Soil factors influencing the distribution of ecotype populations in Echinochloa colonum (L.) Link (Gramineae)
1974
Kapoor, Promila | RAMAKRISHNAN, P.S.
The “short form”, an ecotype of Echinochloa colonum (L.) Link from three distinct soils of varied calcium status, at Malla (calcareous), Shiwalik (moderately calcareous) and Chandigarh (non-calcareous), showed a differential response to a number of nutrients which is related to their natural availability. The decreased growth of the Malla population at high nitrogen and high potassium levels is related to the low availability of these nutrients in calcareous soil. Similarly, the better growth-yield of the Chandigarh population at high levels of these nutrients could similarly be related. The calcareous population from Malla was found to be, in general, more selective with regard to the uptake of various nutrients than the non-calcareous population from Chandigarh. On the basis of the results presented here, three subecotypes have been shown to exist within the ecotype “short form”of E. colonum and this complex pattern of differentiation was shown to be in response to a whole series of selective forces in the environment. The significance of these results is discussed.
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