Abstract
The interference between wheat andChenopodium album was studied in pure and mixed stands at two nutrient levels. Wheat responded to density by plasticity whileC. album responded both by mortality and plasticity. In mixtures, crop had an adverse effect on survival and yield of the weed, though to a lesser degree the effect weed on the crop was also noticed. The ecological aspects of the mortal and plastic responses of the competing species are discussed.
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References
Bazzaz F A and Harper J L 1976 Relationship between plant weight and numbers in mixed populations ofSinapia alba (L.) Rabeuh andLepidium sativum L.;J. Appl. Ecol. 13 211–216
Harper J L and Gakoc D 1961 Experimental Studies on the mortality and plasticity of a weed;Weed Rec. 1 91–104
Kapoor P and Ramakrishnan P S 1973 Differential temperature optima for seed germination and seasonal distribution ofChenopdium album L.;Curr. Sci. 42 838–839
Kapoor P and Ramakrishnan P S 1974 Fate of introduced populations ofEchinochloa colona Link. under natural situations;Acta Bot. Indica 2 136–143
Kapoor P and Ramakrishnan P S 1975a Studies on crop—legume behaviour in pure and mixed stands;Agro-Ecosystem 2 61–74
Kapoor P and Ramakrishnan P S 1975b Weed-crop behaviour in pure and mixed stands of maize andEchinochloa colona Link;Proc. Indian Acad. Sci. B82 175–194
Mann H H and Barnes T W 1945 The competition between barley and certain weeds under controlled conditions;Ann. Appl. Biol. 32 15–22
Mann H H and Barnes T W 1950 The competition between barley and certain weeds under controlled conditions. IV. Competition withStellaria media;Ann. Appl. Biol. 37 139–148
Mann H H and Barnes T W 1952 The competition between barley and certain weeds under controlled conditions V. Competition with clover considered as a weed;Ann. Appl, Biol. 39 111–119
Ramakrishnan P S and Kumar S 1971a Mortality, plasticity and productivity of interfering model populations of maize andCynodon dactylon (L.) Pers;J. Indian Bot. Soc. 50 321–331
Ramakrishnan P S and Kumar S 1971b Productivity and plasticity of wheat andCynodon dactylon (L.) Pers. in pure and mixed stands;J. Appl. Ecol. 8 85–98
Ramakrishnan P S and Gupta U 1972 Ecotypic differences inCynodon dactylon (L.) Pers. influencing weed crop interference;J. Appl. Ecol. 9 337–343
Ramakrishnan P S and Kapoor P 1974 Photoperiodic requirements of seasonal populations ofChenopodium album L;J. Ecol. 62 67–73
Sukatschev Y N 1928Plant communities (in Russian) (Moscow)
Vengris J 1955 Chemical composition of weeds and accompanying crop plants;Agron. J. 45 213–218
Welbank P S 1960 Survey of competitive effects of some common weed species; Rep. Rothamst. Exp. Sta. 1959; 84 pp
Yoda K, Kira T, Ogwa H and Hozuni H 1963 Self thinning in over crowded pure stands under cultivated and natural conditions;J. Biol. Osaka City Univ. 14 107–129
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Kapoor, P., Ramakrishnan, P.S. Mortal and plastic responses of pure and mixed populations of wheat andChenopodium album L. at two levels of nutrition. Proc. Indian Acad. Sci. 87, 243–253 (1978). https://doi.org/10.1007/BF03048920
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DOI: https://doi.org/10.1007/BF03048920