Jatropha seed cake effects the growth of Jatropha curcas
Date Issued
2015
Date
2015
Author(s)
Chou, Ting-Yu
Abstract
Jatropha curcas is widely distributed in tropical and subtropical regions with the high adaptability in soil and environment. The seeds with high oil content could be converted into the biodiesel as an alternative fuel. It can grow in barren soil and not compete with food crops. With high biomass production, it is suitable for phytoremediation as a carbon sink. The biodiesel produced less environmental pollution. The waste products of seeds after oil extraction as manures can also achieve zero waste agriculture purposes. After the seeds were crushed, waste productions were produced, like seed cake, hull and the annual pruning of the stems, are the main materials of compost. Measure its maturity after indoor and outdoor fermentation. Jatropha seedlings were applied different levels of seed cake compost and chemical fertilizer to perform a comparison test. Investigate Jatropha curcas growth parameters and photosynthesis rate to assess the effectiveness of seed cake compost, and test whether the compost has allelopathic potential. The results showed that the chemical fertilizer applied high nitrogen level didn’t significantly increase photosynthesis as lower stomatal conductance though it has the high chlorophyll index. Moreover, Jatropha curcas seed cake compost must apply to high nitrogen levels to raise photosynthesis Pn (Net CO2 assimilation rate) 、Ci (Intercellular CO2 concentration) 、gs (Stomatal conductance) . It indicates that Jatropha curcas seed cake compost provides nutrients for seedling growth, however still need more long-term decompose. In compost treatment, the chlorophyll fluorescence non-photochemical quenching increases to induce light protection help relieve environmental stress. According to bioassay results, the indoor fermentation compared to outdoor fermentation treatment, significantly inhibited the root and hypocotyl growth. Similar results were obtained with the total phenolic content. Inference that more complete fermentation maturity which reduces the allelopathic potential, will not impact on fertility of cultivated crops.
Subjects
bioassay
non-photochemical quenching
allelopathic potential
compost
Jatropha curcas seed cake.
Type
thesis
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