Abstract:

To provide references for reasonable use of organic fertilizer, the organic nutrients’ change during fermentation in flue-cured tobacco production in Guangdong was studied. Indoor cultivation method was used under constant temperature and humidity, the kinds, content and change rules of organic substances were analyzed during fermentation. The results showed that 7 organic acids, 18 amino acids, higher fatty acid C12-C20 and ferulic acid were produced during the fermentation of peanut fertilizer. The major organic acids produced during fermentation were lactic acid (80.0 g/kg after 50 days) and malic acid (40.0 g/kg after 50 days), and then was acetic acid (31.84 g/kg after 50 days), the citric acid, succinic acid and tartaric acid had no obvious difference in the fermentation, oxalic acid had lower content of 0.32-1.83 g/kg. The amino acid content increased with the fermentation time of peanut and pig manure fertilizer, and glutamic acid had the highest content, then were asparaginc acid and aminocaproic acid; amino acid content of peanut fertilizer was twice that of pig manure fertilizer. Higher fatty acid oleic acid (38.78%-44.46%) and linoleic acid (37.0%-38.0%) were higher in peanut fermentation, then were palmitic acid (9.16%-13.22%), stearic acid (2.31%-3.08%) and linolenic acid (1.08%-1.58%). The C18 and C16 acids were the dominant components, and the content of saturated acids was lower than that of the unsaturated acids obviously. The content of ferulic acids increased with fermentation time, reaching 15.23 μg/kg after 50 days.

Key words: peanut fertilizer, pig manure, fermentation, organic nutrients