Comparative effects of partial root-zone drying and deficit irrigation on nitrogen uptake in potatoes (Solanum tuberosum L.)

Huiqun, Wang; Liu, Fulai; Andersen, Mathias Neumann; Jensen, Christian R.

doi:10.1007/s00271-009-0159-y

Cited by 72 publications

(38 citation statements)

References 23 publications

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“…In addition, earlier studies indicated that at similar soil water deficits, PRI can intensify ABA signalling relative to the DI treatment resulting in better control of plant water loss causing further improvement of WUE (Dodd 2007;Wang et al 2010). Most recently, our studies have also shown that, compared to DI, PRI could improve crop N nutrition and optimize N distribution in the canopy and both might have contributed to the improved WUE (Wang et al 2009(Wang et al , 2010. Thus, as a field management practice, PRI has the potential to improve WUE and nitrogen use efficiency (NUE) simultaneously.…”

Section: Introductionmentioning

confidence: 84%

Alternate partial root-zone irrigation induced dry/wet cycles of soils stimulate N mineralization and improve N nutrition in tomatoes

et al. 2010

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Given the same amount of irrigation volume, applying alternate partial root-zone irrigation (PRI) has improved crop N nutrition as compared to deficit irrigation (DI), yet the mechanisms underlying this effect remain unknown. Therefore, the objective of this study was to investigate whether PRI induced soil dry/wet cycles facilitate soil organic N mineralization hereby contributing to the improvement of N nutrition in tomatoes. The plants were grown in splitroot pots in a climate-controlled glasshouse and were subjected to PRI and DI treatments during early fruiting stage. 15 N-labeled maize residues were incorporated into the soils. Results showed that PRI resulted in 25% higher net 15 N mineralization than did DI, indicating that the enhanced mineralization of soil organic N alone could account for the 16% increase of N accumulation in the PRI than in the DI plants. The higher net N mineralization under PRI was coincided with an intensified soil microbial activity. In addition, even though soil chloroform fumigation labile carbon (CFL-C, as an index of microbial biomass) was similar for the two irrigation treatments, a significant increase of chloroform fumigation labile nitrogen (CFL-N) was found in the PRI wetting soil. Consequently, the C:N ratio of the chloroform fumigation labile pool was remarkably modified by the PRI treatment, which might indicate physiological changes of soil microbes or changes in labiality of soil organic C and N due to the dry/wet cycles of soils, altering conditions for net N mineralization. Moreover, in both soil compartments PRI caused significantly less extractable organic carbon (EOC) as compared with DI; whilst in the PRI wetting soil significantly higher extractable organic nitrogen (EON) was observed. A low EOC:EON ratio in the PRI wetting soil may indicate an increasing net mineralization of the organic N as a result of microbial metabolism. Conclusively, PRI induced greater microbial activity and higher microbial substrates availability are seemingly responsible for the enhanced net N mineralization and improved N nutrition in tomato plants.

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Section: Introductionmentioning

confidence: 84%

Alternate partial root-zone irrigation induced dry/wet cycles of soils stimulate N mineralization and improve N nutrition in tomatoes

et al. 2010

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“…Water or salinity stresses may reduce crop N uptake (Karandish and Šimůnek, 2017;Ramos et al, 2012) and lead to higher nutrient loads into aquifers as a byproduct of N leaching out of the root zone (Zhu et al, 2005;Thompson et al, 2007;Dudley et al, 2008;Burow et al, 2010;Dahan et al, 2014;. If fresh water is applied, N leaching may be lower under PRD than under DI due to a higher crop N recovery (Kang and Zhang, 2004;Kirda et al, 2005;Li et al, 2007;Wang et al, 2009;Hu et al, 2009;Wang et al, 2012;Karandish and Šimůnek, 2017), which could translate into lower groundwater contamination. Even so, no earlier studies have ever attempted to find the optimal combination of N fertilization rates and applied water levels under PRD irrigated with saline water.…”

Section: Introductionmentioning

confidence: 99%

An application of the water footprint assessment to optimize production of crops irrigated with saline water: A scenario assessment with HYDRUS

Karandish

Šimůnek

2018

Agricultural Water Management

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Agriculture, due to a growing scarcity of fresh water resources, often uses low-quality waters for irrigation, such as saline waters. However, unmanaged applications of such waters may have negative environmental and economic consequences. Based on the concept of the water footprint (WF), a measure of the consumptive and degradative water use, the field-calibrated and validated HYDRUS (2D/3D) model was applied to find optimal management scenarios (from 1980 different evaluated scenarios). These scenarios were defined as a combination of different salinity rates (SR), irrigation levels (IL, the ratio of an actual irrigation water deth and a full irrigation water depth), nitrogen fertilization rates (NR), and two water-saving irrigation strategies, deficit irrigation (DI) and partial root-zone drying (PRD). The consumptive WF was defined as the crop water consumption divided by the crop yield. The grey WF was calculated for the N fertilizer and defined as the volume of freshwater required to dilute nitrogen (N) in recharge so as to meet ambient water quality standards. Simulated components of water and solute dynamics were used to calculate criteria indices, which were divided into two groups: (a) environmental indices, including the degradative grey water footprint (GWF) and the apparent N recovery rate efficiency (ARE), and (b) economic indices, including economic water (EWP) and land (ELP) productivities. While significant improvements of 3.9-59.2%, 0.1-165.8%, and 0.01-166.5% in ARE, EWP, and ELP, respectively, were obtained when NR varied within the range of 0-200 kg ha −1 , changes in these indices were relatively minor when NR was higher than 200 kg ha −1. At a given NR, GWF tends to increase considerably by up to 180% when DI-crops are subject to low-intermediate salt (SR < 7 dS m −1) and water (IL > 70%) stresses. This is at the expense of up to a 55% reduction in ELP and up to a 120% increase in EWP. With N uptake 0.2-17.3% higher, PRD seems to be a more viable agro-hydrological option than DI in reducing a pollutant load into regional aquifers as well as in sustaining farm economics. The entire analysis reveals that the PRD strategy with N-fertilization rates of 100-200 kg ha ), and irrigation levels of 60-90% represents the best management scenario. It can be concluded that, while there is a substantial need for rescheduling irrigation and fertilization managements when crops are irrigated with saline waters, HYDRUS modeling may be a reliable alternative to extensive field investigations when determining the optimal agricultural management practices.

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“…The irrigated and dry sides are periodically switched (Karandish andŠimůnek, 2016a). A numerous studies have been carried out on the possible effects of this irrigation strategy on quantitative and qualitative properties of different crops, most of which agreed that there is a significant increase in the water use efficiency under PRD (Kang and Zhang, 2004;Kirda et al, 2005;Li et al, 2007;Wang et al, 2009;Hu et al, 2009;Wang et al, 2012;Karandish andŠimůnek, 2016a). The results of these studies demonstrated that PRD can greatly induce the initiation and growth of secondary roots, which improve both water and nutrient uptake.…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional modeling of nitrogen and water dynamics for various N-managed water-saving irrigation strategies using HYDRUS

Karandish

Šimůnek

2017

Agricultural Water Management

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a b s t r a c tNitrate losses are the dominant cause of the non-point source pollution under agricultural fields. In this study, the HYDRUS-2D model was first calibrated and validated using data collected during a two-year field investigation in a drip-irrigated maize field and then applied to evaluate the influence of 176 different N-managed water-saving irrigation scenarios on water and N dynamics and maize grain yield. Various scenarios were defined by combining 11 irrigation levels (IL = 0-100% with a 10% interval), 8 N fertilization rates (NR = 0-400 kg ha −1 with a 50 kg ha −1 interval) and two water-saving irrigation strategies: deficit irrigation (DI) and partial root-zone drying (PRD). Reliable estimates of soil NO 3 − -N concentrations (RMSE = 0.39-10.9 mg l −1 and MBE = −8.9-8.4 mg l −1 ), crop N uptake (RMSE = 3.9-8.9 kg ha −1 and MBE = −5.3-6.25 kg ha −1 ), and soil water contents (RMSE = 2.3-5.11 mm and MBE = 1.63-4.93 mm) were provided by HYDRUS-2D. Based on the simulated results, the fertigation strategy with NR = 200 kg ha −1 is an optimum strategy. For the higher fertigation rates (NR ≥ 250 kg ha −1 ), the NO 3 − -N leaching out of the surface layers (0-20 cm) increased by 0.1-183% while N uptake was enhanced by only 0.3-15%. On the other hand, reducing NR below this level would have resulted in severe economic losses. A 30% reduction in IL at NR = 200 kg ha −1 shows an enormous potential in lowering N leaching below different soil layers (12-99%) while reducing crop N uptake by only 5.4%. In addition, higher crop yield by 0.2-20.2% can be expected under PRD since crop N uptake is enhanced by more water available in the surface layers. While on the one hand, PRD ensures environmentally safer fertilizer applications, on the other hand, the economic objectives are met more easily under PRD than under DI. Additionally, it could be concluded that the HYDRUS-2D model, instead of labor-and time-consuming and expensive field investigations, could be reliably used for determining the optimal scenarios under both the DI and PRD strategies.

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Comparative effects of partial root-zone drying and deficit irrigation on nitrogen uptake in potatoes (Solanum tuberosum L.)

Cited by 72 publications

References 23 publications

Alternate partial root-zone irrigation induced dry/wet cycles of soils stimulate N mineralization and improve N nutrition in tomatoes

Alternate partial root-zone irrigation induced dry/wet cycles of soils stimulate N mineralization and improve N nutrition in tomatoes

An application of the water footprint assessment to optimize production of crops irrigated with saline water: A scenario assessment with HYDRUS

Two-dimensional modeling of nitrogen and water dynamics for various N-managed water-saving irrigation strategies using HYDRUS

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