Spatial variation of nitrogen mineralization as a guide for variable application of nitrogen fertilizer to cereal crops

Córdova, Carolin; Barrera, Juan A.; Magna, Carlos

doi:10.1007/s10705-017-9886-2

Cited by 12 publications

(10 citation statements)

References 18 publications

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“…Because of the high variation in potentially mineralizable N over very short distances (< 1 m), the differences in the measurements from April to October were due not only to temporal but also to spatial variation. A significant amount of fine scale variation of net N mineralization at 1.5 m (in autumn) and 4.5 m (in spring) was found in the study by Córdova et al [38]. However, this variation was consistent in time, making sampling for N mineralization possible in either season (autumn or spring), directing spatial sampling strategies for available N and/or for monitoring purposes.…”

Section: Small-scale Variability Of Soil N Min As Affected By Tillage Intensitymentioning

confidence: 90%

“…Therefore, the movement of agrichemicals, including nitrate, through the soil profile and processes such as N mineralization and N immobilization may lead to diverse spatial distributions of soil mineral N (N min ) in different tillage systems [37]. This, in turn, may have an impact on the variability of crop yield and NUE [38]. In this study, the sampling of soil and plants from small adjacent field plots was used to assess and compare the spatial variability of NUE of winter wheat in two extreme tillage systems: CT, with moldboard plowing to a depth of 0.25 m and NT.…”

Section: Introductionmentioning

confidence: 99%

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Small-Scale Variation in Nitrogen Use Efficiency Parameters in Winter Wheat as Affected by N Fertilization and Tillage Intensity

Lüder¹,

Qin

Richner

et al. 2020

Sustainability

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Limited information exists on how tillage and nitrogen (N) fertilization affects small-scale variation in nitrogen use efficiency (NUE) and crop performance. In a two-year field study under temperate conditions, we investigated how tillage (NT, no-tillage; CT, conventional tillage) and N fertilization affected the small-scale variation in NUE and winter wheat performance (grain yield, Gw; grain protein concentration, GPC). A randomized complete block design with three replications was used. Within each tillage plot (12 × 35 m2), N rates (0, 50, 100, 150, 200, 250 kg N ha−1) were completely randomized within each of four groups of microplots (1.5 × 1.5 m2). Early-season soil mineral N (Nmin) was also monitored in both years. At rates < 150 kg N ha−1, NT was not competitive with CT in terms of Gw and NUE. Gw and aboveground plant N were not correlated with Nmin prior to application of N fertilizer. NT usually led to larger spatial heterogeneity of Nmin, Gw, and NUE. The small-scale variability of Gw, GPC, NUE, and N supply decreased with increasing N fertilization rates under both tillage systems. Significant increases in Gw and GPC were observed with increasing N rates, whereas NUE decreased slightly with increasing N rates in both NT and CT. The overall moderate spatial variation in Nmin, Gw, and NUE did not justify site-specific N fertilization in these small fields, with the exception of the stony within-plot positions, which were not responsive to rates of N > 50 kg N ha−1.

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Section: Small-scale Variability Of Soil N Min As Affected By Tillage Intensitymentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Small-Scale Variation in Nitrogen Use Efficiency Parameters in Winter Wheat as Affected by N Fertilization and Tillage Intensity

Lüder¹,

Qin

Richner

et al. 2020

Sustainability

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“…Other important point to consider is the NNM spatial variability even within the same soil type and crop management unit. For instance, Córdova et al (2018) found that the withinfield spatial variation in NNM was almost all (92-93%) encompassed by the scales of variation measured (ranging from 2 to 122 m), all occurring within around 40 m in both autumn and spring seasons. In our study, in Zm-cc during early autumn, the incorporation of maize residues with wide C-to-N ratio on soils is known to cause N immobilisation; similar results were reported by Partey et al (2014); while in F-F, the results suggest that there is a lower availability of labile C and rates of microbial activity that generate N immobilisation than that in soils collected from under plants such as Zmcc as it was also noted by Barrett and Burke (2000).…”

Section: Discussionmentioning

confidence: 99%

Net Nitrogen Mineralisation in Maize-Cover Crop Rotations in Mediterranean Central Chile

Salazar

Casanova

Nájera

et al. 2020

J Soil Sci Plant Nutr

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The main aim of this study was to evaluate the effects of the maize-cover crop rotation (Zm-cc) in the soil net nitrogen mineralisation (NNM) by measuring in situ NNM incubation in the upper soil (0-25 cm) during spring-summer (October-March) and autumn-winter (April-September) seasons and compared with other rotation in Mediterranean Central Chile. The study was carried out at 5 experimental fields (only irrigated in spring-summer period), where four common soil use or maizebased rotations were evaluated: permanent fallow (F-F); maize-fallow (Zm-F); maize-cover crop (Zm-cc); and permanent cover crops (cc-cc). In these fields were carried out NNM in situ determinations in F-F (n = 18), Zm-F (n = 31), Zm-cc (n = 43), and cccc (n = 51) combinations (totalise n = 143), which were collected during spring-summer and autumn-winter in different periods between 2011 and 2018. During the spring-summer period, it was found that the NNM was highest in the Zm-cc rotations with a mean value of 36 kg N ha −1 , whereas the lowest NNM values were in F-F soil use with and mean of 6 kg N ha −1. In contrast, during autumn-winter season, the NNM was highest in the F-F soil use with a mean of 34 kg N ha −1 , while the lowest NNM values were found in Zm-cc rotation with a mean of − 38 kg N ha −1. During the spring-summer period, the Zm-cc rotation had the highest NNM values because cc increased the soil organic matter (SOM) content for microbial activity, whereas in autumnwinter, the Zm-cc rotation had the lowest NNM values because the cc added fresh SOM that increased N immobilisation process.

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“…Al observar la gráfica, ambos sitios obtuvieron un efecto pepita menor al 25% de la varianza total, con la particularidad de encontrar efecto nulo en el sitio Andisol. Esto también ha sido observado para el suelo Andisol usando otro indicador de la mineralización (Córdova et al, 2018), e implica que en este estudio el error experimental de la cuantificación del PND fue bajo, y no interfiere en la cuantificación de la medición de la dependencia espacial.…”

Section: Comparación De La Dependencia Espacial Entre Sitiosunclassified

Dependencia Espacial Del Potencial De Nitrógeno Disponible Del Suelo en Dos Sitios Contrastantes

Córdova

Magna

Barrera

et al. 2020

Chil. j. agric. anim. sci.

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RESUMENLa alta variabilidad del nitrógeno (N) en el suelo afecta la aplicación efectiva de fertilizantes nitrogenados. El objetivo de esta investigación fue determinar y evaluar la dependencia espacial del N en dos tipos de suelo. Para ello se utilizó un diseño espacial anidado optimizado, con 16 estaciones de muestreo, y en direcciones aleatorias se tomaron muestras de suelo (0-23 cm) a intervalos de distancia de 1,5; 4,5; 13,5; 40,5; y 121,5 m. Los suelos evaluados fueron un Andisol y un Inceptisol (2 x n = 98), en los que se midió el potencial de nitrógeno disponible (PND) a través de incubación anaeróbica de suelo por 7 días a 40 o C (PND = NH 4 + día 7 -NH 4 + día 1). La dependencia espacial del PND en cada uno de los sitios fue establecida mediante la acumulación de varianza de cada distancia, calculada a través de un análisis de máxima probabilidad residual (REML), y posterior aproximación al variograma. Los resultados mostraron un rango amplio de valores en ambos sitios. El sitio Andisol registró un elevado PND, con un valor promedio de 32,92 mg NH 4 + kg -1 , cinco veces mayor que en el Inceptisol, lo que se explicó principalmente por un mayor contenido de materia orgánica. La dependencia espacial del PND para ambos sitios se obtuvo a intervalos de 13,5 y 40,5 m, logrando cuantificar un 59% de la variabilidad del proceso en el sitio Andisol, y tan sólo un 35% en el sitio Inceptisol.Palabras clave: suministro de nitrógeno del suelo, Andisol, Inceptisol, variograma, muestreo anidado. ABSTRACTSoil nitrogen (N) variability affects the effective application of N fertilizers. The objective of this research was to determine and assess the spatial dependence of soil N in two different soils using spatial sampling and geostatistics fundamentals. An optimized nested sampling design was applied in two sites, using 16 main stations from where soil samples (0 -23 cm) were obtained at 1.5, 4.5, 13.5, 40.5, and 121.5 m, at random directions. Soil samples were collected from an Andisol and an Inceptisol (2 x n = 98), and the potentially available N (PAN) was measured by anaerobic soil incubation for 7 days at 40 o C (PAN = NH 4 + day 7 -NH 4 + day 1). The PAN variance components from each distance were calculated by residual maximum likelihood (REML), and then accumulated to plot an approach to the variogram. The results showed a wide range of values for PAN at both sites. The Andisol site registered high PAN levels, with a mean value of 32.92 mg NH 4 + kg soil -1 , which was five times larger than in the Inceptisol soil, probably associated with a larger soil organic matter content. The limit of the spatial dependence was 13.5 m for the Andisol, and 40.5 m for the Inceptisol soil, corresponding to the 59% and 35% of the process variance, respectively.

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Spatial variation of nitrogen mineralization as a guide for variable application of nitrogen fertilizer to cereal crops

Cited by 12 publications

References 18 publications

Small-Scale Variation in Nitrogen Use Efficiency Parameters in Winter Wheat as Affected by N Fertilization and Tillage Intensity

Small-Scale Variation in Nitrogen Use Efficiency Parameters in Winter Wheat as Affected by N Fertilization and Tillage Intensity

Net Nitrogen Mineralisation in Maize-Cover Crop Rotations in Mediterranean Central Chile

Dependencia Espacial Del Potencial De Nitrógeno Disponible Del Suelo en Dos Sitios Contrastantes

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