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Effects of fertilizer treatments on seedling growth and cold resistance of triploid Populus tomentosa.

Liu Yong;Chen Yan;Zhang Zhiyi;Li Xingguo. Journal of Beijing Forest University (2000) 22(1)38~44 [Ch, 8 ref.] College of Resources and Environment, Beijing For. Univ., 100083, P. R. China.  
In order to study the effects of fertilizer treatments on seedling growth and cold resistance of triploid Populus tomentosa , seedlings were treated with different fertilizing time and regime. The results show that fertilizing in autumn after height growth stop can help seedlings absorb N and P and increase cold resistance. Fertilizing in both early fast growing period and autumn can not only enhance seedling growth but also increase cold resistance. After evaluating by an integrated indicator, combined from relative electric conductivity, rate of water loss, water saturation deficit, and growth recover test, the sequence of effects of fertilizing treatments on seedling cold resistance is as follows: applying total fertilizer in autumn applying 1/2 fertilizer in early fast growing period and 1/2 in autumn applying total fertilizer in early fast growing period applying 1/3 in early fast growing period , 1/3 in later fast growing period, 1/3 in autumncontrol (no fertilizer)applying 1/3 in early fast growing period, 1/3 in middle fast growing period, 1/3 in later fast growing period applying 1/2 in early fast growing period , 1/2 in later fast growing period.
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