Search

Copyright of Computer Engineering & Science / Jisuanji Gongcheng yu Kexue is the property of Computer Engineering & Science 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 Forest Research is the property of Forest Research Editorial Office 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 Forest Research is the property of Forest Research Editorial Office 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 Forest Research is the property of Forest Research Editorial Office 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 Arid Zone Research / Ganhanqu Yanjiu is the property of Arid Zone Research Editorial Office 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.)

In order to clarify the response of millet in summer sowing area of millet in Henan province to planting density and nitrogen application rate, in this study, taking Zhenggu 3 as the experimental material, a split plot experimental design was adopted, with planting density as the main area and nitrogen application rate as the sub-area. The effects of different planting density(400 000, 600 000, 800 000 plants/ha) and nitrogen application(pure N) level(0, 60, 120, 180 kg/ha) on millet yield and related agronomic traits were analyzed. The results showed that with the increase of planting density and nitrogen application level, the millet yield increased first and then decreased. The yield of 600 000 plants/ha was the highest, reaching 5 441.1 kg/ha. Regression analysis was carried out on the change of yield with planting density, and 580 000-730 000 plants/ha was determined as the best density. Among different nitrogen application levels, the yield of 120 kg/ha was the highest, which was 5 501.39 kg/ha. Regression analysis of yield change with nitrogen application level found that it was determined that 100-125 kg/ha was the best nitrogen application rate in the study region. There was a significant interaction effect between planting density and nitrogen application level on millet yield. The treatment with planting density level of 600 000 plants/ha and nitrogen application level of 120 kg/ha had the highest yield, which was 6 479.2 kg/ha. With the increase of planting density, spike length, stem diameter, spike diameter, single spike weight, grain weight per spike of millet, and 1000-grain weight under different treatments showed a downward trend. With the increase of nitrogen application level, spike length, stem diameter, spike diameter, single spike weight and grain weight per spike increased first and then decreased, which was the best in the treatment of 120 kg/ha. Based on the results above, the suitable cultivation method conducive to giving full play to the yield potential of Zhenggu 3 in the summer sowing area of millet in Henan province was seedling density of 600 000 plants/ha and nitrogen application of 120 kg/ha. [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao is the property of Chinese Journal of Applied Ecology 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 Forest Research is the property of Forest Research Editorial Office 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.)

The lightning electric field signal recorded by ground-based lightning detection stations generally has a polarity reversal phenomenon, and the polarity reversal time of different stations is different. At present, this phenomenon is not clearly understood. The measurement principle of electric field change signal caused by lightning discharge is described in detail. Based on this, using broadband electric field and VHF radiation data, combined with the location results of lightning VHF radiation source, the characteristics and causes of polarity reversal of lightning electric field pulse is analyzed. Comparing multi-station data with an interval of 5 km, it is found that the electric field polarity reversal at different stations does not occur at the same time. And the polarity reversal is often accompanied by a decrease in pulse amplitude, which often results in pulse missing or time error increasing of arriving pulses during positioning. Using broadband electric field positioning and VHF radiation source positioning to complement each other, on the basis of obtaining refined three-dimensional positioning of lightning, it is found that the development direction change of the lightning channel head caused the polarity reversal phenomenon of the vertical electric field. The proximity or distance of the large amount of electric charges carried by the head of the main channel is the main reason for the pulse fluctuation of the ground vertical electric field change measurement device. For lightning detection stations with different orientations, the relative movement of the head of the main lightning channel is the main reason for the different timing of pulse polarity reversal at different detection stations. Aiming at the problem of decreased positioning efficiency caused by the polarity reversal phenomenon, this paper proposes a solution for Hilbert energy spectrum, which increases the number of lightning radiation sources located by about 9%. [ABSTRACT FROM AUTHOR]

Copyright of Forest Research is the property of Forest Research Editorial Office 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 Forest & Environment is the property of Journal of Forest & Environment Editorial 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 Computer Engineering & Science / Jisuanji Gongcheng yu Kexue is the property of Computer Engineering & Science 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 Forest Research is the property of Forest Research Editorial Office 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 Henan Agricultural Sciences is the property of Editorial Board of Journal of Henan 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 Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao is the property of Chinese Journal of Applied Ecology 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 Food Safety & Quality is the property of Journal of Food Safety & Quality Editorial Department 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 Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department 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 Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao is the property of Chinese Journal of Applied Ecology 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 Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao is the property of Chinese Journal of Applied Ecology 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 Forest Research is the property of Forest Research Editorial Office 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] The resistance and resistance mechanism of weed crabgrass Digitaria sanguinalis to atrazine in Guangxi sugarcane field were studied to provide references for scientific control and resistance management. [Method]The resistance level of 25 Digitaria sanguinalis population collected in Guangxi sugarcane area was determined by pot experiment and the whole plant method. The resistance mechanisms were studied by using physiological biochemical and molecular biology methods. [Result] As to the resistance of 76 % to atrazine in the population, Guigang-1 was the highest, which resistance index( RI) was 37. 2. Chongzuo-4 was a sensitive strain, the relative vigor of the GSTs of Baise-1 and Liuzhou 2 population were significantly higher than that of the sensitive population after 3 days, and the psbA gene of D-1 protein on chlorophyll was sequenced, and the psbA gene of the resistant population were found to have no mutation, and the activity of GSTs was increased with the resistance of Digitaria sanguinalis to Atrazine. [Conclusion] The resistance of Digitaria sanguinalis to atrazine in Guangxi sugarcane field is low to medium level. The resistance of the resistant population to atrazine may be related to the enhancement of GSTs activity. [ABSTRACT FROM AUTHOR]