Alterações fisiológicas em mudas de Eucalyptus grandis (Hill) ex Maiden submetidas à fertilização nitrogenada e ação do etileno

Ciencia Florestal

article

Deisinara Giane Schulz¹  Michelle Cristina Ajala²  Marlene de Matos Malavasi²  Ubirajara Contro Malavasi² 

[1] Instituto Federal do Paraná;Universidade Estadual do Oeste do Paraná

关键词: Hardening;    Seedling production;    Exponential fertilization;    Eucalyptus;   

DOI  :  10.5902/1980509822318

学科分类：农业科学（综合）

来源: Universidade Federal de Santa Maria * Centro de Pesquisas Florestais

【 摘 要 】

Fertilization and hardening during seedling production are extremely important to promote morpho-physiological changes that enhance growth and minimize the stress damage after field planting. This experiment aimed to evaluate nitrogen fertilization during production of Eucalyptus grandis (Hill) ex Maiden seedlings and to quantify morphometric changes. The experiment was conducted in a greenhouse located at 24°33 ‘S and 54°04’ W in a randomized complete block design in a factorial scheme with an additional control (3 x 4+1) composed by three regimes of fertilization (100 mg L-1 conventional N, 100 mg L-1 exponential N and zero N) applied for three months (nine applications) and four ethylene applications of 1000 mg L-1 more one control without application of plant regulator with six replicates of five plants per plot. Fertilization, both exponential or conventional, as well as the weekly application of ethylene, induced physiological changes of Eucalyptus grandis seedlings during hardening. Fertilization regimes presented similar effects with two ethylene applications, reducing phosphorus and potassium levels and stimulating the accumulation of lignin in the cell wall of roots. There was no effect of the fertilization regimes and the ethylene application on the survival of Eucalyptus grandis seedlings.

【 授权许可】

CC BY-NC