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- W2002190889 abstract "G. W. BOURDOT* SUMMARY The growth of a 1-yr-old lucerne (Medicago sativa) stand subjected to nitrogen stress was analysed using a simple model that related growth to intercepted photosynthetically active radiation (PAR). Nitrogen stress was systematically induced by establishing a range of populations of Sitona discoideus (Coleoptera: Curculionidae) larvae in the stand. The direct influence of their feeding on the plants' nitrogen-fixing root rhizobial nodules was confirmed by the strong linear relationship found between larval density and herbage nitrogen concentration (N%). The negative effect of nitrogen stress on herbage production was found to become abruptly apparent at an N% level of 4–7%. Eighty-seven percent of the loss in dry matter production in the nitrogen-stressed plants was associated with a decline in the ability of the canopy to use PAR, rather than a reduction in the amount of PAR intercepted. From the results obtained it was concluded that the damage effects of S. discoideus larvae were less drought-related than initially thought. It is speculated that the abrupt onset of damage occurred when the re-establishing rhizobial root nodule population demanded more nitrogen than it fixed." @default.
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- W2002190889 date "1988-08-01" @default.
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- W2002190889 title "The response of field-grown lucerne to a manipulated range of insect-induced nitrogen stresses" @default.
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- W2002190889 doi "https://doi.org/10.1111/j.1744-7348.1988.tb03295.x" @default.
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