Nitrogen metabolism of stargrass as affected by nitrogen and soil salinity

Langdale, G.W.; Thomas, J.R.; Littleton, T.G.

Agronomy Journal 65(3): 468-470


ISSN/ISBN: 0002-1962
DOI: 10.2134/agronj1973.00021962006500030034x
Accession: 000146180

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In pot trials, stargrass (Cynodon plectostachyus) was grown in Brennan fine sandy loam and mixed solutions of chloride and sulphate with the same ionic ratios and electrical conductivities (EC) of 4.8, 9.6 and 14.4 mmho/cm were equilibrated with the soil. N was applied at 0, 67, 133, or 200 mg/kg of soil after transplanting and after the 1st 2 cuts. N fertilizer interacted significantly with soil salinity to stimulate DM and protein-N yields at EC 4.8 mmho/cm. There was no evidence of accumulation of toxic non-protein-N in plants with high N fertilization at this salinity level. EC 9.6 mmho/cm was considerably more deleterious to DM production than to protein-N production. DM production and protein-N synthesis were severely inhibited at EC 14.4 mmho/cm, although nitrate-N appeared to be adequately absorbed and reduced.