Initial growth of plants of physic nut under shading in the Gurupi county, Tocantins State, Brazil
DOI:
https://doi.org/10.20873/jbb.uft.cemaf.v2n4.costaKeywords:
Jatropha curcas, análise de crescimento, luminosidade, EuphorbiaceaeAbstract
The growth analysis has been used by researchers to explain differences in the growth, which can be caused for genetic factors or by environmental modifications and constitutes efficient tool for the identification of favorable environments, besides identifying characteristics in the initial growth, to indicate possibility in the increase of growth of the adult plant, favoring the genetic breeding for material more productive. The aim of this research was to study the initial growth of the physic nut (Jatropha curcas L.) in three shading levels (0%, 50% and 90%). The evaluated variables were height of plants, stem base diameter, leaf area, dry mass of the leaves, total dry mass and number of leaves at the 7, 14, 21, 28, 35 and 42 days after the emergency of the plants. The largest height of the plants was observed in 50% of shading and the smallest in 0% of shading. The largest stem base diameter was obtained in plants with 0% of shading and the smallest in 90%. Plants cultivated on 50% of shading presented larger number of leaves, leaf area, dry mass of the leaves and total dry mass. The best development of seedlings of physic nut occurs under 50% of shading in the Gurupi, TO.
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