Soil organic carbon and nitrogen stocks in Nepal long-term soil fertility experiments

Gami, Sanjay K.; Lauren, J. G.; Duxbury, J. M.

doi:10.1016/j.still.2009.10.003

Cited by 73 publications

(35 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Soil bulk density was significantly lower in two compost treatments than in the control treatment, as was consistent with the other report (Gami et al, 2009); however, it was contrasted to the result of Nayak et al (2012). Rasool et al (2007) observed that soil bulk density was significantly decreased in organic fertilizer treatments, but there had nonsignificant difference between chemical fertilizer and control treatment in paddy field, as was consistent with our results.…”

Section: Soil Nutrients Soil Ph and Bulk Densitysupporting

confidence: 92%

“…Soil total N sequestration rate was significantly higher in two compost treatments than in the chemical fertilizer and control treatments. Similarly, Gami et al (2009) observed that soil total N stock was significantly higher in farmyard manure treatment than in NPK and unfertilized treatments in Nepal. Gong et al (2011) revealed that soil organic N sequestration was significantly higher in organic fertilizer treatment than in inorganic fertilizer treatment and control in the North China Plain.…”

Section: Discussionmentioning

confidence: 75%

See 1 more Smart Citation

Soil carbon and nitrogen sequestration and crop growth as influenced by long-term application of effective microorganism compost

Xia

Chen

et al. 2018

Chil. j. agric. res.

View full text Add to dashboard Cite

Long-term excessive application of inorganic fertilizers not only wastes resources but also contaminates the environment. The use of natural substitutes could overcome these drawbacks. We hypothesize that organic fertilizers could increase soil C, N sequestration and improve soil fertility more effectively than inorganic fertilizers, and that in particular effective microorganism (EM) could improve the effects of traditional compost. So, a long-term field experiment regarding improvement of soil fertility, protecting soil environment, and increasing of maize and wheat yield was conducted at China Agricultural University's Qu-Zhou experiment station since 1993. Field experiment included EM compost treatment, traditional compost treatment, chemical fertilizer treatment, and unfertilized treatment. Soil organic C (SOC), total N, nutrient concentrations, pH, bulk density, and crop yields were determined. The results revealed that long-term repeated application of EM compost promoted soil C and N sequestration, increased soil nutrient contents, decreased soil pH and bulk density, enhanced crop yields in contrast to chemical fertilizer and control treatment. Soil organic C stocks (0-20 cm) were increased by 87.32%, 81.51%, 33.05%, 25.20% and soil total N stocks were increased by 93.26%, 77.53%, 37.64%, 34.83% in contrast to initial values in EM compost, traditional compost, chemical fertilizer and control treatments, respectively. Moreover, maize grain yields in EM compost, traditional compost, and chemical fertilizer treatments were significantly increased by 163.49%, 128.34%, 62.36% compared with control treatment, respectively. The effect of increased soil C and N sequestration, improving soil fertility and enhanced crop yields in application of compost appending EM was better than alone application of compost.

show abstract

Section: Soil Nutrients Soil Ph and Bulk Densitysupporting

confidence: 92%

Section: Discussionmentioning

confidence: 75%

Soil carbon and nitrogen sequestration and crop growth as influenced by long-term application of effective microorganism compost

Xia

Chen

et al. 2018

Chil. j. agric. res.

View full text Add to dashboard Cite

show abstract

“…Gami et al [32] also reported a significant increase in SOC stocks to 60 cm depth under three 23–25-year-old long-term fertility experiments in the Nepal, with application of manure and inorganic fertilizer. Within 1 m soil depth, the cumulative distribution of SOC in the CK, N, NP, FYM, NP+S and NP+FYM treatments were by 50%, 46%, 51%, 53%, 54% and 55% in the 0–40 cm layer, and 68%, 68%, 71%, 72%, 73% and 74% in the 0–60 cm layer, respectively.…”

Section: Discussionmentioning

confidence: 90%

Long-Term Effect of Manure and Fertilizer on Soil Organic Carbon Pools in Dryland Farming in Northwest China

et al. 2013

View full text Add to dashboard Cite

An understanding of the dynamics of soil organic carbon (SOC) as affected by farming practices is imperative for maintaining soil productivity and mitigating global warming. The objectives of this study were to investigate the effects of long-term fertilization on SOC and SOC fractions for the whole soil profile (0–100 cm) in northwest China. The study was initiated in 1979 in Gansu, China and included six treatments: unfertilized control (CK), nitrogen fertilizer (N), nitrogen and phosphorus (P) fertilizers (NP), straw plus N and P fertilizers (NP+S), farmyard manure (FYM), and farmyard manure plus N and P fertilizers (NP+FYM). Results showed that SOC concentration in the 0–20 cm soil layer increased with time except in the CK and N treatments. Long-term fertilization significantly influenced SOC concentrations and storage to 60 cm depth. Below 60 cm, SOC concentrations and storages were statistically not significant between all treatments. The concentration of SOC at different depths in 0–60 cm soil profile was higher under NP+FYM follow by under NP+S, compared to under CK. The SOC storage in 0–60 cm in NP+FYM, NP+S, FYM and NP treatments were increased by 41.3%, 32.9%, 28.1% and 17.9%, respectively, as compared to the CK treatment. Organic manure plus inorganic fertilizer application also increased labile soil organic carbon pools in 0–60 cm depth. The average concentration of particulate organic carbon (POC), dissolved organic carbon (DOC) and microbial biomass carbon (MBC) in organic manure plus inorganic fertilizer treatments (NP+S and NP+FYM) in 0–60 cm depth were increased by 64.9–91.9%, 42.5–56.9%, and 74.7–99.4%, respectively, over the CK treatment. The POC, MBC and DOC concentrations increased linearly with increasing SOC content. These results indicate that long-term additions of organic manure have the most beneficial effects in building carbon pools among the investigated types of fertilization.

show abstract

“…For example, concentration of STN increased downslope from the upland to the lowland in a study in the Pyrenees (Navas et al, 2012). Within pedons, the concentration of STN may decrease or increase with depth, depending on the concentration of SOC (Gami et al, 2009).…”

mentioning

confidence: 99%

Soil Carbon and Silicon Pools across a Drained Catena in Central Ohio, USA

Ibrahim

Lal

2014

Soil Horizons

View full text Add to dashboard Cite

For millennia, humans have impacted soil formation and altered soil properties. Wetlands were extensively drained in the United States during the last 200 years for agricultural purposes, which affected the environment, passively. Thus, this study focused on assessment of soil C (organic and inorganic) and Si pools across a drained catena encompassing all landscape positions. Soil samples were collected from all landscape positions and analyzed for physical and chemical properties. Soil bulk density of the surface horizons decreased downslope from 1.65 Mg m–3 at the summit to 1.44 Mg m–3 at the toeslope. At the lowland, the artificial internal drainage caused a substantial loss of soil organic carbon (SOC) and converted the Histosol (https://soilseries.sc.egov.usda.gov/OSD_Docs/C/CARLISLE.html series) to a Mollisol (https://soilseries.sc.egov.usda.gov/OSD_Docs/K/KOKOMO.html series). Soil total carbon (STC) of the surface horizons increased downslope from 1.24% at the summit to 4.6% at the toeslope. Soil organic carbon followed the same trend as that of STC across the landscape. Soil inorganic carbon (SIC) occurred in the lower horizons of the summit and shoulder (∼4%) and in the surface horizon of the toeslope (0.1%). Amorphous Si (ASi) and plant available Si (PASi) concentrations generally increased downslope across the soil catena and increased downward within pedons. Concentration of ASi increased from 312 to 341 mg kg–1, and PASi increased from 56 to 94 mg kg–1 for the surface horizons at the summit and toeslope, respectively. Soil pH ranged from 6.6 to 7.5 for the surface horizons at the footslope and shoulder positions, respectively.

show abstract

Soil organic carbon and nitrogen stocks in Nepal long-term soil fertility experiments

Cited by 73 publications

References 35 publications

Soil carbon and nitrogen sequestration and crop growth as influenced by long-term application of effective microorganism compost

Soil carbon and nitrogen sequestration and crop growth as influenced by long-term application of effective microorganism compost

Long-Term Effect of Manure and Fertilizer on Soil Organic Carbon Pools in Dryland Farming in Northwest China

Soil Carbon and Silicon Pools across a Drained Catena in Central Ohio, USA

Contact Info

Product

Resources

About