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Fixation and transfer of nitrogen in a white clover‐grass sward under hill conditions
Author(s) -
HAYSTEAD A.,
MARRIOTT CAROL
Publication year - 1978
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1978.tb00740.x
Subject(s) - trifolium repens , biology , agronomy , pasture , nitrogen , nitrogen fixation , growing season , nitrogen cycle , context (archaeology) , grazing , ecotype , botany , paleontology , physics , genetics , quantum mechanics , bacteria
SUMMARY Experiments are described to illustrate the different effect of defoliation and diurnal changes in light intensity and temperature on grazed white clover (Trifolium repens) ecotypes and pot grown clover. Removing all the fully expanded leaves from grazed clover has no effect on nodule numbers or on nitrogen fixing activity during the phase of early season rapid growth. No diurnal rhythm in nitrogen fixing activity is apparent in grazed clover swards. Isotope dilution experiments demonstrate that in the first half of the growing season underground transfer of nitrogen is low in cut plots in a previously grazed hill situation. The results are briefly described in the context of improved hill pasture utilisation.