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    Application Effect of Fungi Promoting Secondary Fermentation in Composting
    WEI QiHang,FENG Yao,MA QianQian,LI YanLi,LIU YuanWang,LI ZhaoJun,REN YanFang
    Scientia Agricultura Sinica    2021, 54 (24): 5240-5250.   DOI: 10.3864/j.issn.0578-1752.2021.24.007
    Abstract362)   HTML3)    PDF (1980KB)(217)       Save

    【Objective】Secondary fermentation is indispensable to improve the functional value of chicken manure or other breeding wastes. This study applied the screened fungi in the secondary fermentation stage of chicken manure composting to explore the effect of the fungi on promoting the secondary fermentation, and the fungi were identified, so as to provide the theoretical basis and support for the high value and resource utilization of chicken manure. 【Method】The products of chicken manure after primary fermentation were used as raw materials, and two strains of fungi ( FCM1 and FCM3 ) were previously screened in the laboratory and were added before secondary fermentation. Three treatments were set up, including raw materials mixed with 1% (V:W,L·kg-1) sterile liquid medium (CK), raw materials mixed with 1% liquid medium containing FCM1 (F1), and raw materials mixed with 1% liquid medium containing FCM3 (F3), and some indexes were detected, including temperature, pH, electroconductibility (EC), ammonium nitrogen, nitrate nitrogen, GI and humic acid in different secondary fermentation stages. 【Result】Compared with CK, the addition of fungi could promote the temperature rise and humification process during the secondary fermentation stage. Compared with the CK, F3 treatment reached the mesophilic period 8 days earlier, but F1 treatment delayed the second fermentation of chicken manure composting. As for F3 treatment, the thermophilic stage (>50℃) lasted 13 days, GI reached 80% at 25 days earlier than that under CK, and the humification degree was relatively higher (PHA=74.58%, PHA: the ratio of humin and total humus). The correlation analysis showed that GI had significant positive correlation with pH and PHA, and negative correlation with EC. In addition, FCM3 was identified as Alternaria sp. by morphology and ITS rDNA sequencing. 【Conclusion】A strain of fungus FCM3 could promote the secondary fermentation of chicken manure composting, and improve the humification of composting materials, which was of great significance to promote the high value utilization of chicken manure.

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    The Spatial and Temporal Evolution, Regional Correlations and Economic Coordinated Development Effect for Chinese Agricultural Science and Technology Level: Taking Provincial Public Agriculture Research Institutions as an Example
    YUE HuiLi,ZHANG Zhao,ZHANG HuiJie,LIU ShengPing,ZHANG Jie
    Scientia Agricultura Sinica    2021, 54 (24): 5251-5265.   DOI: 10.3864/j.issn.0578-1752.2021.24.008
    Abstract297)   HTML2)    PDF (3947KB)(101)       Save

    【Objective】In the long run, agricultural science & technology and agricultural economics should show a dynamic and mutually beneficial collaborative development trend, which is more conducive to accelerating the development of modern agriculture. To study further the spatial and temporal evolution trends and spatial distribution characteristics of science and technology development of pubic agriculture research institutions, and the coordinated development condition between agricultural science & technology and regional economics, contributes to correctly understand the coordinated development mechanism of agricultural science & technology innovation and regional economy among provinces, and analyze the potential reasons for the poor coordinated development degree of agricultural science & technology and agricultural economy, and explore to find the way to improve the agricultural science & technology innovation level and resolve the problem of “wide gap between agriculture S&T and agriculture economy”. 【Method】Based on numbers of agricultural researchers, the patent grants and numbers of published papers, the GIS technology and ESDA methods are applied for the study of spatial and temporal evolution trends and spatial distribution characteristics of science and technology output by provincial public agriculture research institutions, and coordinated development condition between agricultural science & technology and agricultural economics is revealed. 【Result】 The results show that: During ten years, the science and technology output of provincial public agriculture research institutions are decreasing gradually from the eastern coastal areas to the surroundings; the patent grants are increasing obviously for most provincial agriculture research institutions, while the quantity growth of publication of papers and the agricultural researchers are indistinctive. From the perspective of spatial distribution characteristics, notwithstanding the science and technology output of provincial public agriculture research institutions present the characteristics of local spatial autocorrelation, large-scaled spatial agglomeration effects are not formed. From the perspective of coordinated development condition between agricultural science & technology and agricultural economics, the Eastern cities by Shandong, Jiangsu, Guangdong, Fujian etc. had good performance, the central regions is average and the coordinated development condition between agricultural technology and agricultural economics for the most provinces in Northwest, Southwest and Northeast China are weak. Hereby some policy proposals are put forwarded in aspect of improving the level of science and technology of provincial public agriculture research institutions, and promoting the coordinated development condition between agricultural science & technology and agricultural economics. 【Conclusion】During 2008-2018, the science & technology level of provincial public agriculture research institutions gradually decreased from the eastern coastal areas to the surroundings, showing the features of spatial heterogeneity, and large-scaled spatial agglomeration effects has not been formed. The coordinated development degree between agricultural science & technology level of provincial public agriculture research institutions and provincial agricultural economics is lower, consequently, it is necessary to accelerate the construction of the spatial agglomeration pattern of the coordinated development of agricultural science & technology and agricultural economics, which provides support for solving the problem of “wide gap between agriculture S&T and agriculture economics”.

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