Phosphorus（P） is hard to dissolve and be absorbed for plants.To improve the P efficiency and find the best P applying method, Larix olgensis sowed seedlings (1-0) were used to study the growth effect and Puptaking by seedlings affected by P amounts and fertigation ratios.The experiment conducted the splitspot design,with P amounts as main treatment and fertigation ratios as side treatment. The results showed that P concentration, P content,phosphorus using efficency was affected by phosphorus amounts significantly. The P concentration arrived the highest lever under the phosphorus amount 326 kg／hm2,but the phosphorus use efficency increased as the phosphorus deceased,and arrived the highest lever (43 ％)under the phosphorus amount 163 kg／hm2. At the same phosphorus amounts,fertigation ratios also had remarkable effect on P concentration, P content and phosphorus using efficency. Maximum of these indicators exhibited under 333 ％ fertigation ratio, for example the total P content and phosphorus use efficiency were 0079 g and 43 ％ respectively. The results showed that the best fertigation ratio was 333%. So a combination of two thirds of the phosphorus as basal fertilizer when transplanted, and one third as topdressing in August is the best phosphorus applying method for L. olgensis sowed seedlings.
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