Distribution of fertiliser N among fixed ammonium fractions as affected by moisture and fertiliser source and rate

Gouveia, Gregory A.; Eudoxie, Gaius

doi:10.1007/s00374-007-0171-4

Cited by 21 publications

(14 citation statements)

References 22 publications

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“…However, there has not been any study that directly measured nutrient uptake and use efficiency. Different methods have traditionally been employed in investigating nutrient effects, but these are limited by priming effects [58]. Stable isotope techniques or other direct measurement protocols need to be employed to verify the effects of compost tea on nutrient uptake and use efficiency.…”

Section: Growth Development Crop Nutritional Status and Soil Fertilitymentioning

confidence: 99%

Compost Tea Quality and Fertility

Eudoxie¹,

Martin²

2019

Organic Fertilizers - History, Production and Applications

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The water extract of compost termed "compost tea" retains all the beneficial soluble bioactive components, making it a potent source of plant stimulatory and defensive compounds. The exact nature and extent of these features are, however, modified by composting system, feedstock quality, tea preparation and resultant use and management, including application dynamics of the compost tea. Compost teas contain a significant quantity of total nutrients with the majority being primary macronutrients. Secondary and micronutrient concentrations are more variable, but contents are generally insufficient to satisfy crop requirements. Noting this, compost tea use in agriculture and horticulture supports crop nutrition directly and indirectly. Improvements in soil quality have been widely reported for a range of soils and compost teas. A key feature of compost teaamended soils is the increase in soil organic matter and microbial diversity and its associated benefits. Research on appropriates rates for field and container use show large variability associated with edapho-climatic factors and crop species. However, foliar application seems best suited to maximising the dual nutrition and phytopathogenic effects of compost tea. Regardless of the purpose of compost tea use, its positive effects on crop growth and soil fertility, whilst controlling pest and disease, make it a contemporary sustainable tool aligned to organic agriculture.

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Section: Growth Development Crop Nutritional Status and Soil Fertilitymentioning

confidence: 99%

Compost Tea Quality and Fertility

Eudoxie¹,

Martin²

2019

Organic Fertilizers - History, Production and Applications

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“…The higher order three-way and four-way interactions of this factorial design were then confounded within the error term of the analysis of the variance of the variables measured. This allowed the main and two-way interaction effects, which were of greater significance in this study, to be assessed with a greater degree of precision [34].…”

Section: Experimental Treatments Design and Co 2 Flux Measurementmentioning

confidence: 99%

“…The sound management of nitrogen (N) in tropical soils is crucial, given that much of this element can become unavailable [34]. In the tropics, organic residues can serve as an important alternative N source to conventional fertilizers.…”

Section: Available Nitrogen In the Soilmentioning

confidence: 99%

Organic Residues and Ammonium Effects on CO2 Emissions and Soil Quality Indicators in Limed Acid Tropical Soils

2019

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Aglime (agricultural lime), commonly applied to acid soils to increase the soil pH and productivity, may lead to the release of CO2 into the atmosphere or to carbon (C) sequestration, although the processes involved are not fully understood. As large acreages of arable land are limed annually, exploring soil management practices that reduce aglime-induced CO2 emissions from acid soils while maintaining or improving the soil quality is paramount to mitigating the effects of global climate change. This study, therefore, assessed the effects of organic residues and ammonium on CO2 emissions and soil quality indicators in two limed soils. Two contrasting acid soils (Nariva series, Mollic Fluvaquents and Piarco series, Typic Kanhaplaquults) were amended with varying combinations of aglime (0% and 0.2% w/w CaCO3), organic residue (0% and 5% w/w biochar or poultry litter), and NH4-N (0% and 0.02% w/w) and were incubated in 300 mL glass jars for 31 days. The sampling for CO2 was performed on 11 occasions over the course of the incubation, while soil sampling was conducted at the end. The results indicate that aglime application significantly (p < 0.05) increased the cumulative CO2 emissions in all cases except with the addition of poultry litter. Alternatively, ammonium did not regulate the effect of aglime on CO2 emissions, which was l because of the low rate at which it was applied in comparison to aglime. The results also showed that poultry litter significantly (p < 0.05) increased the soil electrical conductivity (EC), available nitrogen (N), and pH, especially in the Piarco soil, while the hardwood biochar had little to no effect on the soil properties. Our findings indicate the potential for utilizing poultry litter to reduce the impact of aglime on CO2 emissions while improving the soil quality. Further studies utilizing 13C to trace aglime CO2 emissions are, however, required to identify the mechanism(s) that contributed to this reduction in the emissions.

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“…According to Osborne (1976b), NH 4 + fixation was reduced by 25% in a clay soil moistened to 60% of the maximum water holding capacity as compared with the dry soil. Also, Gouveia and Eudoxie (2007) found a lower NH 4 + fixation in wet soils. However, investigations in flooded rice soils yielded contradictory results.…”

Section: Influencing Factorsmentioning

confidence: 99%