Effects of Litter and Fine Root Composition on Their Decomposition in a Rhodic Paleustalf under Different Land Uses

Jalota, Rajesh K.; Dalal, Ram C.; Harms, Ben; Page, Kathryn; Mathers, Nicole; Wang, Weijin

doi:10.1080/00103620600767108

Cited by 24 publications

(22 citation statements)

References 22 publications

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“…Moreover, GWC also had higher lignin concentration and higher lignin:N ratio than FLM. High lignin concentration in organic materials slows its decomposition (Fox et al, 1990;Jalota et al, 2006). Thus, GWC with high C:N ratio favoured immobilisation of mineral N and high lignin concentration and high lignin:N ratio slowed organic N decomposition resulting in reduced mineral N in the soil.…”

Section: Manure N Release Under Field Conditions and Sorghum Grain Yieldmentioning

confidence: 99%

“…These short-term potential N 2 O reduction benefits using GWC are supported by the current field study where GWC reduced annual N 2 O emission rate by 33% from the control soil and by 56% from the soil amended with equal amounts of FLM and GWC compared to FLM alone. While, higher C:N ratio favours immobilisation, higher lignin concentration reduces N mineralisation (Fox et al, 1990;Jalota et al, 2006). Besides the higher C:N ratio of GWC than FLM, it also had higher lignin concentration, and therefore, the combined effect of high C:N ratio and lignin concentration and lignin:N ratio of GWC not only reduced NO 3 -N in the soil but it also reduced N 2 O emission rate from the GWC-amended soil as well as from the soil amended with FLM.…”

Section: Manure N Release Under Field Conditions and Sorghum Grain Yieldmentioning

confidence: 99%

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Green waste compost reduces nitrous oxide emissions from feedlot manure applied to soil

Dalal

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Allen

et al. 2010

Agriculture, Ecosystems & Environment

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Section: Manure N Release Under Field Conditions and Sorghum Grain Yieldmentioning

confidence: 99%

Section: Manure N Release Under Field Conditions and Sorghum Grain Yieldmentioning

confidence: 99%

Green waste compost reduces nitrous oxide emissions from feedlot manure applied to soil

Dalal

Gibson

Allen

et al. 2010

Agriculture, Ecosystems & Environment

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“…The N release from organic amendments is positively related to material's initial quality [10,102]. In early stages of organic amendments decomposition, C/N ratio may be the best predictor of N release [108], while lignin indices become increasingly important in later stages of decomposition [10,48]. The differences in initial organic amendments quality (lignin/N and lignin/cellulose) alter material decomposition and N release rates in the early stages of litter decomposition [70].…”

Section: Quality Of Organic Amendments On Nitrogen Mineralization In mentioning

confidence: 99%

“…The litter decomposition rates and N release may also be related inversely to lignin and N-based estimates of initial litter quality. For example, high N content may actually retard litter decomposition rates later in the decomposition process, particularly if lignin levels are also high [11,48].…”

Section: Biochemical Properties Of Organic Amendmentsmentioning

confidence: 99%

How Important is the Quality of Organic Amendments in Relation to Mineral N Availability in Soils?

et al. 2013

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Summary Wastes generated from municipal and agricultural activities have the tremendous potential for application in agriculture as a source of nutrients and as amendments to improve soil organic matter (SOM). A decline in SOM can represent a serious threat to soil fertility and quality. Nitrogen (N) mineralization from organic amendments is important for understanding the N dynamics in terrestrial ecosystems. In this review, quality of the amendments such as C/N ration, N content, and biochemical compositions, etc. are discussed. Since, C/N ratio cannot explain all differences in N mineralization; emphasis has been laid on characterizing different compounds in organic amendments that govern the mineralization process. The importance of simulation models has also been described in modeling N mineralization from some complex materials like compost, animal manures and farmyard manures. These complex simulation models once modified according to the quality of the organic amendments can simulate N mineralization and thus, they can be used for simulating N dynamics in terrestrial eco-systems.

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“…In early stages of decomposition, C/N ratio may be the best predictor of N release (Taylor et al, 1989), while lignin indices are important in later stages of decomposition (McClaugherty and Berg, 1987;Jalota et al, 2006). According to Melillo et al (1989), differences in initial organic material quality (lignin/N and lignin/cellulose) govern the decomposition and N mineralisation rate in the early stages of decomposition.…”

Section: Influences Of the Quality Of Organic Amendments On Nitrogen mentioning

confidence: 99%

Simulation of nitrogen release from organic materials in the soybean/wheat cropping systems on Vertisols in central India

Mohanty¹

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The soybean (Glycine max L.)-wheat (Triticum aestivum, L.) cropping system is the dominant cropping system on Vertisols of Madhya Pradesh in central India, but the yield of soybean has been decreased significantly over recent years due to biotic and abiotic factors. The yield of wheat following soybean in this region is also governed by the availability of irrigation water. So managing this cropping system in terms of nutrient and water in Vertisols is important for soybean and wheat production. The proposed research work was undertaken to analyze N release from different organic materials like rice (Oryza sativa, L.) and wheat straw, green manure (like Gliricidia) and farmyard manure (FYM), modeling N release using APSIM (Agricultural Production System Simulator). The APSIM model has been calibrated for first time for Indian FYM, and also tested for the soybeanwheat cropping system permitting prediction of N release from organic amendments varying in C/N ratios and biochemical properties.A laboratory incubation experiment was carried out for 98 days at 30º C under aerobic conditions to study the effects of rice and wheat straw applied at 5 and 10 g kg -1 to a Vertisol soil in the presence or absence of additional N (as urea). The study showed an interactive effect between the rate of application of the residues and additional mineral N.Without additional N, the mineral N in soil was completely immobilised within two weeks, irrespective of the rate of application; initial net immobilisation was limited by the availability of N and was independent of residue rate. When additional N was supplied, initial net immobilisation was dependent on the rate of application of the residue.We used the APSIM SoilN module to simulate N mineralisation from high C/N ratio crop residues, and compared the predictions with the observed data from our incubation study and other published data sets. Model performance was generally satisfactory with a modelling efficiency of 0.82. The major discrepancy between the modelled and the observed data was a tendency for the model to underestimate the initial rate of immobilisation. iii the model based on the FYM composition. Water soluble C and N components were used to specify the conceptual pool FPOOL1 and the measured lignin content to specify the C content of FPOOL3. Using these values and an iterative approach to identifying an Application of

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Effects of Litter and Fine Root Composition on Their Decomposition in a Rhodic Paleustalf under Different Land Uses

Cited by 24 publications

References 22 publications

Green waste compost reduces nitrous oxide emissions from feedlot manure applied to soil

Green waste compost reduces nitrous oxide emissions from feedlot manure applied to soil

How Important is the Quality of Organic Amendments in Relation to Mineral N Availability in Soils?

Simulation of nitrogen release from organic materials in the soybean/wheat cropping systems on Vertisols in central India

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