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- Author:
- Mark E. Lundy, et al. ; Telha H. Rehman; Bruce A. Linquist; Show all 3 Authors
- Source:
- Remote Sensing 2022 v.14 no.12 pp. -
- ISSN:
- 2072-4292
- Subject:
- grain yield; nitrogen; nitrogen fertilizers; normalized difference vegetation index; panicles; rice; total nitrogen; unmanned aerial vehicles; vegetation; California
- Abstract:
- ... Reflectance-based vegetation indices can be valuable for assessing crop nitrogen (N) status and predicting grain yield. While proximal sensors have been widely studied in agriculture, there is increasing interest in utilizing aerial sensors. Given that few studies have compared aerial and proximal sensors, the objective of this study was to quantitatively compare the sensitivity of aerially sensed ...
- DOI:
- 10.3390/rs14122770
- https://doi.org/10.3390/rs14122770
- Author:
- Mark E. Lundy, et al. ; Taylor S. Nelsen; Show all 2 Author
- Source:
- Agronomy journal 2020 v.112 no.6 pp. 4705-4722
- ISSN:
- 0002-1962
- Subject:
- Hordeum vulgare; agroecosystems; agronomy; barley; grain protein; leaf reflectance; nitrogen; nitrogen fertilizers; normalized difference vegetation index; protein content; tillering; California
- Abstract:
- ... Malting barley (Hordeum vulgare) requires precise nitrogen (N) fertilizer management to achieve a narrow range of grain protein content (∼9–10.5%) while maintaining yields, but practical tools to accomplish this are lacking. This study hypothesized that canopy reflectance (Normalized Difference Vegetation Index (NDVI)) measured at tillering (Feekes 2–3) and expressed as a sufficiency index (SI), c ...
- DOI:
- 10.1002/agj2.20397
- https://doi.org/10.1002/agj2.20397
- Author:
- Mark E. Lundy, et al. ; Taylor Becker; Taylor S. Nelsen; Michelle Leinfelder-Miles; Show all 4 Authors
- Source:
- Agronomy 2020 v.10 no.11 pp. -
- ISSN:
- 2073-4395
- Subject:
- agronomy; cameras; corn; cropping systems; crops; deficit irrigation; grain yield; information; leaf reflectance; leaves; methodology; nitrogen; reflectance; research; unmanned aerial vehicles; water; water stress
- Abstract:
- ... The objective of this research was to determine if canopy reflectance measured by an Unmanned Aerial Vehicle (UAV) equipped with a 5-band multi-spectral camera can differentiate between water and nitrogen (N) deficiency in irrigated maize. Crop reflectance was used to generate a Normalized Difference Red Edge (NDRE), Green Leaf Index (GLI), and a Blue Reflectance Index (BRI). These indices were th ...
- DOI:
- 10.3390/agronomy10111671
- https://doi.org/10.3390/agronomy10111671
- Author:
- Mark E. Lundy, et al. ; Daniela R. Carrijo; Bruce A. Linquist; Show all 3 Authors
- Source:
- Field crops research 2017 v.203 pp. 173-180
- ISSN:
- 0378-4290
- Subject:
- carbon; crops; drying; grain yield; growing season; irrigation; meta-analysis; rice; soil water; soil water potential
- Abstract:
- ... Rice systems provide a major source of calories for more than half of the world’s population; however, they also use more water than other major crops. Alternate wetting and drying (AWD) is an irrigation practice (introduction of unsaturated soil conditions during the growing season) that can reduce water inputs in rice, yet it has not been widely adopted, in part, due to the potential for reduced ...
- DOI:
- 10.1016/j.fcr.2016.12.002
- https://doi.org/10.1016/j.fcr.2016.12.002
- Author:
- Mark E. Lundy, et al. ; Cameron M. Pittelkow; Xinqiang Liang; Bruce A. Linquist; Kees Jan van Groenigen; Juhwan Lee; Natasja van Gestel; Johan Six; Rodney T. Venterea; Chris van Kessel; Show all 10 Authors
- Source:
- Nature 2015 v.517 no.7534 pp. 365-368
- ISSN:
- 0028-0836
- Subject:
- agroecosystems; climate; climate change; conventional tillage; cover crops; crop residues; crop rotation; crop yield; disturbed soils; environmental impact; meta-analysis; no-tillage; planting; small-scale farming; socioeconomic factors; South Africa; South Asia
- Abstract:
- ... One of the primary challenges of our time is to feed a growing and more demanding world population with reduced external inputs and minimal environmental impacts, all under more variable and extreme climate conditions of the future. Conservation agriculture (CA) represents a set of three crop management principles (direct planting of crops with minimum soil disturbance (i.e. no-till), permanent so ...
- Handle:
- 10113/60480
- DOI:
- 10.1038/nature13809
- https://doi.org/10.1038/nature13809
- Author:
- Mark E. Lundy, et al. ; Cameron M. Pittelkow; Bruce A. Linquist; Xinqiang Liang; Kees Jan van Groenigen; Juhwan Lee; Johan Six; Rodney T. Venterea; Chris van Kessel; Show all 9 Authors
- Source:
- Field crops research 2015 v.183 pp. 204-210
- ISSN:
- 0378-4290
- Subject:
- agriculture; climate change; conventional tillage; crop yield; crops; data collection; duration; fertilizer rates; literature; nitrogen; nitrogen fertilizers; no-tillage; prediction; subtropics; temperate zones; tropics
- Abstract:
- ... Conservation agriculture (CA) has been promoted as a method of sustainable intensification and climate change mitigation and is being widely practiced and implemented globally. However, no-till (NT), a fundamental component of CA, has been shown to reduce yields in many cases. In order to maintain yields following adoption of CA, it has been recently suggested that fertilizer application should be ...
- Handle:
- 10113/61324
- DOI:
- 10.1016/j.fcr.2015.07.023
- https://doi.org/10.1016/j.fcr.2015.07.023
- Author:
- Mark E. Lundy, et al. ; David F. Spencer; Chris Van Kessel; James E. Hill; Bruce A. Linquist; Show all 5 Authors
- Source:
- Field crops research 2012 v.131 no. pp. 81-87
- ISSN:
- 0378-4290
- Subject:
- harvesting; Nostoc; rice; water quality; fertilizer application; seedlings; phosphorus fertilizers; soil; grain yield; planting; phosphorus; drainage water; crops
- Abstract:
- ... In water-seeded rice systems, cyanobacteria (Nostoc spongiaeforme) hinder early-season crop growth by dislodging and reducing light to seedlings. Since algae are often phosphorus (P) limited, we investigated whether changing the timing of P fertilizer application could reduce algal growth without reducing crop yields or increasing mid-season water P concentrations to levels of concern for water qu ...
- DOI:
- 10.1016/j.fcr.2012.03.005
- https://doi.org/10.1016/j.fcr.2012.03.005
- Author:
- Mark E. Lundy, et al. ; Cameron M. Pittelkow; Bruce A. Linquist; Xinqiang Liang; Kees Jan van Groenigen; Juhwan Lee; Natasja van Gestel; Johan Six; Rodney T. Venterea; Chris van Kessel; Show all 10 Authors
- Source:
- Field crops research 2015 v.183 pp. 156-168
- ISSN:
- 0378-4290
- Subject:
- Gossypium hirsutum; Oryza sativa; Triticum aestivum; conventional tillage; corn; cotton; crop management; crop yield; crops; dry environmental conditions; environmental quality; fertilizer application; food production; humid zones; input costs; latitude; legumes; meta-analysis; nitrogen fertilizers; no-tillage; oilseeds; rice; soil erosion; temperate zones; tropics; wheat
- Abstract:
- ... No-till agriculture represents a relatively widely adopted management system that aims to reduce soil erosion, decrease input costs, and sustain long-term crop productivity. However, its impacts on crop yields are variable, and an improved understanding of the factors limiting productivity is needed to support evidence-based management decisions. We conducted a global meta-analysis to evaluate the ...
- Handle:
- 10113/61416
- DOI:
- 10.1016/j.fcr.2015.07.020
- https://doi.org/10.1016/j.fcr.2015.07.020