Denitrification Losses from Sandy and Sandy Loam Soils under Spring Barley Fertilized with Slurry and Ammonium Nitrate

Maag, M.

doi:10.1080/09064719509413109

Cited by 6 publications

(5 citation statements)

References 29 publications

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“…It was found that mineralization was 19 kg Nlhaly greater at 120 kg Nlha than at 60 kg Nlha. Furthermore, the annual denitrification on this soil has been found to be below 1 kg Nlha (Vinther, 1992;Maag, 1995).…”

Section: Nitrate Leachingmentioning

confidence: 82%

Nitrate leaching as affected by long‐term N fertilization on a coarse sand

Hansen

Djurhuus

1996

Soil Use and Management

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Abstract. A field experiment on a coarse sand (1987–92) was conducted with spring barley (Hordeum vulgare L.), in order to evaluate the effects of increasing N fertilization on nitrate leaching under temperate coastal climate conditions. The N fertilizer levels were 60 and 120 kg N/ha. The experiment was conducted on a 19‐year old permanent field trial with continuous spring barley, initiated in 1968, and included treatments with ploughing in autumn or spring, with or without perennial ryegrass (Lolium perenne L.) as a catch crop undersown in spring. Prior to 1987, the low and high levels of N fertilizer were 70 and 150 kg N/ha, respectively. To calculate nitrate leaching, soil water samples were taken from a depth of 0.8 m using ceramic cups. The average annual nitrate leaching from plots with 60 and 120 kg N/ha was 38 and 52 kg N/ha/y, respectively. The increased leaching associated with increasing fertilizer application was not caused by inorganic N in the soil at harvest, but rather by greater mineralization, mainly in autumn. Growing of a catch crop was relatively more efficient for reducing nitrate leaching than a long‐term low fertilizer application. A 50% reduction in N application decreased average yield by 26%, while nitrate leaching decreased by 27%.

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Section: Nitrate Leachingmentioning

confidence: 82%

Nitrate leaching as affected by long‐term N fertilization on a coarse sand

Hansen

Djurhuus

1996

Soil Use and Management

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“…The soil water content was on average 74% higher at Kise than at Apelsvoll, but h did not exceed 32 vol%, which equals water filled pore space well below 70%. Water filled pore space below 70-80% implies that denitrification would be low (Maag 1995). Moreover, the proportion of NO 3 -N in the topsoil was larger at Kise than at Apelsvoll, which also indicates that the reductive transformation of NO 3 -N was of little importance here.…”

Section: Measurements Of Ec a And Changes In Soil Inorganic Nmentioning

confidence: 88%

Soil Apparent Electrical Conductivity (ECa) as a Means of Monitoring Changesin Soil Inorganic N on Heterogeneous Morainic Soils in SE Norway During Two Growing Seasons

Korsæth

2005

Nutr Cycl Agroecosyst

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An efficient method to monitor changes in soil inorganic N content during crop growth would be a useful means to guide N fertilization to ensure high yields and low N losses to the environment. In this study, soil apparent electrical conductivity (EC a ) measured by the widely used conductivity meter EM38 was tested as an indirect measurement of available N in spring barley during two cropping seasons at two sites with morainic loam in SE Norway. The experiment was constructed to maximize soil variation. In spite of the 'noise' caused by the soil heterogeneity, concentrations of inorganic N (cN inorg ) or NO 3 -N were most strongly correlated with EC a in both years and at both locations (with one exception). The measurements of EC a reflected well the temporal variation in inorganic N content (N inorg ), and a ranking of the treatments based on EC a fitted very well with a ranking based on N inorg at the first three sampling times after fertilizing. The best subset of sensor variables (i.e. variables which can be measured 'on-the-go' by sensor techniques in the field) described 27-69% (average 47%) of the variation in topsoil cN inorg . When expanding the regression models to include pH as well, the degree of explanation increased significantly. In conclusion, the method of using EC a appears to be quite robust in terms of detecting relative differences in cN inorg , whereas a determination of absolute levels of cN inorg with the method is unreliable.

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“…Thus, around 164–183 kg N inorg /ha was not accounted for in the N balance for Stage I. This N is unlikely to have been lost by denitrification in this well‐aerated sandy soil (Maag, ). In addition, N inorg of 224 kg/ha was left in the 0–2.50 m soil layer after the second harvest (Stage II) with the potential to leach over the winter.…”

Section: Discussionmentioning

confidence: 99%

Deep root growth and nitrogen uptake by rocket (Diplotaxis tenuifolia L.) as affected by nitrogen fertilizer, plant density and leaf harvesting on a coarse sandy soil

Kristensen

Stavridou

2017

Soil Use and Management

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This study investigated management strategies to increase deep root growth and crop nitrogen (N) uptake by rocket grown as baby leaf in coarse sandy soil. Stage I (sowing to first harvest) measured the effects of two sowing densities and two N fertilizer rates on root growth and total N uptake. In Stage II (first to second harvest), effects of leaf harvesting and late season N fertilizer application on root growth, total N uptake and deep 15 N uptake were measured. At the end of Stage I, root depth was 0.68-0.90 m, and the large fertilizer application increased N uptake. Plant density increased root depth, N uptake and nitrogen use efficiency (NUE) early in this stage and biomass production at harvest. Leaf harvesting in Stage II affected root density but not root depth that reached 1.4 m. The ability for N uptake was greater from 0.6 m due to more roots and larger N inflow than from 1.1 m depth. Late season fertilizer increased N concentration and uptake but did not affect NUE and deep N uptake. During the growing season, 330-349 kg N inorg /ha was lost from 0 to 1.0 m depth most likely by leaching. Management practices that increased root growth and N uptake were found to increase NUE in rocket production early in the season. The production system used N inefficiently and smaller applications, plant density, leaf harvesting and other changes of management are required to reduce leaching.

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Denitrification Losses from Sandy and Sandy Loam Soils under Spring Barley Fertilized with Slurry and Ammonium Nitrate

Cited by 6 publications

References 29 publications

Nitrate leaching as affected by long‐term N fertilization on a coarse sand

Nitrate leaching as affected by long‐term N fertilization on a coarse sand

Soil Apparent Electrical Conductivity (ECa) as a Means of Monitoring Changesin Soil Inorganic N on Heterogeneous Morainic Soils in SE Norway During Two Growing Seasons

Deep root growth and nitrogen uptake by rocket (Diplotaxis tenuifolia L.) as affected by nitrogen fertilizer, plant density and leaf harvesting on a coarse sandy soil

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