Results 101 to 110 of about 2,697,606 (306)

Analysis of a longitudinal multilevel experiment using GAMLSSs [PDF]

arXiv, 2018
The standard procedures for analysing hierarquical or grouped data are by (non)linear mixed models or generalized mixed models. However, the generalized additive models for location, scale and shape (GAMLSSs) also allow different types of random effects to be included in the model formulation. Even though already popular in many areas of research, this
arxiv  

Modelling the Impact of Drained and Undrained Conditions on GHG Emissions in Croplands: A Case Study in Lincolnshire, UK

Irrigation and Drainage, EarlyView.
ABSTRACT Agricultural drainage plays a crucial role in land management and crop productivity but significantly impacts greenhouse gas (GHG) emissions. This study examines the effects of drained and undrained soil conditions on GHG emissions in croplands via a case study in Lincolnshire, United Kingdom.
Talha Özçelik, Matthias Kuhnert
wiley   +1 more source

Concurrent Response of Soybean to Fixed (Full and Limited) and Variable Rate Irrigation Management in Three Soil Types: II. Growth, Yield, Evapotranspiration and Water Productivity

Irrigation and Drainage, EarlyView.
ABSTRACT Soybean growth, yield, crop evapotranspiration (ETc) and crop water use efficiency (CWUE or crop water productivity, CWP) under different irrigation levels in three different soil types in the same field were investigated concurrently. Treatments in each soil type were: (i) variable rate irrigation (VRI), (ii) fixed rate full irrigation (FR‐1″)
S. Irmak, T. A. Hinn
wiley   +1 more source

Concurrent Response of Soybean to Fixed‐ (Full and Limited) and Variable‐Rate Irrigation Management in Three Soil Types: I. Soil Water Dynamics

Irrigation and Drainage, EarlyView.
ABSTRACT This research investigated soybean soil water dynamics under different irrigation levels in three different soil types in the same field concurrently. Treatments imposed in each soil type were: (i) variable‐rate irrigation (VRI), (ii) fixed‐rate full irrigation (FRI‐1″ or FRI‐25.4 mm) and (iii) fixed‐rate limited irrigation (FRI‐0.75″ or FRI ...
S. Irmak, T. A. Hinn, M. S. Kukal, A. T. Mohammed   +3 more
wiley   +1 more source

A short history of the phosphorus index and Andrew Sharpley's contributions from inception through development and implementation

Journal of Environmental Quality, EarlyView.
Abstract In the 1980s, growing recognition of agricultural phosphorus (P) sources to surface water eutrophication led to scrutiny of animal feeding operations. In 1990, the USDA‐Natural Resources Conservation Service (NRCS) invited prominent scientists to find a solution. It was at an initial meeting that Dr. Andrew Sharpley suggested that P assessment
Deanna L. Osmond, Peter J. A. Kleinman, Frank Coale, Nathan O. Nelson, Carl H. Bolster, Josh McGrath   +5 more
wiley   +1 more source

The importance of consensus science to managing phosphorus in the environment: SERA‐17 and the legacy of Andrew Sharpley

Journal of Environmental Quality, EarlyView.
Abstract Phosphorus (P) loss from agricultural systems to surface waters, and ultimately, eutrophication, presents a wicked problem requiring transdisciplinary solutions. The mission of SERA‐17 (Southern Extension and Research Advisory Information Exchange Group‐17) has been to address this problem by developing “Innovative Solutions to Minimize ...
Merrin L. Macrae, Peter J. A. Kleinman, Deanna Osmond, Amy Shober, Nathan Nelson   +4 more
wiley   +1 more source

Balancing agriculture and environment: Andrew Sharpley's nutrient, soil, and water management legacy

Journal of Environmental Quality, EarlyView.
Abstract Managing agricultural phosphorus (P) to balance food security and water quality priorities is a massive challenge fraught with uncertainty and competing interests. Throughout his career, Andrew Sharpley addressed this challenge by building our understanding of the fundamental principles and processes that control P behavior in agricultural ...
D. N. Flaten, P. J. A. Kleinman, D. L. Osmond   +2 more
wiley   +1 more source

A review of the development and implementation of the critical source area concept: A reflection of Andrew Sharpley's role in improving water quality

Journal of Environmental Quality, EarlyView.
Abstract Critical source areas (CSAs) are small areas of a field, farm, or catchment that account for most contaminant loss by having both a high contaminant availability and transport potential. Most work on CSAs has focused on phosphorus (P), largely through the work in the 1990s initiated by Dr.
Richard McDowell, Peter J. A. Kleinman, Philip Haygarth, Joshua M. McGrath, Douglas Smith, Louise Heathwaite, Antti Iho, Oscar Schoumans, David Nash   +8 more
wiley   +1 more source

Toward better targeting of mitigation measures for reducing phosphorus losses from land to water: Andrew Sharpley's legacy in Norway and Sweden

Journal of Environmental Quality, EarlyView.
Abstract Nordic agriculture faces big challenges to reduce phosphorus (P) loss from land to water for improving surface water quality. While understanding the processes controlling P loss and seeking for P mitigation measures, Norwegian and Swedish researchers have substantially benefited from and been inspired by Dr.
Jian Liu, Faruk Djodjic, Barbro Ulén, Helena Aronsson, Marianne Bechmann, Lars Bergström, Tore Krogstad, Katarina Kyllmar   +7 more
wiley   +1 more source

A Machine Learning Approach for Crop Yield and Disease Prediction Integrating Soil Nutrition and Weather Factors [PDF]

arXiv
The development of an intelligent agricultural decision-supporting system for crop selection and disease forecasting in Bangladesh is the main objective of this work. The economy of the nation depends heavily on agriculture. However, choosing crops with better production rates and efficiently controlling crop disease are obstacles that farmers have to ...
arxiv