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Injury Symptom of Egg Plant Grown in a High pH Rockwool Amended with Ammonium Phosphate  

Kim, Yoo-Hak (National Academy of Agricultural Science)
Lee, Hyeong-Yong (Agricultural Technology Center of Pyoengteak)
Kim, Myung-Sook (National Academy of Agricultural Science)
Kang, Seong-Soo (National Academy of Agricultural Science)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.43, no.6, 2010 , pp. 975-977 More about this Journal
Abstract
Ammonium nitrogen is volatilized as ammonia at high pH soil. This study was conducted to observe an injury cause of egg plant grown in a high pH rockwool amended with ammonium phosphate. The etiolation symptom (yellowing) was appeared on veins of a leaf but not in healthy root when nutrient solution containing ammonium phosphate in addition to essential elements was applied in a top soil of which pH was 7.8. However, the same symptom did not appeared in the egg plant from the top soil in which the nutrition solution containing potassium phosphate instead of ammonium phosphate was applied. pHs were similar between these two different solutions. This revealed that the injury was caused by ammonia gas.
Keywords
Egg plant; Ammonia gas toxicity; pH;
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