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| Effects of controlled-release urea on CO2 emission from dry farmland under different mulching patterns |
| Received:March 28, 2019 |
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| KeyWord:plastic film-mulching;corn straw mulching;controlled-release fertilizer;CO2 emissions;dry farmland |
| Author Name | Affiliation | E-mail | | ZHOU Jun-xi | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China
State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A & F University, Yangling 712100, China | | | ZHAI Xiao-fang | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China
State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A & F University, Yangling 712100, China | | | SUN Hao-ran | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China | | | TANG Liang | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China
State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A & F University, Yangling 712100, China | | | SHEN Yu-fang | State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A & F University, Yangling 712100, China | shenyufang@nwafu.edu.cn |
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| Abstract: |
| In order to investigate the effects of controlled-release urea(CRU)on carbon dioxide(CO2)emission from spring maize farmland under different mulching patterns on the Loess Plateau, field experiments were conducted at Changwu Agricultural and Ecological Experimental Station from 2016 to 2018. The experimental treatments included no nitrogen fertilizer application(N0), application of 100% urea at a rate of 225 kg N·hm-(2 N1), and CRU combined with conventional urea application ratio of 1:2 and rate of 225 kg N·hm-2(N2) under plastic film mulching(FM)and straw mulching(SM). The results showed that CO2 emission in dry spring maize farmland increased first and then decreased, ranging from 3.62 to 248.45 mg CO2-C·m-2·h-1. There was a significant and positive correlation between CO2 emission rate and soil temperature for 0~10 cm soil depths under different treatments. Compared with N0, nitrogen fertilizer application significantly increased the CO2 emission rate and cumulative CO2 emission. The cumulative CO2 emission during the growing season of maize and the whole year for the treatment N2 was significantly lower, by 7.3%~10.12%, relative to N1. There was a significant positive correlation between CO2 emission rate and nitrate and ammonium concentrations. Under the same nitrogen application rate, cumulative CO2 emission under straw mulching was higher compared to that under plastic film mulching. These results indicate that CRU and conventional urea application ratio of 1:2 is beneficial for reducing CO2 emission from spring maize fields under different mulching patterns in dry farmland. |
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