Enhancing our understanding of optimal nitrogen fertilizer rates for maize: A synthesis of long-term experimentation and crop modeling DOI Open Access
Mitch Baum

Published: Jan. 1, 2023

Globally, agricultural systems face the complex challenges of producing enough food, fiber, and fuel to sustain a growing population while mitigating negative environmental consequences intensive management. To that end, optimizing nitrogen (N) fertilizer management has become major focus, as it is commonly most limiting nutrient maximizing cereal crop growth, over-application increases potential for reactive N leach into groundwater be emitted potent greenhouse gas. The goals this dissertation were 1) quantify interannual changes economic optimum rate enhancing our understanding tradeoff between production degradation; 2) improve capacity process-based model simulate yield response rate; 3) rank sensitivity individual environmental, management, genetic factors. meet goals, we used modeling measured grain yields from 14 long-term maize experiments across Iowa Illinois, USA, thereby allowing us temporal trends rates provide systems-level analysis using modeling. Analysis these data revealed have been increasing over time by 2.06 2.80 kg ha-1 yr-1 continuous following soybean rotation reducing below mitigate effects application will more severe on than reductions in losses. Moreover, solution models reproduce penalty identify bias associated with fitting simulated curves leading lower predict relative (RRMSE = 33 19%). Further complicating prediction rate, determined genetics, environment similar contributions annual rate. This serves benchmark guide future research priorities toward inform recommendations, research, policy decisions.

Language: Английский

Nitrogen fertilizer and plant density affect maize residue quantity and quality more than previous crop and genotype DOI
Alejo Ruiz, Jode W. Edwards, Michael J. Castellano

et al.

European Journal of Agronomy, Journal Year: 2024, Volume and Issue: 158, P. 127215 - 127215

Published: May 29, 2024

Language: Английский

Citations

2
HIDYM: A high-resolution gross primary productivity and dynamic harvest index based crop yield mapper DOI
Weiguo Yu, Dong Li, Hengbiao Zheng

et al.

Remote Sensing of Environment, Journal Year: 2024, Volume and Issue: 311, P. 114301 - 114301

Published: July 2, 2024

Language: Английский

Citations

2
Estimating nutrient concentrations and uptake in rice grain in sub-Saharan Africa using linear mixed-effects regression DOI Creative Commons
Tovohery Rakotoson, Kalimuthu Senthilkumar, Jean‐Martial Johnson

et al.

Field Crops Research, Journal Year: 2023, Volume and Issue: 299, P. 108987 - 108987

Published: June 3, 2023

Quantification of nutrient concentrations in rice grain is essential for evaluating uptake, use efficiency, and balance to develop fertilizer recommendation guidelines. Accurate estimation without relying on plant laboratory analysis needed sub-Saharan Africa (SSA), where farmers do not generally have access laboratories.The objectives are 1) examine if the macro- (N, P, K, Ca, Mg, S) micronutrients (Fe, Mn, B, Cu) can be estimated using agro-ecological zones (AEZ), production systems, soil properties, mineral application K) rates as predictor variables, 2) identify uptakes by best-fitted models with above variables provide improved prediction actual (predicted x yield) compared average-based (average SSA yield).Cross-sectional data from 998 farmers' fields across 20 countries 4 AEZs (arid/semi-arid, humid, sub-humid, highlands) 3 different systems: irrigated lowland, rainfed upland were used test hypotheses concentration being estimable a set among above-cited factors linear mixed-effects regression models.All 10 nutrients reasonably predicted [Nakagawa's R2 ranging 0.27 (Ca) 0.79 (B), modeling efficiency 0.178 0.584 (B)]. However, only K B was satisfactory superior 0.5. The country variable contributed more variation these than AEZ systems our best predictive models. There greater positive relationships (up 0.18 difference correlation coefficient R) between model estimation-based those uptakes. Nevertheless, uptake had significant improvement all investigated.Our findings suggest that exception associated high EF an over estimates macronutrient micronutrient obtained simply average each at regional scale SSA.Further investigation other such timing applications, variety, occurrence drought periods, atmospheric CO2 warranted accuracy concentrations.

Language: Английский

Citations

5
Nitrogen Fertilizer and Plant Density Affect Maize Residue Quantity and Quality More than Previous Crop and Hybrid DOI
Alejo Ruiz, Jode W. Edwards,

Mike Castellano

et al.

Published: Jan. 1, 2024

Download This Paper Open PDF in Browser Add to My Library Share: Permalink Using these links will ensure access this page indefinitely Copy URL DOI

Language: Английский

Citations

0
Crop residue harvest: a growing opportunity for greenhouse gas emissions abatement DOI Creative Commons
Tomás Della Chiesa, Sotirios V. Archontoulis, Daniel Northrup

et al.

Research Square (Research Square), Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 13, 2024

Abstract Near-term commitments to net-zero greenhouse gas emissions (GHG) require the agriculture sector reduce and sequester CO2. Harvesting of crop residues can contribute these goals; however, uncertainties about effects on grain yield, non-CO2 GHGs, soil health have led questions potential benefits residue harvest. Here, we show that harvest are underestimated growing because they do not account for increasing rates production attendant agronomic environmental partial In North America, maize is by > 100 kg ha-1y-1. Partial increase yield 6% N2O 30%. These greatest when paired with conservation tillage grow production. A systems approach integrates practices mitigate GHG promote farmer adoption.

Language: Английский

Citations

0
Exploring the Potential of Heterosis to Improve Nitrogen Use Efficiency in Popcorn Plants DOI Creative Commons
Talles de Oliveira Santos, Antônio Teixeira do Amaral Júnior, Rosimeire Barboza Bispo

et al.

Plants, Journal Year: 2023, Volume and Issue: 12(11), P. 2135 - 2135

Published: May 28, 2023

Nitrogen is crucial for plant growth and development, improving nitrogen use efficiency (NUE) a viable strategy reducing dependence on inputs promoting sustainability. While the benefits of heterosis in corn are well known, physiological mechanisms underlying this phenomenon popcorn less understood. We aimed to investigate effects traits four lines their hybrids under two contrasting conditions. evaluated morpho-agronomic such as leaf pigments, maximum photochemical PSII, gas exchange. Components associated with NUE were also evaluated. N deprivation caused reductions up 65% terms architecture, 37% 42% photosynthesis-related traits. Heterosis had significant traits, NUE, foliar particularly low soil N-utilization was found be mechanism favoring superior hybrid performance NUE. Non-additive genetic predominant controlling studied indicating that exploring most effective obtaining promote The findings relevant beneficial agro farmers seeking sustainable agricultural practices improved crop productivity through optimization utilization.

Language: Английский

Citations

1
Tiered maize and wheat nutrient removal coefficients estimated from available data DOI Creative Commons
Cameron I. Ludemann, Renske Hijbeek, Marloes P. van Loon

et al.

Nutrient Cycling in Agroecosystems, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 20, 2024

Abstract Estimates of cropland nutrient budgets at national to global scale generally rely on regional or mean coefficients for quantifying nutrients removed in crop yield and by-products. Use such values masks the variability these coefficients. Using maize wheat as examples, we assessed variation removal coefficients, namely harvest index (HI), nitrogen (N), phosphorus (P) potassium (K) concentrations products (Grain N, Grain P K respectively) residues (Residue Residue P, respectively). Variation was by three categories (Tiers) estimation. Statistical (mixed-effects) machine learning (random forest regression) models (Tier 3) were used predict using available predictor variables a level. Mean prediction accuracies (R 2 ) mixed-effects random 0.32 0.45 when based sub-selection mainly replicated field experiment data. When predictions applied on-farm data only, lower (mean R 0.08 0.36 in, dearth contributed poor accuracies. Until limitations are overcome, it is recommended use Tier (regional) coefficient estimates country balance efficiency estimates. Where not available, then average 1) can be used.

Language: Английский

Citations

0
Localized Versus Non-Localized data: its Effect on Maize Nutrient Removal, Efficiencies and Budgets at a Global Scale. DOI Open Access
Cameron I. Ludemann, Renske Hijbeek,

Marloes van Loon

et al.

Authorea (Authorea), Journal Year: 2023, Volume and Issue: unknown

Published: July 9, 2023

Estimates of cropland nutrient budgets and use efficiencies at national to global scales generally rely on average concentrations for quantifying nutrients removed in crop yield by-products. Given the relevance removal budgets, it is important that more locally relevant coefficients or models are developed. However, many countries do not have sufficient data from farm surveys field experiments. Using maize as an example, we assessed how much a country’s estimated affected when using either (Tier 1), regional 2) national/sub-national 3) estimates harvest index concentration products residues. nitrogen, phosphorus potassium varied substantially (up 52%), depending which Tier approach was used. This had substantial influence efficiencies. Our study shows large uncertainty associated with current offtake estimates. If available, 3 offers methodology overcome such limitations through application models, trained localized but widely available countries. We recommend 2 approaches once they been evaluated against real on-farm data. The presented can be applied other crops improve

Language: Английский

Citations

0
Comment on essd-2023-206 DOI Creative Commons
Peiyu Cao

Published: July 29, 2023

Abstract. Nutrient budgets help to identify excess or insufficient use of fertilizers and other nutrient sources in agriculture. They allow calculation indicators such as the balance (surplus deficit) efficiency that monitoring agricultural productivity sustainability across world. We present a global database country-level budget estimates for nitrogen (N), phosphorus (P) potassium (K) cropland. The database, disseminated FAOSTAT, is meant provide reference, synthesizing continuously updating state-of-the-art on this topic. covers 205 countries territories, well regional aggregates, period 1961 2020. Results highlight wide range efficiencies geographic regions, nutrients, time. For year 2020, data show average N surpluses from about 10 kg ha-1 year-1 Africa more than 90 Asia. Furthermore, they P K deficits 2020 Americas. This study introduces improvements over previous work relation key coefficients affecting estimates, especially removal crop products, manure content, atmospheric deposition biological fixation rates. conclude by discussing future research directions, highlighting need align statistical definitions groups, further refine plant livestock expand all land, including flows meadows pastures.

Language: Английский

Citations

0
Comment on essd-2023-206 DOI Creative Commons
Cameron I. Ludemann,

Nathan Wanner,

Pauline Chivenge

et al.

Published: Sept. 4, 2023

Abstract. Nutrient budgets help to identify excess or insufficient use of fertilizers and other nutrient sources in agriculture. They allow calculation indicators such as the balance (surplus deficit) efficiency that monitoring agricultural productivity sustainability across world. We present a global database country-level budget estimates for nitrogen (N), phosphorus (P) potassium (K) cropland. The database, disseminated FAOSTAT, is meant provide reference, synthesizing continuously updating state-of-the-art on this topic. covers 205 countries territories, well regional aggregates, period 1961 2020. Results highlight wide range efficiencies geographic regions, nutrients, time. For year 2020, data show average N surpluses from about 10 kg ha-1 year-1 Africa more than 90 Asia. Furthermore, they P K deficits 2020 Americas. This study introduces improvements over previous work relation key coefficients affecting estimates, especially removal crop products, manure content, atmospheric deposition biological fixation rates. conclude by discussing future research directions, highlighting need align statistical definitions groups, further refine plant livestock expand all land, including flows meadows pastures.

Language: Английский

Citations

0