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Copyright of Journal of Agricultural Science & Technology (1008-0864) is the property of Journal of Agricultural Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Agricultural Science & Technology (1008-0864) is the property of Journal of Agricultural Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

【Objective】In order to provide the scientific basis for obstacles research and development, nutrient management and high-quality flue-cured tobacco production in regional tobacco planting soil, the characteristics of main obstacles to tobacco planting soil in 5 counties（cities, districts）of Baoshan city were analyzed.【Method】The samples of tobacco planting soil were collected from 72 villages in 24 towns in 5 counties of Baoshan city.Total of 12 indexes, including pH, organic matter（OM）, total N（TN）, total P（TP）, total K（TK）, alkaline N（AN）, available P（AP）, available K（AK）, soil bulk density（BD）, field water holding capacity（FC）, sucrase invertase（INV）and urease（URE）, were selected as the total data set（TDS）to construct the minimum data set（MDS）, and the soil quality index was calculated, and the main obstacle factors were analyzed by using the diagnosis model of obstacle factors.【Result】By K-S test, the 12 indexes complied with the normal distribution and were included in TDS. Six indexes including OM, TP, AN, AP, BD and INV were included in the MDS by principal component analysis.The MDS-SQI of soil quality index was positively correlated with TDS-SQI, and the MDS could represent the TDS to evaluate the soil quality in Baoshan tobacco planting area.The MDS-SQI soil quality indexes in Shidian county, Changning county, Longyang district, Longling county and Tengchong city were 0.681, 0.668, 0.665, 0.626 and 0.579, respectively.The obstacle degree analysis showed that the main obstacle factors were FC（average obstacle 0.251）, AN（average obstacle 0.196）, pH（average obstacle 0.142）and OM（average obstacle 0.110）.【Conclusion】The established MDS of soil quality assessment has certain representativeness and accuracy, which can be used to evaluate and diagnose soil quality and obstacles. [ABSTRACT FROM AUTHOR]

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Environmental Science & Technology (10036504) is the property of Editorial Board of Environmental Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

It has great significance for screening pepper germplasm or breeding new cultivars to identify accurately the resistance levels of peppers. In this paper, the resistance levels of pepper seedlings to Phytophthora root rot at different growth stages were investigated by irrigating inoculation with zoospore suspension of Phytophthora capsici isolates that belonged to prevalent race 3 from Yunnan. The results showed that resistance, moderate resistance and susceptible pepper seedlings against Phytophthora capsici had significant differentiation under 20 - 25 °C when inoculated at 20 d ( cotyledon stage ), 40 d ( 3 - 4 leaf stage ), 60 d ( 5 - 6 leaf stage ) and 90 d ( early squaring ). That is, resistance levels from strong to weak at different growth stages of pepper seedlings were 90 d > 60 d > 40 d > 20 d, which suggested that resistance levels of peppers were positively correlated with seedling ages. The pepper seedlings inoculated by irrigation at 60 d ( 5 - 6 leaf stage ) could reflect the true resistance of different pepper cultivars. This study defined the suitable growth stage for resistance evaluation of Phytophthora root rot disease on pepper and also provided a scientific basis for screening and identification of the pepper germplasms or resistance cultivars. [ABSTRACT FROM AUTHOR]