Abstract
Proso grass was grown in pots in calcareous soils that received different levels of urea applied at seeding under very hot, dry conditions. Urea applications greater than 83 mg N kg/1 in one experiment and 130 mg N kg/1 in another caused severe toxicity to the grass seedlings. The toxicity corresponded to the period of active urea hydrolsis, 3–5 days from germination. At this time detectable NH4 in a low-and a high carbonate soil was equally far below that applied. A level of 40 mg NH4-N per kg soil appeared critical to seedling toxicity.
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Ayed, I., Mashhady, A. The tolerance of a grass forage, grown in pots, to urea applied to calcareous soils under very hot, dry conditions. Fertilizer Research 5, 175–180 (1984). https://doi.org/10.1007/BF01052714
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DOI: https://doi.org/10.1007/BF01052714