Topographically Controlled Yield Response of Canola to Nitrogen Fertilizer

Pennock, D.J.; Walley, F.L.; Solohub, M.; Si, Bingcheng; Hnatowich, G.

doi:10.2136/sssaj2001.1838

Cited by 25 publications

(18 citation statements)

References 29 publications

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“…Several studies have reported the influence of the landscape on the variability of soil physical attributes and its relationship with plant growth (Pennock et al, 2001;Rezaei & Gilkes, 2005;Terra et al, 2006). The relief is an independent and major soil formation factor (Jenny, 1941) that determines the soil distribution in the landscape (Bockheim et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

“…The potential of soil degradation by a management varies according to the location of the landscape and the spatial distribution of landscape attributes (Cambardella et al, 2004;Pennock, 2003). Soares et al (2005) affirmed that, to understand the temporal variation in the soil physical attributes, it is necessary to consider vertical and lateral variations (along the toposequence).…”

Section: Introductionmentioning

confidence: 99%

“…The same authors reported on the model established by Troeh (1965), which is based on relief profiles and hillslope curvatures in which the pedoforms vary from linear over convex to concave. Nizeyimana & Bicki (1992), Pennock et al (2001), De Alba et al (2004, Montanari et al (2005), Van Oost et al (2005), and Brito et al (2006) studied the relationships between the spatial variability in soil attributes and terrain curvature.…”

Section: Introductionmentioning

confidence: 99%

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Spatial variability of physical attributes of an alfisol under different hillslope curvatures

Camargo¹,

Júnior

Pereira

2010

Rev. Bras. Ciênc. Solo

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SUMMARYThe influence of relief forms has been studied by several authors and explains the variability in the soil attributes of a landscape. Soil physical attributes depend on relief forms, and their assessment is important in mechanized agricultural systems, such as of sugarcane. This study aimed to characterize the spatial variability in the physical soil attributes and their relationship to the hillslope curvatures in an Alfisol developed from sandstone and growing sugarcane. Grids of 100 x 100 m were delimited in a convex and a concave area. The grids had a regular spacing of 10 x 10 m, and the crossing points of this spacing determined a total of 121 georeferenced sampling points. Samples were collected to determine the physical attributes related to soil aggregates, porosity, bulk density, resistance to penetration and moisture within the 0-0.2 and 0.2-0.4 m depth. Statistical analyses, geostatistics and Student's t-tests were performed with the means of the areas. All attributes, except aggregates > 2 mm in the 0-0.2 m depth and macroporosity at both depths, showed significant differences between the hillslope curvatures. The convex area showed the highest values of the mean weighted diameter, mean geometric diameter, aggregates > 2 mm, 1-2 mm aggregates, total porosity and moisture and lower values of bulk density and resistance to penetration in both depth compared to the concave area. The number of soil attributes with greater spatial variability was higher in the concave area.Index terms: soil-landscape relationship, geostatistics, semivariogram. RESUMO: VARIABILIDADE ESPACIAL DE ATRIBUTOS FÍSICOS DE UM ARGISSOLO SOB DIFERENTES CURVATURAS DO RELEVO

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spatial variability of physical attributes of an alfisol under different hillslope curvatures

Camargo¹,

Júnior

Pereira

2010

Rev. Bras. Ciênc. Solo

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“…Studies conducted at different locations throughout Saskatchewan assessing the potential for VRF have examined the responsiveness of soils to N fertilizer additions in topographically defined landscape positions (Beckie et al 1997;Pennock 2000;Pennock et al 2001;). The results of these studies indicated a general lack of consistent agronomic and economic advantages to VRF, as well as an inadequacy of spring nitrate-nitrogen (NO 3 -N) in predicting crop yield response in variable landscapes.…”

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confidence: 99%

Relationship of the Illinois soil nitrogen test to spring wheat yield and response to fertilizer nitrogen

Steckler¹,

Pennock²,

Walley³

2008

Can. J. Soil. Sci.

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. 2008. Relationship of the Illinois soil nitrogen test to spring wheat yield and response to fertilizer nitrogen. Can. J. Soil Sci. 88: 837Á848. The Illinois soil N test (ISNT) has been used to distinguish between soils that are responsive and non-responsive to fertilizer N in Illinois. We examined the suitability of this test, together with more traditional measures of soil fertility, including spring nitrate-N and soil organic carbon (SOC), for predicting yield and N fertilizer response of wheat (Triticum aestivum) on hummocky landscapes in Saskatchewan. The relationship between ISNT-N and wheat yield and fertilizer N response was assessed using data and soils previously collected for a variable-rate fertilizer study. Soils were re-analyzed for ISNT-N. Our goal was to determine if ISNT-N could be used to improve the prediction of crop yields. Although ISNT-N was correlated with both unfertilized wheat yield (r 00.467, P 00.01) and fertilizer N response (r 0(0.671, P00.01) when data from all study sites were combined, correlations varied according to landscape position and site. Stronger correlations between nitrate-N and both unfertilized wheat yield (r00.721, P 00.01) and fertilizer N response (r 0(0.690, P00.01) indicated that ISNT-N offered no advantage over nitrate-N. Although both tests broadly discriminated between sites with high or low N fertility, few relationships were detected on a point-by-point basis within a field. Stepwise regression equations predicting yield and yield response did not include ISNT-N, due in part to the high degree of collinearity between ISNT-N and other variables such as SOC, suggesting that ISNT-N alone was not a key indicator of soil N supply. Le test du N du sol de l'Illinois (ISNT) sert a`diffe´rencier les sols de l'Illinois qui re´agissent bien ou mal aux engrais azote´s. Les auteurs voulaient e´tablir si ce test et les me´thodes plus classiques servant a`ve´rifier la fertilite´du sol, notamment la concentration de N-nitrate au printemps et la teneur en carbone organique du sol (COS), pouvaient servir a`pre´voir le rendement et la re´action aux engrais N du ble´(Triticum aestivum) cultive´sur les terrains mamelonne´s de la Saskatchewan. Pour cela, ils ont e´value´les liens entre le N-ISNT et le rendement du ble´ainsi que la re´action de cette culture aux engrais azote´s graˆce aux donne´es et aux e´chantillons de sol recueillis dans le cadre d'une e´tude sur la variation du taux d'application des engrais. Ils ont analyseć es sols pour e´tablir leur concentration de N-ISNT. L'objectif ultime e´tait de de´terminer si le N-ISNT pourrait conduire ad e meilleures pre´visions du rendement des cultures. Bien que le N-ISNT soit corre´le´au rendement des cultures de ble´non bonifie´es (r00,467, P00,01) et a`la re´action aux engrais N (r 0(0,671, P00,01) quand on combine les donne´es de tous les sites e´tudie´s, ces corre´lations varient avec l'emplacement dans le paysage et avec le site. La plus e´troite corre´lation existant entre le N-nitrate et le rendement du ble´non bonifie...

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“…There is extensive literature from the northern Great Plains regarding the use of topographical information in the delineation of management zones (Pennock et al 2001;Beckie et al 1997), but the relationship between dynamic soil properties and zones defined using topography has not proven to be constant through time because of weather (Pennock et al 2001, Zebarth andde Jong 1989;Androsoff et al 1995).…”

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confidence: 99%

Effectiveness of using vegetation index to delineate zones of different soil and crop grain production characteristics

Basnyat¹,

McConkey²,

Selles³

et al. 2005

Can. J. Soil. Sci.

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Effectiveness of using vegetation index to delineate zones of different soil and crop grain production characteristics. Can. J. Soil Sci. 85: 319-328. Cost-effective methods to map differences in productivity across fields have potential application for site-specific management of fertilizer and pesticides. In this study, zones were delineated for a field with hummocky topography in southwestern Saskatchewan by clustering the normalized difference vegetation index (NDVI) derived from Landsat TM information. Zones uniqueness were confirmed if zones differed in grain yield. Two different zones were delineated in the field. These zones had significant (P < 0.05) differences in soil factors related to productivity: average solum depth, spring soil nitrogen (N), phosphorus (P), and spring soil moisture. Over 4 yr, the two zones also had different spring wheat (Triticum aestivum L.) grain yield and protein content. The yield response to N-P fertilizer blend within each zone was different with no significant response to N-P fertilizer in the zone with higher NDVI values versus a significant response to N-P in the zone with lower NDVI. The results indicate a potential economic advantage to reducing fertilizer application to the zone without fertilizer response. Further, the residual soil NO 3 -N in the zone without fertilizer response was positively correlated with N application in the previous year. Therefore, there is a potential environmental benefit to reducing fertilizer application to that zone to decrease residual NO 3 -N, which can leach and contaminate ground water or can be denitrified to the greenhouse gas, N 2 O. Hence, this relatively simple and low-cost method of zone delineation has potential practical application to realize economic and environmental benefits from site-specific management of fertilizer. Un rendement grainier différent a servi à confirmer le caractère unique de ces zones. Deux zones distinctes ont été définies sur le terrain. Ces zones se distinguaient par une variation significative (P < 0,05) des facteurs pédologiques associés à la productivité : l'épaisseur moyenne des horizons, la concentration d'azote (N) dans le sol au printemps, celle de phosphore (P) et la teneur en eau à la même époque. En quatre ans, les deux zones ont aussi donné un rendement grainier et une teneur en protéines différents pour le blé de printemps (Triticum aestivum L.). La réaction du rendement au mélange d'engrais N et P différait dans chaque zone, sans réaction significative dans celle à l'indice de végétation le plus élevé et avec une réaction significative dans celle où l'indice était plus faible. Les résultats indiquent qu'une diminution de la quantité d'engrais appliquée dans la zone ne réagissant pas aux amendements pourrait présenter un certain potentiel économique. Par ailleurs, la quantité de N-NO 3 résiduelle dans la zone ne réagissant pas aux amendements est positivement corrélée à l'application de N l'année antérieure. Une réduction des applications d'engrais dans cette zone pourrait donc avoir des...

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Topographically Controlled Yield Response of Canola to Nitrogen Fertilizer

Cited by 25 publications

References 29 publications

Spatial variability of physical attributes of an alfisol under different hillslope curvatures

Spatial variability of physical attributes of an alfisol under different hillslope curvatures

Relationship of the Illinois soil nitrogen test to spring wheat yield and response to fertilizer nitrogen

Effectiveness of using vegetation index to delineate zones of different soil and crop grain production characteristics

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