soil nitrogen Articles
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Influence of maturity at harvest, N fertiliser and postharvest storage on dry matter, ascorbic acid and β-carotene contents of vegetable amaranth ( Amaranthus hypochondriacus )
Vegetable amaranth is a leafy vegetable traditionally grown in sub-Saharan Africa and Asia where it is the most consumed traditional vegetable. It is considered to have high nutritional quality, containing relatively large amounts of vitamins A and C. We have assessed the influence of the maturity of the vegetable and soil nutrition on the visual and nutritional quality of amaranth. We found ...
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Direct steam distillation as an alternative to the illinois soil nitrogen test
Development of the Illinois Soil N Test (ISNT) has rejuvenated the search for a soil-based N test to measure potentially mineralizable soil N. Accurate quantification of amino sugar N has been achieved using the ISNT, but issues concerning sample variability and analysis time have led to the discovery of a 10 mol L–1 NaOH direct steam distillation (DSD) procedure. Our primary objective was to ...
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Abiotic nitrate retention in agroecosystems and a forest soil
Agricultural ecosystems are the primary source of nitrate (NO3–) pollution in many watersheds. We used a laboratory 15N tracer study with live and gamma irradiated soils to examine the role of land management in abiotic retention of NO3– in three agroecosytems and a forest soil. Nitrogen retention was defined as the quantity of 15N that remained in soil following salt extractions. Land management ...
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Influence of maturity at harvest, N fertiliser and postharvest storage on dry matter, ascorbic acid and β-carotene contents of vegetable amaranth (Amaranthus hypochondriacus)
Vegetable amaranth is a leafy vegetable traditionally grown in sub-Saharan Africa and Asia where it is the most consumed traditional vegetable. It is considered to have high nutritional quality, containing relatively large amounts of vitamins A and C. We have assessed the influence of the maturity of the vegetable and soil nutrition on the visual and nutritional quality of amaranth. We found that ...
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Soil nitrogen mineralization and microbial biomass relation, and nitrogen conservation in humid-tropics
The reciprocal relationship between microbial biomass C (MB-C) and net nitrification in the seasonally dry tropics can reduce nitrate (NO3–) leaching losses, and be regarded as a mechanism of N conservation. The objective of the present study was to determine the influence of high seasonally prolonged rainfall on water-filled pore space (WFPS), net-nitrification rates (NNR), net-ammonification ...
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Glyphosate and AMPA chronic risk assessment for soil biota
Glyphosate is a broad‐spectrum herbicide used widely in agriculture, horticulture, private gardens and in public infrastructure, where it is applied to areas such as road sides, railway tracks and parks to control the growth of weeds. The exposure risk from glyphosate and the primary soil metabolite aminomethylphosphonic acid (AMPA) on representative species of earthworms, springtails, ...
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Controlling Nitrogen with Clinoptilolite
With skyrocketing prices on the fertilizer market, and record high contamination levels in runoff from soil leaching, solutions for fixing nutrients in the root zone are of paramount importance. The price of nitrogen fertilizer is always in flux, but as of recently there is a distinct and obvious spike. Fertilizer prices are on the rise. Meanwhile the broad use of fertilizer in agriculture has ...
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Animal and pasture productivity of ‘coastal’ and ‘tifton 44’ bermudagrass at three nitrogen rates and associated soil nitrogen status
Coastal’ and ‘Tifton 44’ (T44) bermudagrass [Cynodon dactylon (L.) Pers.] are well adapted across the lower southern United States, but the grazing response of (T44) to N application in the Piedmont of the upper South warrants further evaluation. This 3-yr experiment compared animal and pasture productivity of Coastal and T44 with three annual N rates of 101, 202, and 303 kg of N ha–1 on a Cecil ...
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Organic amendment history and crop rotation effects on soil Nitrogen mineralization potential and soil Nitrogen supply in a potato cropping system
Crop management practices influence readily and potentially available N in soil. In this study, we evaluated the effects of organic amendment history and crop rotation on potentially mineralizable N (N0), mineralizable N pools, and field estimates of soil N supply in potato (Solanum tuberosum L.) production, and evaluated a suite of N availability measures to detect changes in these parameters. ...
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The sanitation and urban agriculture nexus: urine collection and application as fertilizer in São Paulo, Brazil
Separately collected urine is an attractive potential fertilizer because of its high nutrient content, low cost, and inherent linkage of urban wastewater management and peri-urban agriculture. Urine from waterless urinals was applied to corn and lettuce plants to examine the impact of urine application rates and frequency on plant growth and soil parameters. In both corn and lettuce ...
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Spatial variability of the Illinois soil nitrogen test: Implications for sampling in a turfgrass system
Nitrogen fertilization of turfgrass continues to be scrutinized due to environmental concerns. Practices that reduce fertilizer inputs without sacrificing turfgrass quality are needed, but a reliable test of N status in turfgrass is not currently available. The Illinois soil N test has been developed to predict crop response to applied N by measuring the amount of amino sugar N in the soil. Amino ...
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Synthetic nitrogen fertilizers deplete soil nitrogen: a global dilemma for sustainable cereal production
Received for publication December 19, 2008. Cereal production that now sustains a world population of more than 6.5 billion has tripled during the past 40 yr, concurrent with an increase from 12 to 104 Tg yr–1 of synthetic N applied largely in ammoniacal fertilizers. These fertilizers have been managed as a cost-effective form of insurance against low yields, without regard to the inherent effect ...
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PRZM-3, A Model for Predicting Pesticide and Nitrogen Fate in the Crop Root and Unsaturated Soil Zones: Users Manual for Release 3.12.2
This publication contains documentation for the PRZM-3 model. PRZM-3 is the most recent version of a modeling system that links two subordinate models – PRZM and VADOFT – in order to predict pesticide transport and transformation down through the crop root and unsaturated soil zones. Enhancements to Release 3.0 reported herein include algorithms that also enable modeling of the nitrogen cycle ...
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Enhancing phosphorus phytoremedation potential of two warm-season perennial grasses with nitrogen fertilization
Phytoremediation or use of plants to extract soil nutrients is a practice used to ameliorate the impacts of excessive soil nutrients. Pensacola bahiagrass (Paspalum notatum Flügge) and ‘Floralta’ limpograss [Hemarthria altissima (Poir.) Stapf & Hubb] were grown in a P-impacted Immokalee fine sand (Mehlich-1 P 30 mg P kg–1) to evaluate increasing N levels on dry matter yield (DMY), forage P ...
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Estimating forest soil Carbon and Nitrogen stocks with double sampling for stratification
Precise and accurate estimation of C and N in forest soils is important for monitoring long-term site productivity and C stock changes. Obtaining such estimates remains a major challenge, however, especially because of high natural variability in the forest floor. Although most researchers have used simple random sampling (SRS) for within-plot soil sampling, double sampling for stratification ...
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A dynamic analysis of nonpoint pollution control instruments in agriculture
Nonpoint pollution from agriculture is an emerging issue in the environmental policy of the European Union. Dynamic optimisation techniques are important in nonpoint pollution, and neglect of dynamic aspects may seriously mislead the proper design of policy measures. This paper presents an empirical assessment of nitrogen pollution abatement in the Ebro basin of northeastern Spain. The aim is to ...
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Nitrogen fixation of Sulla under Mediterranean conditions
Sulla coronaria (L.) B.H. Choi & H. Ohashi (=Hedysarum coronarium L.) is a Mediterranean forage legume grown extensively in rainfed Italian environments. Here we report the field quantification of its seasonal and annual N fixation, using the 15N isotopic dilution (ID) method, the influence of various nonfixing reference species on these estimates, and the allocation of fixed N between the ...
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3,4-Dimethylpyrazole Phosphate Solution
Nitrification inhibitor refers to a class of chemical substances that inhibit the biotransformation of ammonium nitrogen into nitrate nitrogen (NCT). Nitrification inhibitors reduce the formation and accumulation of nitrate in soil so that it can reduce the loss of nitrogenous fertilizer in the form of nitrate nitrogen and the impacting on ecological environment. Some results show that, although ...
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N-(N-butyl) Thiophosphoric Triamide Solution
N-Butylthiophosphoric triamide (NBPT, hereinafter referred to as "NBPT") is currently one of the most effective soil urease inhibitors. Agricultural fertilizers, mainly nitrogen fertilizers, are quickly decomposed by urease in the soil under normal use. This not only wastes a lot of nitrogen fertilizer resources, but also increases the cost of crop production, and brings a series of problems such ...
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N-(N-butyl)thiophosphoric triamide/NBPT
Urease inhibitor is a kind of substance that can inhibit the activity of soil urease, and it is a new technology which has been studied in urea or nitrogen compound fertilizer. Using soil urease inhibitor can effectively slow decomposition of urea into ammonia process, reduce soil NH4 + and NH3 concentration, soil fertility and crop fertilizer synchronization. NBPT is the most effective inhibitor ...
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