Quantitative Relationship Between Nitrous Oxide Emissions and Nitrogen Application Rate for a Typical Intensive Vegetable Cropping System in Southeastern China

2016 ◽  
Vol 44 (12) ◽  
pp. 1725-1732 ◽  
Author(s):  
Man Zhang ◽  
Zhao Zhi Chen ◽  
Qiao Ling Li ◽  
Chang Hua Fan ◽  
Zheng Qin Xiong
Keyword(s):  
Nitrous Oxide ◽  
Cropping System ◽  
Quantitative Relationship ◽  
Application Rate ◽  
Nitrous Oxide Emissions ◽  
Nitrogen Application ◽  
Southeastern China ◽  
Nitrogen Application Rate

Nitrogen application rate, timing and history effects on nitrous oxide emissions from corn (Zea maysL.)

2014 ◽  
Vol 94 (4) ◽  
pp. 563-573 ◽  
Author(s):  
Amal K. Roy ◽  
Claudia Wagner-Riddle ◽  
Bill Deen ◽  
John Lauzon ◽  
Tom Bruulsema
Keyword(s):  
Nitrous Oxide ◽  
Grain Yield ◽  
Application Rate ◽  
Nitrous Oxide Emissions ◽  
Nitrogen Application ◽  
N Application ◽  
History Effects ◽  
History Of ◽  
Nitrogen Application Rate ◽  
Corn Grain

Roy, A. K., Wagner-Riddle, C., Deen, B., Lauzon, J. and Bruulsema, T. 2014. Nitrogen application rate, timing and history effects on nitrous oxide emissions from corn (Zea mays L.). Can. J. Soil Sci. 94: 563–573. Nitrous oxide (N2O) emissions resulting from application of nitrogen (N) fertilizer contribute to the greenhouse gas footprint of corn production. In eastern Canada, corn is a major crop with most N fertilizer applied pre- or at planting. This timing of application results in a lack of synchrony of soil N supply and crop N demand. Matching the amount and timing of application to crop uptake has been suggested as a mitigation measure to reduce N losses, and is an integral part of the 4R Nutrient Stewardship program. This study examined the effect of timing, rate and history of urea-ammonium nitrate application on N2O emissions in corn in 2011 and 2012 at Elora, ON, Canada. Treatments were three N rates (30, 145 and 218 kg N ha−1); two timings (N injected in mid-row at planting and at the 8th leaf stage, V8); two histories (short-term: applying N rate treatments on plots that had received 145 kg N ha−1in the previous year, and long-term: applying the same N rate to a given plot over the duration of the trial). N2O emissions were measured using static chambers. History of N application did not have an effect on N2O emissions or grain yield. In both years, cumulative N2O emissions during the growing season and corn yields increased significantly with increasing N application rates. In 2011, cumulative N2O emissions were significantly lower when N was applied as side-dress at V8 (0.88 kg N ha−1) compared with planting (2.12 kg N ha−1), with no significant impact on corn grain yield (average 9.1 Mg ha−1). In contrast, in 2012, limited rainfall reduced both N2O emissions and corn grain yield, and neither N2O emission (average 0.17 kg N ha−1) nor grain yield (average 6.7 Mg ha−1) was affected by timing of N application. Applying N as side-dress at V8 instead of at planting and using the recommended N rate were shown to be effective N2O emission mitigation practices without affecting corn yield during a typical wet spring in Ontario.

Cotton physiological and agronomic response to nitrogen application rate

2021 ◽  
Vol 270 ◽  
pp. 108194
Author(s):  
John Snider ◽  
Glendon Harris ◽  
Phillip Roberts ◽  
Calvin Meeks ◽  
Daryl Chastain ◽  
...  
Keyword(s):  
Application Rate ◽  
Nitrogen Application ◽  
Nitrogen Application Rate

scholarly journals Effects of nitrogen application rate on the photosynthetic pigment, leaf fluorescence characteristics, and yield of indica hybrid rice and their interrelations

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jinfeng Peng ◽  
Yuehua Feng ◽  
Xiaoke Wang ◽  
Jie Li ◽  
Guiling Xu ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Hybrid Rice ◽  
Photosynthetic Pigment ◽  
Application Rate ◽  
Maturity Stage ◽  
Nitrogen Application ◽  
Fluorescence Characteristics ◽  
Heading Stage ◽  
Indica Hybrid Rice ◽  
Nitrogen Application Rate

AbstractA field experiment employing the rice cultivars Qyou6 and Yixiangyou2115 as materials and different nitrogen application rates was conducted in Huangping County, Guizhou Province in 2019 to determine the effects of nitrogen application rate on photosynthetic pigments, leaf fluorescence characteristics, yield, and their interrelations in indica hybrid rice. The results showed that photosynthetic pigment contents generally increased with increasing nitrogen application rate. As the nitrogen rate increased, the maximal quantum yield of PSII (Fv/Fm), actual quantum yield of PSII (ΦPSII), and relative electron transfer rate at PSII (ETR) first decreased and then increased at the booting stage; Fv/Fm and ΦPSII decreased while ETR first increased and then decreased at the heading stage; nevertheless, Fv/Fm and ΦPSII first decreased and then increased but ETR was just the opposite at the maturity stage. Non-photochemical quenching coefficient (qN) and quantum yield of regulatory energy dissipation at PSII (Y(NPQ)) first increased and then decreased whereas quantum yield of non-regulatory energy dissipation at PSII (Y(NO)) first decreased and then increased at the booting, heading, and maturity stages with increasing nitrogen application rate. Photochemical quenching coefficient (qP) showed an increasing trend as the nitrogen rate increased in the range of 150–300 kg/ha at the heading and maturity stages. Photosynthetic pigments, leaf fluorescence characteristics, and yield and its components were significantly correlated. First, chlorophylls a and b were significantly negatively correlated with Fv/Fm while significantly positively correlated with qP at the heading stage. Secondly, Carotenoids were significantly positively correlated with the effective panicle number (EPN) at the booting stage while significantly negatively correlated with the spikelets per panicle (SPP) at the heading stage. Chlorophyll a and carotenoids were significantly positively correlated with EPN but significantly negatively correlated with spikelet filling (SF) at the maturity stage. In addition, qP was significantly negatively correlated with EPN at the booting stage. At the heading stage, Fv/Fm and Y(NO) were significantly negatively correlated with EPN and SPP, respectively, and Fv/Fm and ΦPSII were significantly positively related to SF. Moreover, qP was extremely significantly positively related to EPN whereas Fv/Fm was extremely significantly negatively correlated with grain yield at the maturity stage. Appropriate nitrogen application rates can enhance photosynthetic pigment contents, improve the photochemical efficiency and proportion of the open part of the reaction center of PSII, and promote the quantum efficiency and self-protection ability of PSII, thereby increasing photosynthetic efficiency and yield. Under the conditions adopted in this experiment, a parabolic relationship was observed between the nitrogen application rate and grain yield. The regression analysis results showed that the best nitrogen application rate of indica hybrid rice is 168.16 kg ha−1 and the highest yield is 11,804.87 kg ha−1.

Sign in / Sign up

Export Citation Format

Share Document