Nitrogen management of vegetable crops

Tei, Francesco; Neve, Stefaan De; Haan, J.J. de; Kristensen, Hanne Lakkenborg

doi:10.1016/j.agwat.2020.106316

Cited by 79 publications

(61 citation statements)

References 141 publications

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“…Approximately 170,000 ha of greenhouses and plastic tunnels [1] are used for intensive production of vegetables in the Mediterranean Basin. These greenhouse production systems are commonly associated with N applications that appreciably exceed what is required to ensure high yields [2,3]. Additionally, irrigation is often excessive to crop water requirements [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Soil Monitoring Methods to Assess Immediately Available Soil N for Fertigated Sweet Pepper

et al. 2020

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Excessive N application occurs in greenhouse vegetable production. Monitoring methods of immediately available soil N are required. [NO3−] in soil solution, sampled with ceramic cup samplers, and [NO3−] in the 1:2 soil to water (v/v) extract were evaluated. Five increasing [N], from very N deficient (N1) to very N excessive (N5) were applied throughout three fertigated pepper crops by combined fertigation/drip irrigation. The crops were grown in soil in a greenhouse. Soil solution [NO3−] was measured every 1–2 weeks, and extract [NO3−] every 4 weeks. Generally, for treatments N1 and N2, both soil solution and extract [NO3−] were continually close to zero, and increased with applied [N] for treatments N3–5. The relationships of both methods to the nitrogen nutrition index (NNI), an indicator of crop N status, were assessed. Segmented linear analysis gave R2 values of 0.68–0.70 for combined data from entire crops, for both methods. NNI was strongly related to increasing [NO3−] up to 3.1 and 0.9 mmol L−1 in soil solution and extracts, respectively. Thereafter, NNI was constant at 1.04–1.05, with increasing [NO3−]. Suggested sufficiency ranges were derived. Soil solution [NO3−] is effective to monitor immediately available soil N for sweet pepper crops in SE Spain. The extract method is promising.

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Section: Introductionmentioning

confidence: 99%

Soil Monitoring Methods to Assess Immediately Available Soil N for Fertigated Sweet Pepper

et al. 2020

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“…The N fertilisers we applied in both experiments we assumed would soon be converted to nitrate by urease catalysis and nitrification. The high soil N availability in surface soils may have met the N requirement of most crops (Tei et al 2020) or be sensed by the root systems (Tabata et al 2014), so the crops may produce fewer roots for nutrient uptake. High concentrations of nitrate might act as a signal rather than a nutrient and thus Fig.…”

Section: Effect Of Soil N Availability On Root Growthmentioning

confidence: 99%

“…Autumn catch crops in temperate agroecosystems have been reported to efficiently deplete deep soil nitrogen (N) after the main crop has been harvested, thereby reducing the risk of nitrate leaching to groundwater (Sapkota et al 2012;Tei et al 2020). The ability to reduce nitrate leaching varies between species and proportions in cover crop mixtures (Farneselli et al 2018), and depends on genetic traits of root growth, degree of winter hardiness, and Nsink capacity.…”

Section: Introductionmentioning

confidence: 99%

Deep root uptake of leachable nitrogen in two soil types is reduced by high availability of soil nitrogen in fodder radish grown as catch crop

et al. 2021

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Aims Plant available soil nitrogen (N) may affect deep root growth and soil N depletion by catch crops. We investigated the influence of topsoil N availability on root growth and uptake by fodder radish. Methods We conducted field and greenhouse experiments of root growth and late autumn N uptake at medium and high soil N availabilities, and root N inflow at medium and deep soil depths (15N injection) in sandy loam and loamy sand, using the minirhizotron method in the field and rhizotrons in the greenhouse. Results High soil N availability resulted in lower root intensity in the field, but higher root intensity in the greenhouse experiment under both soil types. Radish had deeper roots and higher root intensity in sandy loam than in loamy sand. High soil N availability caused lower 15N uptake at both soil depths in the field and lower N inflow rates at both soil depths in field and greenhouse. At medium soil N availability in the field, N inflow was twice as high in the deep than in the medium depth. Conclusions Higher soil N availability affects root growth and decrease N inflow, thus lowering late autumn N uptake and hampering deep N exploitation by fodder radish. At medium soil N availability, the potential for N uptake in deep soil is higher probably due to younger roots than at a medium soil depth. The shallower and less dense root growth in loamy sand is probably due to its lower clay and higher P contents.

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“…Nitrogen is among the substances routinely employed in agriculture, causing more than one concerns. In particular, it is applied in massive amounts as fertilizers in farming systems [ 6 , 7 ], and for its chemical and physical properties can, through run-off, reach freshwaters [ 8 ]. High concentrations of nitrogen dispersed into the environment can lead to freshwaters’ eutrophication, with very adverse effects on aquatic ecosystems [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Phytodepuration of Nitrate Contaminated Water Using Four Different Tree Species

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Bartucca

Pannacci

et al. 2021

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Water pollution by excessive amounts of nitrate (NO3−) has become a global issue. Technologies to clean up nitrate-contaminated water bodies include phytoremediation. In this context, this research aimed to evaluate four tree species (Salix alba L., Populus alba L., Corylus avellana L. and Sambucus nigra L.) to remediate nitrate-contaminated waters (100 and 300 mg L−1). Some physiological parameters showed that S. alba L. and P. alba L. increased particularly photosynthetic activity, chlorophyll content, dry weight, and transpired water, following the treatments with the above NO3− concentrations. Furthermore, these species were more efficient than the others studied in the phytodepuration of water contaminated by the two NO3− levels. In particular, within 15 days of treatment, S. alba L. and P. alba L. removed nitrate quantities ranging from 39 to 78%. Differently, C. avellana L. and S. nigra L. did not show particular responses regarding the physiological traits studied. Nonetheless, these species removed up to 30% of nitrate from water. In conclusion, these data provide exciting indications on the chance of using S. alba L. and P. alba L. to populate buffer strips to avoid NO3− environmental dispersion in agricultural areas.

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Nitrogen management of vegetable crops

Cited by 79 publications

References 141 publications

Soil Monitoring Methods to Assess Immediately Available Soil N for Fertigated Sweet Pepper

Soil Monitoring Methods to Assess Immediately Available Soil N for Fertigated Sweet Pepper

Deep root uptake of leachable nitrogen in two soil types is reduced by high availability of soil nitrogen in fodder radish grown as catch crop

Phytodepuration of Nitrate Contaminated Water Using Four Different Tree Species

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