Fernando E. Miguez

Fernando E. Miguez
Iowa State University | ISU · Department of Agronomy

PhD Crop Sciences

About

113
Publications
44,206
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
4,614
Citations
Additional affiliations
May 2016 - April 2017
Iowa State University
Position
  • Professor (Associate)
January 2010 - present
Iowa State University
Position
  • Research Assistant

Publications

Publications (113)
Conference Paper
On-farm research networks (hereafter called OFRN) are managed by groups of farmers conducting trials on their own farms. OFRNs are becoming popular because they allow farmers to assess new management practices under on-farm conditions. Data collected in OFRN can be used to estimate the mean effect of specific cropping practices on crop yields and t...
Article
Full-text available
Agronomic research provides management recommendations based on small-plot trials (SPTs) and on-farm trials (OFTs) with very different characteristics. SPTs are traditionally conducted at agricultural experiment stations by research institutes or universities, while OFTs are conducted under commercial-scale conditions and managed by farmers using t...
Article
Full-text available
For decades, agronomists have invested time and resources to identify the optimum nitrogen (N) rates for cereal crops. The most common method for estimating the agronomic optimum N rate (AONR) is to design a field experiment with several N fertilizer rates and fit a regression model to the yield observations. Here, we concentrate on its accuracy an...
Article
The Fertilizer Recommendation Support Tool (FRST) will perform correlations between soil nutrient concentrations and crop response to fertilization from user‐selected datasets in the FRST national database. Yield response for the nutrient of interest in a particular site‐year is presented as relative yield (RY), a ratio of unfertilized yield to the...
Article
The central motivation for mechanistic crop growth simulation has remained the same for decades: to reliably predict changes in crop yields and water usage in response to previously unexperienced increases in air temperature and CO2 concentration across different environments, species, and genotypes. Over the years, individual process-based model c...
Preprint
Full-text available
Gaussian linear models with random group-level effects are the standard for modeling randomized experiments carried out over groups, such as locations, farms, hospitals, or schools. Group-level effects can be summarized by prediction intervals for group-level means or responses, but the quality of such summaries depends on whether the intervals are...
Article
As we face today's large-scale agricultural issues, the need for robust methods of agricultural forecasting has never been clearer. Yet, the accuracy and precision of our forecasts remains limited by current tools and methods. To overcome the limitations of process-based models and observed data, we iteratively designed and tested a generalizable a...
Article
Rolling hill topography is common in agricultural land throughout the Southeastern United States. In areas of complex topography, downslope movement of soil nutrients and water can lead to nutrient losses and soil degradation, as well as spatial yield variability. Additionally, differences in the accumulation of water, slope aspect, and crop biomas...
Article
No-till management is a proven practice for increasing soil organic matter in many environments. By increasing soil organic matter, no-till may increase soil N mineralization, potentially reducing crop demand for N fertilizer relative to inversion tillage. In this study, we hypothesized that, relative to inversion tillage (moldboard plowing), long-...
Article
Prediction of soybean seed yield and seed composition at a plot scale before harvesting has potential uses in breeding programs for early-season selection and harvesting decisions. Reflectance information from hyperspectral bands have been mainly used for predicting yield and other crop variables. However, an analysis comparing the prediction accur...
Article
Full-text available
Regional and global impact assessment tools are increasingly used to explore and evaluate the impact of climate change and extreme events on crop yield and environmental externalities. However, the large uncertainties associate with the inputs or the parameters in crop models within these tools, limits their predictive ability, exceeding the spatio...
Article
Full-text available
Increasing temperatures in the U.S. Midwest are projected to reduce maize yields because warmer temperatures hasten reproductive development and, as a result, shorten the grain fill period. However, there is widespread expectation that farmers will mitigate projected yield losses by planting longer season hybrids that lengthen the grain fill period...
Article
Full-text available
Botrytis cinerea, a fungal pathogen that causes gray mold on grapes, can decrease yield, substantially reduce wine quality, and therefore cause significant economic losses. In a context of increasing awareness of environmental and human health, biopesticides are a potential alternative to synthetic chemical treatments to produce grapes and wine in...
Article
Full-text available
Age‐related changes are usually overlooked in perennial grass research; when they are considered it is usually as a change in plant size (e.g. biomass). Whether other physiological or developmental aspects change as stands age, and how those aspects may impact long‐term stand dynamics, remains unclear. Conventional experimental designs study a sing...
Conference Paper
Full-text available
Soybean yields in Indonesia tend to be low, on average <1.5 Mg ha-1 and many of the needs are met through soybean imports. The purpose of this study was to determine the effect of seed coating and sodium bicarbonate on the growth and yield of soybeans in alluvial soils. The experiment was carried out at Alluvial soil in Padang, with an altitude of...
Article
Full-text available
International agreements aim to conserve 17% of Earth's land area by 2020 but include no area-based conservation targets within the working landscapes that support human needs through farming, ranching, and forestry. Through a review of country-level legislation, we found that just 38% of countries have minimum area requirements for conserving nati...
Article
Full-text available
Variability is inherent to the world around us. Its quantification is essential to understand processes of interest in environmental and social sciences, such as adaptation of species to climate change or social inequality. Variance, one of the parameters of the normal distribution, is commonly used to quantify variability. Classical linear models...
Article
The aim of on-farm research is to identify and test a new technology, product or management practice (e.g. more efficient seeding rate, enhanced row spacing, better disease management treatment, etc.) suited to local conditions by comparing it to a standard farmer practice across several farmers’ fields. Typically, each trial includes two treatment...
Article
The on‐farm research network concept enables a group of farmers to test new agricultural management practices under local conditions with support from local researchers or agronomists. Different on‐farm trials based on the same experimental design are conducted over several years and sites to test the effectiveness of different innovative managemen...
Article
Biochar has the potential to increase crop yields when applied to agricultural land. We integrate agronomic and economic simulation models to determine the expected yield increase from biochar applications in the United States. We calculate the location-specific willingness to pay of U.S. farmers to apply biochar to their cropland if biochar increa...
Article
Full-text available
An on-farm research network is an organization of farmers that conducts agronomic experiments under local conditions. It is common that an elementary statistical analysis be conducted for individual studies. However, there is unexplored potential in detecting yield response variability patterns for better deci- sion making. We developed a data-anal...
Article
Full-text available
Thermal time (TT) is an agro-climate index widely established and used in predicting plant development based on temperature. This index is a powerful tool for measuring multi-faceted changes in temperature occurring from climate change. In the present study, TT was calculated for the entire frost-free period and individual spring, summer, and fall...
Article
Full-text available
Much field research on perennial bioenergy crops confounds effects of plant age with those of the growing season, which increases uncertainty and the potential for erroneous conclusions, particularly in maturing stands. Most studies rely on stands planted in a single year and measured across multiple subsequent seasons. These “single-start” designs...
Article
Full-text available
1. Increasingly, often ecologist collects data with nonlinear trends, heterogeneous variances, temporal correlation, and hierarchical structure. Nonlinear mixed‐effects models offer a flexible approach to such data, but the estimation and interpretation of these models present challenges, partly associated with the lack of worked examples in the ec...
Article
This study investigates the sensitivity of greenhouse gas (GHG) emissions and the minimum fuel selling price for a 2000 metric ton day−1 integrated pyrolysis‐bioenergy‐biochar platform with respect to the biorefinery location and biomass types. The regional techno‐economic and life‐cycle analysis is evaluated in three US counties using representati...
Article
Cover crops provide environmental services that can effectively reduce the negative impacts from otherwise highly productive row-crop systems in the US Midwest. In this context, winter rye is the most commonly used cover crop among producers because it overwinters and produces considerable biomass in the spring. While the soil and water benefits of...
Article
Full-text available
The heating of biomass under low-oxygen conditions generates three co-products, bio-oil, biogas, and biochar. Bio-oil can be stabilized and used as fuel oil or be further refined for various applications and biogas can be used as an energy source during the low-oxygen heating process. Biochar can be used to sequester carbon in soil and has the pote...
Article
Ecological intensification aims to increase crop productivity by enhancing biodiversity and associated ecosystem services, while minimizing the use of synthetic inputs and cropland expansion. Policies to promote ecological intensification have emerged in different countries, but they are still scarce and vary widely across regions. Here, we propose...
Article
Full-text available
The possibility that N fertilizer increases soil organic matter (SOM) mineralization and, as a result, reduces SOM stocks has led to a great debate about the long-term sustainability of maize-based agroecosystems as well as the best method to estimate fertilizer N use efficiency (FNUE). Much of this debate is because synthetic N fertilizer can posi...
Article
Physical properties of biochar such as small particle size and high porosity can modify soil properties and help to improve soil water dynamics. However, there has been no consistent long-term measurements of change in soil physical properties due to biochar application under real field conditions. In this study, we use a unique dataset of soil wat...
Article
Potentially mineralizable nitrogen (PMN) is considered an important indicator of soil health. Cropping systems management can affect PMN. However, the effect size and relationship with crop yield across specific management practices remain uncertain. We conducted a quantitative review to understand how conservation agriculture management practices...
Article
Full-text available
This study uses partial budgets to assess the annual net private economic returns to cover crop use in Midwest row crop farms. Data were compiled through an online survey to farm operators that manage production systems with and without cover crops. The average net returns to cover crops terminated with herbicides followed by corn was negative, but...
Article
Full-text available
Despite being generally accepted as a promising conservation practice to reduce nitrate pollution and promote soil sustainability, cover crop adoption in Midwestern US agriculture is low. Based on focus groups, surveys and partial budgets, we calculated the annual net returns to cover crop use for farmers in Illinois, Iowa and Minnesota; and elicit...
Article
Biomass sorghum (Sorghum bicolor L. Moench) is a candidate bioenergy feedstock for the U.S. Midwest. Research suggests that biomass sorghum is more drought tolerant and has higher water-use-efficiency (WUE) than maize (Zea mays L.) in water-limiting environments, but most species comparisons of the seasonal evapotranspiration (total ET) and WUE hav...
Article
Full-text available
Five research teams identified parallel obstacles when concurrently attempting to conduct meta-analyses on the air and water quality impacts of on-farm 4R nutrient management practices. Across projects, system complexity and the lack of relevant data from cultivated and grassland agriculture field trials impeded the application of standard meta-ana...
Article
Full-text available
Reduction of CO2 emissions will require a transition from fossil fuels to alternative energy sources. Expansion of Brazilian sugarcane ethanol1,2 provides one near-term scalable solution to reduce CO2 emissions from the global transport sector. In contrast to corn ethanol, the Brazilian sugarcane ethanol system may offset 86% of CO2 emissions compa...
Chapter
Nonlinear statistical models continue to be relevant because they have the advantages of simplicity, flexibility, and parsimony when used in the analysis and description of agricultural data. Often nonlinear models can be easier to interpret than other alternatives. These models have been applied to data ranging from leaf-level to landscape-level p...
Article
Full-text available
Biochar application to soils is a promising practice with agronomic and environmental benefits. Our analysis is based on an experiment in which soil columns were incubated with 3 biochar application rates (0%, 3% and 6% w/w), two application methods and three replications. Soil water retention curves (SWRC) were determined at three sampling times,...
Article
Full-text available
Ideal bioenergy feedstocks are low in nutrients that act as anti-quality factors during conversion processes. Research has shown that delaying harvest of temperate perennial grasses until late winter reduces nutrient content, primarily due to end-season resorption, but also indicates a role for foliar nutrient leaching. While end-season resorption...
Article
Full-text available
Winter cover crops (WCCs) provide agronomic and environmental benefits, although their impacts on subsequent crop yields have been reported to vary across regions, soils, or under different farm practices. To address the variability in response, previous qualitative and quantitative reviews have summarized the overall yield effects of WCCs. However...
Article
A recent study in Carbon Management, by Bach et al., argues that biochar amendments’ positive impacts on crop yields and soil carbon sequestration have been overestimated, and biochar amendment to soil is hence unlikely to be an economically viable technique for cropping system management or C abatement. We question the data selection and analysis...
Article
Because of rising fuel prices and increasing energy demand, bioethanol has been recognized as an important future renewable energy source. The goals and mandates developed for renewable fuel production will require construction of several bioethanol plants throughout the U.S. Using high-resolution geospatial data from Geographic Information Systems...
Technical Report
Full-text available
It is critical, given an increasingly variable climate and occurrence of extreme weather events, to develop and test management approaches that increase the adaptive capacity of corn-based agriculture, and equip farmers and land managers to be functionally resilient.The findings, implications and recommendations in this report represent research co...
Article
Full-text available
Cover crops are known to promote many aspects of soil and water quality, yet estimates find that in 2012 only 2.3% of the total agricultural lands in the Midwestern USA were using cover crops. Focus groups were conducted across the Corn Belt state of Iowa to better understand how farmers confront barriers to cover crop adoption in highly intensive...
Article
Full-text available
Nitrogen fertilization is critical to optimize short-term crop yield, but its long-term effect on soil organic C (SOC) is uncertain. Here, we clarify the impact of N fertilization on SOC in typical maize-based (Zea mays L.) Midwest U.S. cropping systems by accounting for site-to-site variability in maize yield response to N fertilization. Within co...
Data
Synthesis of long-term changes in soil organic C in topsoil vs. deeper soil. Data were compiled from studies of Upper Midwest U.S. Mollisols under agricultural management [11,50–54]. The dataset includes only chisel-plow tillage systems. The percentage change in soil organic C (SOC) for the topsoil was positively correlated with the percentage chan...
Data
Economic Optimum N Rates for each cropping system within each study location. Economic Optimum N Rates (EONRs) were calculated using yield response curves shown in Fig 2 and assuming a price ratio of $0.0056 kg N-1/$1 Mg maize grain-1. The estimated soil organic C changes at the EONRs for each cropping system were determined using regression curves...
Data
Soil organic C and N concentrations and soil bulk density. Means and standard deviations of initial and final soil organic C and total N concentrations are presented for each N rate within each cropping system at the four study locations. Means and standard deviations of bulk density are provided for each cropping system at each study location. (XL...
Article
Teaching sustainability concepts to multidisciplinary classes of engineering students is challenging due to their diverse background and discipline-specific skill set and the interdisciplinary nature of the sustainability issues at stake. The present study was conducted to understand the challenges and identify opportunities for improving teaching...
Article
Full-text available
Breeding for higher grain yield in maize (Zea mays L.) using increased selection densities has produced varieties that are adapted to grow at higher population densities. While the effects of density on final grain yield and plant pheno-types are well known, how density affects the early-season growth of the plant has been less studied. The objecti...
Technical Report
Full-text available
Corn is the major cereal crop of the United States, with two-thirds of national corn and soybean acreage concentrated in the upper Midwest. Farmers in the region have highly specialized knowledge and experience with these crops and considerable capital and infrastructure investments. It is critical, given an increasingly variable climate and occurr...
Article
Full-text available
Increasing soil carbon content via agricultural practices not only enhances the production potential of the land, but also counteracts rising atmospheric CO2 levels. When predicting production systems’ effects on soil carbon, quantifying CO2 efflux derived from live roots is of particular importance as it is a through-flux and does not signify depl...
Research
Full-text available
Answering Common Producer Questions on Cover Crop Use in Iowa