| The pyrolysis of plant biomass(Mainly composed of cellulose,hemicellulose,and lignin)produces a large amount of volatile gas,and the liquid mixture formed by condensing it is called Wood vinegar or Pyroligneous acid.As a by-product of natural agricultural and forestry products,wood vinegar has many functions such as promoting plant growth,soil disinfection,antibacterial,insecticidal,antiseptic and soil environment improvement.Therefore,it is of great economic and social significance to clarify the organic components of wood vinegar and its potential effects on plant growth and development.In this study,the typical bulk crop rice was used as the target.The pyrolysis-gas chromatography and mass spectrometry(PY-GC/MS)was used to detect the cracking of gaseous products in rice straw and rice husk at 300 °C,500 °C and 700 °C.The type and relative content,under the guidance of the theory of "stalk carbonization and returning to the field".In order to analyze the organic components of rice husk vinegar,we derivatized and diluted the two treatment methods,and then detected by gas chromatography and mass spectrometry(GC/MS).The rice husk vinegar is divided into four distillation sections of100°C-105°C,105°C-110°C,110°C-130°C and 130°C-160°C by atmospheric distillation.The organic component of the distillate compares the differences in the composition of different rice husk vinegar distillates.According to the plant metabolism database(www.plantcyc.org),the potential effects of wood vinegar on plant growth were studied,and the effects of rice husk vinegar and its distillate on rice morphological indexes were preliminarily observed by soilless culture.The main findings of this study are as follows:1.A variety of organic compounds exist in the pyrolysis volatiles of rice straw and rice husk,and are classified into lipids,ethers,aminos,alkanes,alkenes,alcohols,carboxylic acids,carbonyls according to functional groups.Classes,furans and phenols.The amount of compound species in the pyrolysis volatiles increases as the pyrolysis temperature increases.At 300 °C,500 °C,and 700 °C,76,199,and 206 compounds were produced in rice straw,and 85,138,and 252 compounds were produced in rice husk.At the same pyrolysistemperature,the types and components of pyrolysis volatile compounds of rice straw and rice husk were different.The main cracking products of rice straw were alcoholic hydroxyl compounds,and the main cracking products of rice husk were carbonyl compounds.2.The rice husk vinegar was treated by derivatization method,and it was found that the detected organic components were more than the direct injection method.The results of combining the two methods showed that there were 87 organic compounds in rice husk vinegar,among which 10 compounds could promote plant growth.3.The large molecular weight compound in the rice husk vinegar distillate is less than the rice vinegar stock solution,and the biological active ingredient species are also reduced,after the atmospheric distillation treatment.There is a small difference in the composition of the rice husk vinegar distillate between the four fractions,and the content varies greatly.4.The rice husk vinegar diluted 1000 times effectively promotes rice seedling growth,inhibiting growth at other dilution factors.Diluting 300-1000 times of rice vinegar distillate collected at 100 °C-105 °C and 105 °C-110 °C promotes the growth of rice seedlings,at110 °C-130 °C Diluted 500 times and 700 times of the rice vinegar distillate collected to promote the growth of rice seedlings,and the rice husk vinegar distillate collected at 130 °C-160 ° C was diluted 700 times and 1000 times to rice seedlings.Period growth promotes.Other treatments inhibited the growth of rice seedlings. |
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