Aggregate-associated soil organic carbon and total nitrogen following amendment of puddled andsawah-managed rice soils in southeastern Nigeria

Igwe, C. A.; Nwite, J. N.; Agharanya, Kingsley U.; Watanabe, Yayoi; Obalum, Sunday E.; Okebalama, Chinyere Blessing; Wakatsuki, Toshiyuki

doi:10.1080/03650340.2012.684877

Cited by 17 publications

(10 citation statements)

References 24 publications

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“…The consistently highest values of these three basic cations in RHA-amended plots would be largely explained by RHA's content of potassium, calcium and magnesium hydroxides (Lickacz, 2002). In a similar study in two inlandvalley soils in southeastern Nigeria with a similar set and source of soil amendments applied at the same rates as the present study, but with RHA of lower quality compared to the present study, the order was NPK > PD ≥ RHA for K + and PD > RHA ≥ NPK for Ca 2+ and Mg 2+ in the two locations (Igwe et al, 2013). These contrasting observations put together, we infer that the effects of RHA, relative to other organic and inorganic fertilizers, on plant-nutrient exchangeable bases in sawah-managed lowland soils would depend on the lowland type (inland valley or floodplain), quality of the RHA, and the basic cation of interest.…”

Section: Treatment Effects On Soil Contents Of Plant-nutrient Exchangsupporting

confidence: 63%

Manurial amendments and source of water for supplemental irrigation of sawah-rice system influenced soil quality and rice yield

Nnadi¹,

Ugwu²,

Nwite³

et al. 2021

Agro-Sci.

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Soil and water management research on adapting the promising sawah ecotechnology for lowland rice farming in West Africa has largely focused on the abundant inland valleys; floodplains which too represent a huge agricultural resource in the region have not been so involved. Sawah refers to a bunded, puddled and leveled basin for rice, with water inlets and outlets for irrigation and drainage, respectively. In conventional sawah, soil fertility is augmented using mineral fertilizers, with an option to harness lowland water resources for use in small-scale irrigation to create the so-called sawah typologies. In this study, we evaluated the effects of three manurial amendments (rice husk, rice-husk ash and poultry droppings, each at 10 t ha–1) and NPK 20:10:10 at 400 kg ha–1 interacting with source of water (spring or pond) used for supplemental irrigation of three sawah typologies in a floodplain in southeastern Nigeria. Plots amended with poultry droppings and supplemented with spring water recorded the overall best performance of the sawah-rice system; the control being the unamended non-supplemented (solely rainfed) plots recorded the worst. Rice-husk ash and rice husk enhanced soil pH and soil organic carbon, respectively. The three sawah typologies showed a consistent trend thus spring-supplemented ≥ pond-supplemented ≥ non-supplemented sawah. Rice grain yield was influenced by soil total nitrogen and the sum of the three plant-nutrient basic cations (K+ , Ca2+ and Mg2+), with the influence of K+ alone being the greatest. To enhance rice performance including grain yields in floodplain sawah, farmers should utilise poultry droppings as soil manure and spring water for supplemental irrigation.

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Section: Treatment Effects On Soil Contents Of Plant-nutrient Exchangsupporting

confidence: 63%

Manurial amendments and source of water for supplemental irrigation of sawah-rice system influenced soil quality and rice yield

Nnadi¹,

Ugwu²,

Nwite³

et al. 2021

Agro-Sci.

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“…Recommended conservation measures include avoidance of bush burning that is common in the area, drainage to reduce wetness, and liming to increase exchangeable Ca 2+ and Mg 2+ and reduce exchangeable Al 3+ . Also, use of organic soil amendments is suggested to replenish Ca 2+ and Mg 2+ (Nwite et al, 2012a), but more comprehensively, sawah-based soil and water management strategies which often involve input of organic materials could help to harness the wetness while improving nutrient retentive capacity (Nwite et al, 2012b;Obalum et al, 2012;Igwe et al, 2013).…”

Section: Land Capability Classification Of the Study Areamentioning

confidence: 99%

Capability groupings of some nun river floodplain soils of Bayelsa State, Southern Nigeria

Dickson¹,

Tate²,

Ogboin³

2022

Agro-Sci.

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Nine Nun River floodplain soils in Bayelsa State were evaluated using Land Capability Classification (LCC), Land Capability Index (LCI) and Fertility Capability Classification (FCC) systems. The LCC grouped most soil mapping units (SMUs) into class II except NDU3. Odi (ODI1), Koroama (KRM1) and Niger Delta University (NDU1) were grouped in IInf0; ODI2, KRM2 and NDU2 in IIwnf0; ODI3 and KRM3 in IIwnf1 and NDU3 in Vwnf3, respectively. Indicating suitability for wide range of arable crops. The LCI grouped ODI1, KRM1 and NDU1 in class II while ODI2, ODI3, KRM2, KRM3, NDU2 and NDU3, in class III for annual crops. For perennial crops, KRM1 and NDU1 were grouped in class II, ODI1, KRM2 and NDU2 in class III while ODI2, ODI3, KRM3 and NDU3, in class IV, respectively. The FCC grouped ODI1 in La- and ODI3 into Lga-e. On the other hand, KRM1 was grouped in La-e while KRM2, KRM3 and NDU3 in Lga-ek. The identified limiting fertility constraints were wetness, flooding, low exchangeable K+, Ca2+ and Mg2+ concentration, soil acidity as promoted by Al3+ toxicity, texture and drainage. LCI and FCC identified texture as a major constraint with LCI placing emphasis on soil colour while FCC identified K+ deficiency as a limitation. Wetness, flooding, low nutrient capital of exchangeable K+, Ca2+ and Mg2+, soil acidity and Al3+ toxicity, texture and drainage were key to land evaluation in the study area. Flood control, improved drainage, liming and adequate fertilization practices including organic matter conservation should be adopted for improved land management.

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“…Though the reason the suppressed effect of 10 g pot −1 for 8 and 12 WOI is not clear, it should be recalled that both the soil studied and RHB had fairly high CN ratios of 17.14 and 18.31, respectively (Tables 1 and 2). The value for RHB is plausibly a reflection of its feedstock (rice husk) with a high CN ratio > 47 (Adubasim et al, 2018;Igwe et al, 2013). The CN ratio of RHB was much lower than that of its feedstock.…”

Section: Discussionmentioning

confidence: 96%

Rice-husk biochar effects on organic carbon, aggregate stability and nitrogen-fertility of coarse-textured Ultisols evaluated using Celosia argentea growth

Ebido

Edeh

Unagwu

et al. 2021

Sains Tanah J. Soil Sci. Agroclimatology

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There are insufficient data supporting the enormous potential of biochar in highly weathered tropical soils. This glasshouse study assessed rice-husk biochar (RHB) effects on soil organic carbon, aggregate stability and nitrogen fertility of sandy-loam Ultisols which were evaluated using spinach (Celosia argentea) growth. Five RHB rates 0, 5, 10, 20, and 40 g per two-kg-soil (0, 7.5, 15, 30 and 60 t ha−1, respectively) were studied under 0, 4, 8, and 12 weeks of incubation (WOI). Batched potting of treatments enabled sowing on one date. Treatment effects on soil quality were assessed at sowing and spinach growth six weeks later. Soil organic carbon generally increased with RHB rate, with the greatest increments (37%) in maximum rate relative to no-biochar control for 8 WOI. Aggregate stability also generally increased with RHB rate, the range being 7.21%-17.21% for 8 WOI, beyond which it decreased in 10 and 20 but not 40 g pot–1. Total nitrogen was always highest in maximum rate, increasing with rate only for 8 WOI. Treatment affected plant height more clearly than leaf count. Optimum rates were 5 or 10 g pot–1 for 8 and 4 WOI, respectively (plant height) and 10 g pot–1 for 8 WOI (leaf count). Soil organic carbon influenced soil aggregate stability (R2 = 0.505) which in turn was quadratically related to plant height (R2 = 0.517), indicating stability threshold for spinach. Adding RHB at 40 g pot–1 (≈ 60 t ha−1) to coarse-textured tropical soils is suggested to sustain its soil aggregating effect beyond the growth phase of short-cycle leafy vegetables which require a lower rate (10 g pot–1) 8 weeks before sowing. The observed role of soil aggregate stability in spinach growth rather than the overall effects of RHB should guide further search for edapho-agronomic optimum rate of RHB.

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Aggregate-associated soil organic carbon and total nitrogen following amendment of puddled andsawah-managed rice soils in southeastern Nigeria

Cited by 17 publications

References 24 publications

Manurial amendments and source of water for supplemental irrigation of sawah-rice system influenced soil quality and rice yield

Manurial amendments and source of water for supplemental irrigation of sawah-rice system influenced soil quality and rice yield

Capability groupings of some nun river floodplain soils of Bayelsa State, Southern Nigeria

Rice-husk biochar effects on organic carbon, aggregate stability and nitrogen-fertility of coarse-textured Ultisols evaluated using Celosia argentea growth

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