N、P、K营养调控下橡胶实生苗的主要生物学性状表现

Main biological traits performance of rubber seedlings under N,P,K nutrient regulation treatment

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 H, 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 d/stance, leaf area of rubber seedling were stunted---~restored --＋blocked again that changed with N, P, K nutrient regulation treatment. （3） Leaf-umbrella dis- tance 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 rec- ommended that the biological traits were suitably observed after the neonatal third leaf-umbrella.