Spatial Variability of Soil Phosphorus Indices under Two Contrasting Grassland Fields in Eastern Canada

Memiaghe, Jeff D. Nze; Cambouris, Athyna N.; Ziadi, Noura; Karam, Antoine; Perron, Isabelle

doi:10.3390/agronomy11010024

Cited by 7 publications

(8 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In Eastern Canada, local P recommendations have been developed for uniform P a-gronomic applications [34], based mainly on both soil P availability [(P M3 ) and (P/Al) M3 ] index, regardless of field size, soil P variability or their crop productivity potential. Soil variability and associated potential yield differences in a given field are responsible for the development of large field-scale heterogeneity in the distribution pattern of soil nutrients including P [35,36]. P fertilization based on uniform recommendations may result in over-fertilization in large field areas and also create under-fertilized areas [37].…”

Section: Introductionmentioning

confidence: 99%

Tillage Management Impacts on Soil Phosphorus Variability under Maize–Soybean Rotation in Eastern Canada

et al. 2022

Self Cite

View full text Add to dashboard Cite

Conservation tillage, including no-tillage (NT), is being used increasingly with respect to conventional tillage (CT) to mitigate soil erosion, improve water conservation and prevent land degradation. However, NT increases soil phosphorus (P) stratification, causing P runoff and eutrophication. For sustainable P management, fertilization must be balanced between P sources and actual crop demand. To reduce P losses to the environment, it is important to better understand P spatial variability in NT fields. Little is known about tillage impacts on field-scale P spatial variabi-lity in precision agriculture. This study examines tillage impacts on spatial variability of soil-avai-lable P in a maize–soybean rotation, in two commercial fields, denoted CT (10.8 ha) and NT (9.5 ha), with the aim of improving P fertilizer recommendations in Eastern Canada. NPK fertilizers were applied to the soils (Humic Gleysols) following local recommendations. Soil samples were collected in fall 2014 in regular 35 m by 35 m grids, at 0–5 and 5–20 cm depths, providing 141 and 134 geore-ferenced points for CT and NT fields, respectively. Available P and other elements were analyzed by Mehlich-3 extraction (M3), and the P saturation index (P/Al)M3 was calculated. Variability of soil-available P in both fields ranged from moderate to very high (32% to 60%). A mean (P/Al)M3 of 3% was found in both layers under CT, compared to 8% in the 0–5 cm layer and 6% in the 5–20 cm layer under NT. Relationships between P indices and other elements differed between tillage practices. This study highlights the need to improve P fertilizer recommendations in Eastern Canada.

show abstract

Section: Introductionmentioning

confidence: 99%

Tillage Management Impacts on Soil Phosphorus Variability under Maize–Soybean Rotation in Eastern Canada

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…Consequently, producers are evaluating the potential of precision agriculture (PA) to increase revenues and protect the environment through the site-specific management of crop inputs [5][6][7]. The delineation of management zones (MZs) can make it possible to manage spatial variability within an agricultural field by subdividing it into zones with more homogenous soil properties, and are of particular interest for implementation of site-specific management of nutrients and water [8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Four Delineation Methods to Identify Potential Management Zones in a Commercial Potato Field in Eastern Canada

et al. 2021

Self Cite

View full text Add to dashboard Cite

Management zones (MZs) are delineated areas within an agricultural field with relatively homogenous soil properties, and therefore similar crop fertility requirements. Consequently, such MZs can often be used for site-specific management of crop production inputs. This study evaluated the effectiveness of four classification methods for delineating MZs in an 8-ha commercial potato field located in Prince Edward Island, Canada. The apparent electrical conductivity (ECa) at two depths from a commercial Veris sensor were used to delineate MZs using three classification methods without spatial constraints (i.e., fuzzy k-means, ISODATA and hierarchical) and one with spatial constraints (i.e., spatial segmentation method). Soil samples (0.0–0.15 m depth) from 104 sampling points was used to measure soil physical and chemical properties and their spatial variation in the field were used as reference data to evaluate four delineation methods. Significant Pearson correlations between ECa and soil properties were obtained (0.22 < r < 0.85). The variance reduction indicated that two to three MZs were optimal for representing the field’s spatial variability of soil properties. For two MZs, most soil physical and chemical properties differed significantly between MZs for all four delineation methods. For three MZs, there was greater discrimination among MZs for several soil properties for the spatial segmentation-based method compared with other delineation methods. Moreover, consideration of the spatial coordinates of the data improved the delineation of MZs and thereby increased the number of significant differences among MZs for individual soil properties. Therefore, the spatial segmentation method had the greatest efficiency in delineation of MZs from statistical and agronomic perspectives.

show abstract

“…In addition, Phosphorus (P) has been identified as one of the most variability nutrients in soils in the coffee-growing region of Colombia (Lince and Sadeghian, 2016;Patiño et al, 2007;Sadeghian et al, 2019). An important part of this variability is related to the localized application of organic and inorganic fertilizers, which increases the contents of the element, especially in the first 0.05m of depth (Arias and Sadeghian, 2011;Nze Memiaghe et al, 2021).…”

Section: Resultsmentioning

confidence: 99%

Soil vulnerability index to climatic variability in coffee regions of Colombia

Lince-Salazar¹,

Sadeghian²,

Díaz-Poveda³

2021

rcia

View full text Add to dashboard Cite

Global climate change is one of the main factors threatening agriculture. In this context, variations in precipitation have the strongest effect on soil fertility, plant nutrient availability, and erosion. This research aimed to assess soil vulnerability to climate variability in the central coffee-growing region of Colombia. This study analyzed soil components involved in the sustainability of the coffee production system as affected by extreme high and low precipitation events. For evaluation, three sensitivity indices were constructed, with a weighted aggregation structure and with weight values defined from expert knowledge. The indices were estimated by randomly selecting 432 coffee farms in the municipalities of Balboa and Santuario in Risaralda department and Salamina in Caldas department. The soil nutrient availability and conservation vulnerability index was moderate in the three municipalities (Balboa=2.87 and coefficient of variation-CV 13%; Santuario=2.88 and CV 10%; Salamina=2.9 and CV 9%). The soil leaching vulnerability index was very low in Balboa (4.33 and CV 3%) and Salamina (4.74 and CV 7%) and low in Santuario (3.57 and CV 19%). The soil loss vulnerability index was low in Balboa (3.32 and CV 10.03%) and Salamina (3.49 and CV 11.43%) and moderate in Santuario (3.13 and CV 9.34%). Lastly, the vulnerability of coffee-growing soil to climate variability was low in Balboa (3.33) and Salamina (3.45) and moderate in Santuario (3.09). Based on these results, in the three municipalities, coffee growers must introduce farming practices towards improving soil resilience and decreasing soil vulnerability to high and low precipitation extremes by adequately managing the sources and doses of fertilizers, soil conditioners, and compost and by implementing integrated management of weeds and litterfall.

show abstract

Spatial Variability of Soil Phosphorus Indices under Two Contrasting Grassland Fields in Eastern Canada

Cited by 7 publications

References 62 publications

Tillage Management Impacts on Soil Phosphorus Variability under Maize–Soybean Rotation in Eastern Canada

Tillage Management Impacts on Soil Phosphorus Variability under Maize–Soybean Rotation in Eastern Canada

Analysis of Four Delineation Methods to Identify Potential Management Zones in a Commercial Potato Field in Eastern Canada

Soil vulnerability index to climatic variability in coffee regions of Colombia

Contact Info

Product

Resources

About