimes masked by other factors of the environment. The effects of specific factors vary with different species and even considerably within s p e c i e s (Haskell and Singleton, 1949). Ludwig and Harper (1958)) studying maize, concluded that soil temperature at planting time was an important factor in the time lapse from planting to emergence and the percentage of grains which became established as seedling. Working with fescue seed, Kern and Toole (1939)) found a general decline in maximum germination with an increase in temperature from 10" to 30°C. Germination tests of I Cooperative investigations of the
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