对3个品种(GT1、RRIM600、PR107)的橡胶实生苗进行N、P、K营养调控(N、P、K养分胁迫→恢复正常施肥→再胁迫)处理,并分析橡胶实生苗的主要生物学性状指标.结果表明:(1)橡胶实生苗在N、P、K养分调控下出现的缺素症状与橡胶成龄树相似；(2)橡胶实生苗的株高、茎粗,叶蓬距、叶面积等随着N、P、K营养调控而出现生长受阻→恢复生长→再次受阻等规律性变化；(3)橡胶实生苗的叶蓬距、叶面积对N、P、K营养调控的响应较为敏感,可作为主要观测指标；(4)开展橡胶树实生苗N、P、K营养调控研究,应在胁迫处理后新生第3蓬叶时,观测其生物学性状较为适宜.%Rubber seedlings of three clones ( GT1, RRIM600, PR107) were treated with N, P, K nutrient regulation, namely low N, P, K stress was conducted on the rubber seedling until it appeared obvious hunger signs, then refertilized the plant till restored and followed by low N, P, K stress again. And the main biological traits performance of the rubber seedlings treated was compared and analyzed. The results showed as follows. (1) The deficiency symptom of rubber seedlings under N, P, K nutrients regulation treatment was similar to that of rubber trees. (2) Growth of the height, stem diameter, leaf-umbrella distance, leaf area of rubber seedling were stunted→restored→blocked again that changed with N, P, K nutrient regulation treatment. ( 3 ) Leaf-umbrella distance and leaf area of rubber seedling were more sensitive in response to N, P, K nutrients regulation treatment, they would be used as a main observation index of biological traits. (4) In the research of N, P, K nutrients regulation of rubber seedlings, it was recommended that the biological traits were suitably observed after the neonatal third leaf-umbrella.
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