Soil mineral nitrogen dynamics in fallow periods in a rainfed semiarid Mediterranean agricultural system

Shakoor, Awais; Bosch‐Serra, Ángela D.; Lidón, Antonio; Ginestar, D.; Boixadera, Jaime

doi:10.1016/j.pedsph.2022.06.051

Cited by 6 publications

(3 citation statements)

References 57 publications

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“…Since these parameters indicated a good prediction of the θ v , the water drainage estimated by LEACH-W was considered reliable. The estimation of drainage using the LEACHM model has been reported by other authors(Aparicio et al, 2008;Jiang et al, 2022;Shakoor et al, 2022)…”

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confidence: 76%

“…The deterministic model LEACHM (Leaching Estimation and Chemistry Model) was developed by Wagenet and Hutson (1989) to predict water ow and solute transport, plant absorption and distribution of the solute throughout the soil pro le. Despite being a model of more than 30 years, its current use continues to be reported in the literature, either to estimate water drainage (Aparicio et al, 2008;Jiang et al, 2022) or simulate the leaching of reactive solutes in the soil (Shakoor et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

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Nitrate leaching in Argiudoll soil under maize with different doses of fertilizer

Zamora¹,

Aparicio²,

Cerdà

et al. 2022

Preprint

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Nitrogen induced an increase in agriculture production and contributed to the growth of the world population. However, the overuse of nitrogen resulted in the pollution of water resources. The expansion of agriculture in Argentina is a good example of the abuse of nitrogen fertilization, but little is known about the damage induced in water quality. The objectives of this study were to (i) Adjust and validate the LEACH-W model simulations with data observed in the field, (ii) quantify nitrate concentrations in the drainage water, (iii) quantify N leaching from a corn-cropped soil, (iv) calculate a simplified soil-plant N balance. Treatments consisted of 0, 100 and 200 kg N ha-1 applied at planting in a RCBD with 4 replications. Ceramic suction cups, and the LEACH-W model were used to measure and model nitrate leaching, respectively. Nitrate leaching was related to drainage events, and nitrate levels in drainage water surpassed 10 mg L-1 of NO3--N in the fertilized treatments. Nitrate leaching was enhanced by the presence of high residual soil nitrate levels. Losses from the fertilized treatments represented 27 and 17% of the applied N for the 100 and 200 kg N ha rates, respectively. Nitrogen fertilization of maize is a threat of contamination of groundwater in the SE region of Buenos Aires, despite the fact that the doses of nitrogen fertilizer are lower than those used in other parts of the world.

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confidence: 76%

Section: Introductionmentioning

confidence: 99%

Nitrate leaching in Argiudoll soil under maize with different doses of fertilizer

Zamora¹,

Aparicio²,

Cerdà

et al. 2022

Preprint

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“…While there is a common perception that commercial potato farmers over-apply nutrients, the observed N and K uptake efficiencies in the interior were often above 1, indicating that more N and K were taken up by the crop than supplied. Given that land is usually left fallow and undisturbed in dry climates for several years before potato is grown on it again, extensive soil cultivations prior to potato planting along with irrigation likely led to a burst of microbial activity, and the associated breakdown of organic carbon and mineralization of nutrients (Shakoor et al, 2022). This was less likely the case in the Sandveld, where sandy soils with very low carbon contents and nutrient holding capacity have a poor inherent ability to supply nutrients.…”

Section: Discussionmentioning

confidence: 99%

In-field assessment of the variability in water and nutrient use efficiency among potato farmers in a semi-arid climate

Franke,

Machakaire,

Mukiibi

et al. 2023

Front. Sustain. Food Syst.

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Precise water management is imperative for sustainable crop production under irrigation in semi-arid regions with increasingly variable rainfall. Water use efficiencies achieved by farmers often differ widely, even within regions with homogenous agro-ecological conditions. To better understand the drivers of this variability and derive management recommendations, detailed measurements of water and associated nutrient dynamics were conducted on 20 potato farms in two regions of South Africa. Crop characteristics and typical growing conditions in South Africa make potato cultivation sensitive to water and nutrient losses. Water and nutrient inputs and losses through drainage and plant uptake were measured in potato and the follow-up crop, along with yield and weather variables. Seasonal mean irrigation and evapotranspiration were lower in winter crops (240 mm irrigation, 236 mm evapotranspiration) than in summer crops (598 mm irrigation, 608 mm evapotranspiration). Seasonal field water balances were often close to zero, indicating that estimations of evapotranspiration and drainage were representative for the greater field. Lysimeter observations however appeared more representative in sandy unstructured soils than in heavier structured soils. Rainfall during cropping reduced demand for irrigation and increased water use efficiency based on irrigation water, but caused substantial drainage. Leaching of N and K was considerable (on average 30 kg N, 55 kg K ha−1, much higher in some fields), while P leaching was negligible, with the exception of one field (51 kg P ha−1). Variation in water and nutrients use efficiencies was the result of management decisions and environmental factors, such as rainfall and soil type. Without substantial rainfall, application of irrigation scheduling tools can keep drainage and nutrient losses to a minimum, as was observed on almost half the fields, even on sandy soils with a low water holding capacity. Potato yields greatly varied among farmers (9.1–24.7 t dry matter tuber ha−1). Efficient farmers included those who used water sparsely and had minimal drainage, but also farmers who used inputs judiciously and obtained excellent productivity. The role of follow-up crops as users of surplus nutrients and water left behind by the potato crop was not always evident.

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Decreased soil pH weakens the positive rhizosphere effect on denitrification capacity

WANG,

ZHANG,

LIANG

et al. 2024

Pedosphere

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Soil mineral nitrogen dynamics in fallow periods in a rainfed semiarid Mediterranean agricultural system

Cited by 6 publications

References 57 publications

Nitrate leaching in Argiudoll soil under maize with different doses of fertilizer

Nitrate leaching in Argiudoll soil under maize with different doses of fertilizer

In-field assessment of the variability in water and nutrient use efficiency among potato farmers in a semi-arid climate

Decreased soil pH weakens the positive rhizosphere effect on denitrification capacity

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