Physicochemical properties of an acid ultisol subjected to different tillage practices and wood-ash amendment: Impact on heavy metal concentrations in soil and Castor plant

Nnadi, Ernest O.; Mbah, C. N.; Nweke, Anselen; Njoku, C.

doi:10.1016/j.still.2019.06.005

Cited by 8 publications

(3 citation statements)

References 27 publications

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“…The implication of the result is that without further application of the rice mill ash reasonable yield of maize can still be obtained. Nnadi et al [15], made similar observation in a 3 years study of wood ash and tillage methods when they found out that wood ash has strong residual effect on castor yield and yield components. The pod yield result showed non-significant effect of soybean intercropped with maize with considerable reduction in pod yield in intercrop relative to sole and amended crop of which quantitatively the plot amended with 10 t/ha RMA gave the highest value.…”

Section: Discussionmentioning

confidence: 63%

The residual effect of different levels of rice mill ash on maize-soybean intercrop

Nweke¹,

Okenmuo²,

AC³

et al. 2022

World J. Adv. Res. Rev.

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A two year (2013 and 2014) field trial was conducted to study the residual effect of different fertility levels of rice mill ash (RMA) on maize-soybean intercrop. The experiment was arranged in a randomized complete block design (RCBD) comprising of nine (9) treatments and three (3) replications. The treatments where sole maize (SMO), sole soybean (SBO), maize/soybean intercrop without application of rice mill ash (IMBO), soybean + 10 t/ha rice mill ash (SB10), sole maize + 10 t/ha rice mill ash (SM10), maize - soybean intercrop + 10 t/ha rice mill ash (IMB10), sole maize + 20 t/ha rice mill ash (SM20); sole soybean + 20 t/ha rice mill ash (SB20) and maize/soybean intercrop + 20 t/ha rice mill ash (IMB20). Data generated was subjected to analysis of variance of which the result of the study showed that for 2 years under study, incorporated rice mill ash (RMA) and intercropping system significantly increased the soil productivity, yield and yield components of maize and soybean studied. The RMA at the rate of 20t/ha performed competitively better than the other treatments with strong residual impact on the parameters assessed. Findings from the study equally showed an intercrop advantage.

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Section: Discussionmentioning

confidence: 63%

The residual effect of different levels of rice mill ash on maize-soybean intercrop

Nweke¹,

Okenmuo²,

AC³

et al. 2022

World J. Adv. Res. Rev.

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“…Indeed, wood ash has a high nutrient content (Aronsson and Ekelund 2004), can reduce soil acidity (Reid and Watmough 2014) and contributes to the concept of circular bioeconomy as wood ash returns some of the nutrients that were exported by the removal of logging residues (Pitman 2006). On the other hand, applying wood ash might contaminate ecosystems because of its relatively high content in several micronutrients or non-essential metals (Vance 1996;Nnadi et al 2019). However, other studies conclude that, based on the metal content of wood ash, a single application per forest rotation may not result in a significant increase in soil metal content and might even improve the micronutrient status of trees (Pitman 2006).…”

Section: Introductionmentioning

confidence: 99%

Response of soil and vegetation in a warm-temperate Pine forest to intensive biomass harvests, phosphorus fertilisation, and wood ash application

Augusto

Nguyen

et al. 2022

Science of The Total Environment

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“…Indeed, wood ash has a high nutrient content (Aronsson and Ekelund 2004), can reduce soil acidity (Reid and Watmough 2014), and contributes to the concept of circular bioeconomy as wood ash returns some of the nutrients that were exported by the removal of logging residues (Pitman 2006). On the other hand, applying wood ash might contaminate ecosystems because of its relatively high content in several micronutrients or non-essential metals (Vance 1996; Nnadi et al 2019). Unfortunately, while several meta-analyses have been carried out on intensive biomass harvests (Thiffault et al 2011; Achat et al 2015a) or wood ash application (Augusto et al 2008a; Reid and Watmough 2014), a combination of these two practices have rarely been studied together to assess their interactive consequences (Hagerberg and Wallander 2002; Wang et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Response of soil and vegetation in a warm-temperate Pine forest to intensive biomass harvests, phosphorus fertilisation, and wood ash application

Augusto

Nguyen

et al. 2021

Preprint

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Background and Aims: Concerns about climate change and carbon economy have prompted the promotion of alternative energy sources, including forest-based bioenergy. An evaluation of the environmental consequences of intensive harvests (stumps and roots, and also branches and foliage) for energy wood supply, and use of wood-ash recycling as a compensatory practice, helps in the analysis of the use of forest biomass for energy production. Methods: After 11 years, we made use of records from a split-plot experimental site crossing four different intensities of Biomass Harvesting (Stem-Only Harvest [SOH], Aboveground Additional Harvest [AAH], Belowground Additional Harvest [BAH], and Whole-Tree Harvest [WTH]) and three Compensation Methods (control [C], wood ash application [A] and phosphorus fertilisation [P]) to evaluate their effects on tree growth, soil fertility, chemical properties and soil carbon. This site is located in a maritime pine forest on a poor soil, under a warm temperate climate (SW France). Key results: Despite their low additional biomass exports (+10% for AAH to +34% for WTH), the non-conventional harvest practices exported much higher quantities of nutrients than the conventional SOH technique (for example +145% for N and K in WTH). Consequently, these treatments had several effects on the soil nutritive status. Additional biomass harvests impacted the soil organic matter content, with negative effects on P-organic and soil cation exchange capacity. However, data suggested that tree growth and foliage nutrient content had not yet been significantly impacted by harvest treatments, whereas tree nutritional status was improved by P-fertiliser or wood ash. As expected, we observed a positive effect of wood ash application on soil acidity and nutrient content but, like additional harvests, wood ash application decreased the pool of soil organic carbon (~10% of the initial stock with ~7% of N-total losses). Conclusions: Overall, this factorial experiment showed that exporting more forest biomass due to the additional harvesting of tree canopies, stumps and roots had negative consequences on the ecosystem. Additional harvests have aggravated the poverty of the already oligotrophic soil, which in turn may decrease tree growth and the soil organic carbon content in the future (but without any impact on either soil acidity or on trace metal contents). Importantly, applying nutrients as fertiliser or wood ash did not compensate for the negative impact of biomass exports and the method of wood ash recycling in forests could even decrease the soil organic carbon.

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Physicochemical properties of an acid ultisol subjected to different tillage practices and wood-ash amendment: Impact on heavy metal concentrations in soil and Castor plant

Cited by 8 publications

References 27 publications

The residual effect of different levels of rice mill ash on maize-soybean intercrop

The residual effect of different levels of rice mill ash on maize-soybean intercrop

Response of soil and vegetation in a warm-temperate Pine forest to intensive biomass harvests, phosphorus fertilisation, and wood ash application

Response of soil and vegetation in a warm-temperate Pine forest to intensive biomass harvests, phosphorus fertilisation, and wood ash application

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