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Nitrate and ammonium uptake by nitrogen-deficient perennial ryegrass and Kentucky bluegrass turf



Nitrate and ammonium uptake by nitrogen-deficient perennial ryegrass and Kentucky bluegrass turf



Journal of the American Society for Horticultural Science 114(3): 421-426



Nitrogen uptake by two N-deficient turfgrass species was characterized by measuring N depletion from a complete nutrient solution. The uptake rate of both NO3- and NH4+ was enhanced up to 6-fold in N-deficient perennial ryegrass (Lolium perenne L.) compared to N-sufficient controls, reaching a miximum of about 0.3 and 0.4 g N/m2 per hr for NO3- and NH4+, respectively. Deficiency-enhanced uptake exceeded uptake by controls for about 72 hr following resupply of N. Nitrogen uptake was enhanced to a similar degree by N deprivation in Kentucky bluegrass (Poa pratensis L.) Mowing had no effect on NO3- uptake by N-deficient perennial ryegrass turf, whereas mowing inhihited uptake by N-sufficient turf by approximately 60%. Deficiency-enhanced uptake was found to be the result of an increased capacity for N absorption I(max) rather than an increased affinity for N (Km). I(max) values increased from 0.24 and 0.73 mg N/g dry weight per hr for N-sufficient ryegrass turf for NO3- and NH4+, respectively, to 1.44 and 2.68 mg N/g dry weight per hr for N-deficient turf. Km values increased slightly, from 14 micromole for both N forms for N-sufficient turf to 24 and 39 micromole for NO3- and NH4+, respectively, for N-deficient turf.

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Accession: 001894785

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