Indigenous Nitrogen Supply of Rice Is Predicted by Soil Organic Carbon

Espe, Matthew B.; Kirk, Emilie R.; Kessel, Chris van; Horwath, W. R.; Linquist, Bruce A.

doi:10.2136/sssaj2014.08.0328

Cited by 23 publications

(16 citation statements)

References 23 publications

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“…For instance, Cui et al [17] estimated that soil N supply was increased by 5.37 kg/ha for each g/kg SOM during summer maize season and by 3.68 and 9.76 kg/ha during winter wheat season for low and high yielding fields, respectively, in the North China plain. Espe et al [18] estimated a linear effect of 1.44 kg/ha for every g/kg increase in SOC for rice on organic soils. However, Cassman et al [30] observed a poor correlation between indigenous N supply and SOC in the rice systems, and attributed the N content to the N inputs from sources other than SOM mineralization, degree of congruence between soil N supply and crop demand, and differences in SOM quality.…”

Section: Discussionmentioning

confidence: 99%

“…However, Cassman et al [30] observed a poor correlation between indigenous N supply and SOC in the rice systems, and attributed the N content to the N inputs from sources other than SOM mineralization, degree of congruence between soil N supply and crop demand, and differences in SOM quality. Obviously, the N supply from SOM mineralization would vary substantially, and it should be incorporated into other fertilization recommendation strategies such as site-specific nutrient management in a given region having similar soil properties, climate, and crop management [18].…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, it is difficult to predict the overall effect of SOM on crop productivity and to identify and quantify which attributes of SOM contribute to this effect. Among many attributes, the contribution of SOM to the supply of indigenous nutrients for plant growth by mineralization is one of the important aspects that affects crop yields [17,18], but this effect might be confused with applied mineral nutrients. The crop yield under no-fertilization, defined as inherent soil productivity, can reflect the primary capacity of soil itself for food production [19].…”

Section: Introductionmentioning

confidence: 99%

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Increasing Soil Organic Matter Enhances Inherent Soil Productivity while Offsetting Fertilization Effect under a Rice Cropping System

Zhao

Huang

et al. 2016

Sustainability

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Understanding the role of soil organic matter (SOM) in soil quality and subsequent crop yield and input requirements is useful for agricultural sustainability. SOM is widely considered to affect a wide range of soil properties, however, great uncertainty still remains in identifying the relationships between SOM and crop yield due to the difficulty in separating the effect of SOM from other yield-limiting factors. Based on 543 on-farm experiments, where paired treatments with and without NPK fertilizer were conducted during 2005-2009, we quantified the inherent soil productivity, fertilization effect, and their contribution to rice yield and further evaluated their relationships with SOM contents under a rice cropping system in the Sichuan Basin of China. The inherent soil productivity assessed by rice grain yield under no fertilization (Y-CK) was 5.8 t/ha, on average, and contributed 70% to the 8.3 t/ha of rice yield under NPK fertilization (Y-NPK) while the other 30% was from the fertilization effect (FE). No significant correlation between SOM content and Y-NPK was observed, however, SOM content positively related to Y-CK and its contribution to Y-NPK but negatively to FE and its contribution to Y-NPK, indicating an increased soil contribution but a decreased fertilizer contribution to rice yield with increasing SOM. There were significantly positive relationships between SOM and soil available N, P, and K, indicating the potential contribution of SOM to inherent soil productivity by supplying nutrients from mineralization. As a result, approaches for SOM accumulation are practical to improve the inherent soil productivity and thereafter maintain a high crop productivity with less dependence on chemical fertilizers, while fertilization recommendations need to be adjusted with the temporal and spatial SOM variation.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Increasing Soil Organic Matter Enhances Inherent Soil Productivity while Offsetting Fertilization Effect under a Rice Cropping System

Zhao

Huang

et al. 2016

Sustainability

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“…The experiment was embedded in an N rate trial across a gradient of SOC (Espe et al, 2015). Three sites with contrasting SOC (6, 11, and 23%) were selected for this study with the distance between each site less than 1.25 km.…”

Section: Experimental Design and Field Setupmentioning

confidence: 99%

“…Only two rates (0 and 80 kg N ha À1 ) were chosen for this study. The 80 kg N ha À1 was chosen as it was the highest recommended N rate for rice production in this range of SOC contents (Espe et al, 2015). All sites were managed the same throughout the entire season.…”

Section: Experimental Design and Field Setupmentioning

confidence: 99%

Nitrous oxide uptake in rewetted wetlands with contrasting soil organic carbon contents

Horwáth

2016

Soil Biology and Biochemistry

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a b s t r a c tRewetting drained peatlands creates favorable reduced conditions for denitrification, but, the potential of restored peatlands to act as N 2 O sink is poorly characterized. We monitored N 2 O emissions in rewetted peatlands converted to rice paddies with a range of soil organic carbon (SOC) (6%, 11%, and 23%) during the growing season. Negative N 2 O emissions were repeatedly observed in all sites, which were not affected by nitrogen fertilization at 80 kg N ha À1 . The highest consumption rates amounted to 8.2 tones CO 2 eq ha À1 yr À1 , 32% of the average CO 2 emissions from drained peat soils. Porewater N 2 O concentrations were frequently less than the calculated in situ N 2 O equilibrium concentrations, suggesting diffusional constraints on atmospheric N 2 O into pore water. Redox potentials were correlated to N 2 O emission rates (r 2 ¼ 0.40, p < 0.01). However, relatively higher frequencies and magnitudes of negative N 2 O emissions were mostly observed during the period of water draw down for rice harvest activities, especially in the field with the highest SOC. It is likely that reducing water depth by drainage reduced the diffusional barrier for atmospheric N 2 O into the soil. In all, the capacity of rewetted peatlands to act as atmospheric N 2 O sinks can be significant and seemingly can be managed through manipulating water depths.

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Greenhouse Gas Emissions in Wetland Rice Systems

Horwáth

2022

Multi‐Scale Biogeochemical Processes in Soil Ecosystems

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Indigenous Nitrogen Supply of Rice Is Predicted by Soil Organic Carbon

Cited by 23 publications

References 23 publications

Increasing Soil Organic Matter Enhances Inherent Soil Productivity while Offsetting Fertilization Effect under a Rice Cropping System

Increasing Soil Organic Matter Enhances Inherent Soil Productivity while Offsetting Fertilization Effect under a Rice Cropping System

Nitrous oxide uptake in rewetted wetlands with contrasting soil organic carbon contents

Greenhouse Gas Emissions in Wetland Rice Systems

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