Decimetric‐Scale Two‐Dimensional Distribution of Soil Phosphorus after 20 Years of Tillage Management and Maintenance Phosphorus Fertilization

Cambouris, Athyna N.; Messiga, Aimé J.; Ziadi, Noura; Perron, Isabelle; Morel, Christian

doi:10.2136/sssaj2017.03.0101

Cited by 4 publications

(10 citation statements)

References 29 publications

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“…Thus, R 2 CV should also be considered as an important reliability factor for mapping soil P indicators in grassland fields to prevent P pollution. Some authors [58] reported lower R 2 CV values (0.0-0.20), while others [20,35] found higher R 2 CV values (0.59-0.62) for soil-available P. In this study, the lowest R 2 CV values obtained may be explained by the weak spatial structure of the soil P obtained, as suggested by Kravchenko [61].…”

Section: Spatial Distribution Of Soil Phosphorus Indices and Other So...supporting

confidence: 42%

“…The spatial dependence of soil P indices in both YG and OG soil layers was moderate (31% to 71%) as a result of the interaction between soil intrinsic and extrinsic factors, such as intensive fertilization or farming practices. Many authors [18,20,33,[54][55][56][57][58] have found moderate spatial dependence for soil P, while others [3,19,42,50] have reported strong spatial dependence for soil P (R > 75%) in their respective studies conducted on different scales. The strong spatial dependence of soil-available P observed in these studies may be attributable to the strong influence of intrinsic factors, such as different soil types or soil series, on the spatial distribution of soil-available P at different agricultural, local, or regional scales.…”

Section: Spatial Dependence Of Soil Phosphorus Indices and Other Soil...mentioning

confidence: 99%

“…Repeated applications of organic fertilizers and other agronomical practices such as no-till soil may increase soil P accumulation in the first 5 cm of soil in agricultural fields [58,73,74], including grasslands [43]. This points to the importance of developing an effective soil sampling optimization strategy to provide better guidance for practical grassland management.…”

Section: Agronomic and Environmental Implicationsmentioning

confidence: 99%

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

et al. 2020

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Phosphorus (P) is an essential nutrient for grassland production systems. However, continuous applications of P fertilizers result in soil P accumulations, increasing the risk of P losses in runoff and erosion. This study aims to investigate the field-scale variability of soil-test P (STP) in two contrasting grassland fields using descriptive statistics and geostatistics for accurate recommendations on soil sampling strategy and sustainable approaches to P management. A young grassland (YG; 2 years) and an old grassland (OG; 10 years under permanent pasture) were classified as humo-ferric podzol and received organic fertilizers. Soil samples were collected in 16-m by 16-m triangular grids at two depths (0–5 and 5–20 cm). They were analyzed for available P and other soil elements extracted using the Mehlich-3 method (M3). The agri-environmental P saturation index (P/Al)M3 was calculated. Phosphorus accumulation was observed in OG (0–5 cm) as a result of long-term manure applications. Repeated applications of organic fertilizers can impact the long-term buildup of soil P, thus decreasing soil P va-riability and spatial dependence in permanent grasslands. A soil sampling strategy focusing on the 0–5 cm layer should be retained in permanent grasslands for sustainable P recommendations in Eastern Canada.

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Section: Spatial Distribution Of Soil Phosphorus Indices and Other So...supporting

confidence: 42%

Section: Spatial Dependence Of Soil Phosphorus Indices and Other Soil...mentioning

confidence: 99%

Section: Agronomic and Environmental Implicationsmentioning

confidence: 99%

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

et al. 2020

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“…Many studies [2,[28][29][30][31][32] have examined the spatial variability of soil P under various tillage systems at different sampling, plot or field scales. Cambouris et al [33] characte-rized the distribution of Mehlich-3 P (P M3 ) concentrations and agri-environmental P saturation (P/Al) M3 at decimetric scale in NT and moldboard plow (MP) plots in a long-term maizesoybean rotation (>20 yr). They observed high CVs associated with P M3 data in both MP (77% and 63% at 0-5 and 5-20 cm, respectively) and NT plots (46% and 66% at 0-5 and 5-20 cm, respectively).…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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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.

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“…Nowadays, precision agriculture (PA) is defined as a complication of operations and tools to assess farming needs and apply them precisely in the optimal location at the most opportune time [16,17]. This approach involves more precise seeding, fertilizer, irrigation, and pesticide input in order to optimize crop production for the purpose of increasing grower revenue and protecting the environment [18]. The advent of electric-driven control systems has significantly expanded the scope for integrating technological advancements in automation into various PA applications [19,20].…”

Section: Introductionmentioning

confidence: 99%

Development of a Variable-Rate Spraying System for Small Amounts of Liquid Rhizobial Inoculation Based on Increment PID Control

Zhang,

Hou,

Zheng

et al. 2024

Preprint

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: To improve the efficiency of rhizobial inoculation operations and address the current situation of rhizobial inoculation being labor-intensive, a spraying and control system for variable rate application (VRA) of liquid rhizobia was developed. The system can accurately regulate the spraying rate of liquid rhizobia according to the desired rate of rhizobia by incremental Proportional Integral Derivative (PID) closed-loop control algorithm, making it particularly suitable for precise spraying with small amounts. In the laboratory experiment of precise flow control, variation coefficient of spraying nozzle from 0.10 MP to 0.20 MP pressure were no more than 1.2%. A clear linear relationship was observed between the spraying rate and pressure. The maximum response time was 1.93 seconds, while the average response time was 1.62 seconds when controlling the spraying system for small amounts. Field trial was conducted in Heilongjiang Agricultural Xianghe Farm of China. Average seeds number and 100-seed weight of soybean plant with rhizobia inoculation treatment were better than control group, and average yield of spraying liquid rhizobia agent with full base fertilizer increased by 232.5 kg/hm2, representing a significant 7.4% improvement over the control group. The results of these trails clearly showed the positive effect of the spraying and control system for liquid rhizobial inoculation, which has superior to existing inoculation manners, and provides an important technical support for the widespread adoption of rhizobia technology.

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Decimetric‐Scale Two‐Dimensional Distribution of Soil Phosphorus after 20 Years of Tillage Management and Maintenance Phosphorus Fertilization

Cited by 4 publications

References 29 publications

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

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

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

Development of a Variable-Rate Spraying System for Small Amounts of Liquid Rhizobial Inoculation Based on Increment PID Control

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