This paper deals with the mechanism of inftibition of NHe from urea hydrolysis in silt loam soil with low K content and the prevention of this toxicity by the application of farm manure and K on barley (Hordeum vulgare Jess). The results obtained are summarzed as follows: The pH of soil relating to the concentration of free NH3 raised about 1.3 units 10 days ofter applying 122kg/ha urea in the soil, and a significant inhibition of NH3 on barley growth was observed while the concentration of free NH3 in soil solution was about 4 ppm. The membrave structure of both root and leaf tissue was severely injured by NH3. The injured barley was low in respiratory rate and activities of photophosphorylation, nitrate reductase and Qlutamine synthetase, but high in the rate of photosynthetic electron transport and the contents of free amino acids.
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章永松,孙羲,应启肇.有机肥和钾对防治大麦氨害的作用[J].土壤学报,1990,27(1):80-86. Zhang Yongsong, Sun Xi, Ying Qizhao. EFFECT OF ORGANIC MANURE AND POTASSIUM ON PREVENTING BARLEY FROM NH3 TOXICITY[J]. Acta Pedologica Sinica,1990,27(1):80-86.