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THE RATIO OF CO2–C EMISSION TO GRAIN YIELD IN SUMMER MAIZE CULTIVATED UNDER DIFFERENT SOIL TILLAGE AND STRAW APPLICATION CONDITIONS

Published online by Cambridge University Press:  07 April 2016

HUI FANG HAN
Affiliation:
State Key Laboratory of Crop Biology, Shandong Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an 271018, Shandong, P.R. China
TANG YUAN NING
Affiliation:
State Key Laboratory of Crop Biology, Shandong Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an 271018, Shandong, P.R. China
ZENG JIA LI*
Affiliation:
State Key Laboratory of Crop Biology, Shandong Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an 271018, Shandong, P.R. China
HONG MING CAO
Affiliation:
State Key Laboratory of Crop Biology, Shandong Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an 271018, Shandong, P.R. China
*
Corresponding author. Email: hhf@sdau.edu.cn

Summary

The relationship between climate, crop growth and crop yield is complicated. This study aimed to determine the ratio of CO2–C emission to grain yield, the field treatments were initiated in 2003, but the measurements for this analysis were collected during the summer maize-growing seasons of 2011 and 2012 in the North China Plain. The experiment showed that conventional tillage with straw application significantly increased grain yield and the ratio of CO2–C emission to grain yield of summer maize. The mean soil CO2–C emission rate with no tillage was significantly lower than that when conventional tillage was used; however, straw application significantly increased the soil CO2–C emission rate, irrespective of whether tillage was performed or not. This was mainly because straw application changed the soil total porosity and organic carbon content. In conclusion, the results of this study support the hypothesis that the ratio of CO2–C emission to grain yield in the North China Plain can be increased by straw application, whereas no tillage decreases this ratio.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2016 

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