The dynamics of crop yields in the U. S. Corn Belt as effected by weather and technological progress

1981 ◽  
Author(s):  
C. Arden Pope
Keyword(s):  
Technological Progress ◽  
Crop Yields ◽  
Corn Belt

scholarly journals Warming temperatures lead to reduced summer carbon sequestration in the U.S. Corn Belt

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Zhongjie Yu ◽  
Timothy J. Griffis ◽  
John M. Baker
Keyword(s):  
Crop Yields ◽  
Positive Impact ◽  
Dynamic Control ◽  
Primary Source ◽  
The United States ◽  
Corn Belt ◽  
Natural Ecosystems ◽  
Crop Growth Stage ◽  
Global Carbon

AbstractThe response of highly productive croplands at northern mid-latitudes to climate change is a primary source of uncertainty in the global carbon cycle, and a concern for future food production. We present a decadal time series (2007 to 2019) of hourly CO2 concentration measured at a very tall tower in the United States Corn Belt. Analyses of this record, with other long-term data in the region, reveal that warming has had a positive impact on net CO2 uptake during the early crop growth stage, but has reduced net CO2 uptake in both croplands and natural ecosystems during the peak growing season. Future increase in summer temperature is projected to reduce annual CO2 sequestration in the Corn Belt by 10–20%. These findings highlight the dynamic control of warming on cropland CO2 exchange and crop yields and challenge the paradigm that warming will continue to favor CO2 sequestration in northern mid-latitude ecosystems.

scholarly journals A new space-borne perspective of crop productivity variations over the US Corn Belt

2020 ◽  
Author(s):  
Peter Somkuti ◽  
Hartmut Boesch ◽  
Robert Parker ◽  
Alex Webb ◽  
Liang Feng ◽  
...  
Keyword(s):  
Time Series ◽  
Land Surface ◽  
Crop Yields ◽  
Pearson Correlation ◽  
Crop Productivity ◽  
Annual Reports ◽  
Corn Belt ◽  
Ir Radiation ◽  
The Us ◽  
New Space

<p>We analyse inter-annual variations of SIF over the US Corn Belt using a seven-year time series (2010–2016) retrieved from measurements of short-wave IR radiation collected by the Japanese Greenhouse gases Observing SATellite (GOSAT). Using survey data and annual reports from the US Department of Agriculture (USDA) National Agricultural Statistics Service (NASS), we relate anomalies in the GOSAT SIF time series to meteorological and climatic events that affected planting or growing seasons. The events described in the USDA annual reports are confirmed using remote sensing-based data such as land surface temperature, precipitation, water storage anomalies and soil moisture. These datasets were carefully collocated with the GOSAT footprints on a sub-pixel basis to remove any effect that could occur due to different sampling. We find that cumulative SIF, integrated from April to June, tracks the planting progress established in the first half of the planting season (Pearson correlation r > 0.89). Similarly, we show that crop yields for corn (maize) and soybeans are equally well correlated to the integrated SIF from July to October (r > 0.86). Our results for SIF are consistent with reflectance-based vegetation indices, that have a longer established history of crop monitoring. Despite GOSAT’s sparse sampling, we were able to show the potential for using satellite-based SIF to study agriculturally-managed vegetation.</p><p>[1] Somkuti et al., "A new space-borne perspective of crop productivity variations over the US Corn Belt." Agricultural and Forest Meteorology 281 (2020): 107826.</p><p> </p>

scholarly journals The extent of soil loss across the US Corn Belt

2021 ◽  
Vol 118 (8) ◽  
pp. e1922375118
Author(s):  
Evan A. Thaler ◽  
Isaac J. Larsen ◽  
Qian Yu
Keyword(s):  
United States ◽  
Soil Erosion ◽  
Soil Loss ◽  
Crop Yields ◽  
Scale Up ◽  
The United States ◽  
Agricultural Landscapes ◽  
Soil Survey ◽  
Economic Losses ◽  
Corn Belt

Soil erosion in agricultural landscapes reduces crop yields, leads to loss of ecosystem services, and influences the global carbon cycle. Despite decades of soil erosion research, the magnitude of historical soil loss remains poorly quantified across large agricultural regions because preagricultural soil data are rare, and it is challenging to extrapolate local-scale erosion observations across time and space. Here we focus on the Corn Belt of the midwestern United States and use a remote-sensing method to map areas in agricultural fields that have no remaining organic carbon-rich A-horizon. We use satellite and LiDAR data to develop a relationship between A-horizon loss and topographic curvature and then use topographic data to scale-up soil loss predictions across 3.9 × 105 km2 of the Corn Belt. Our results indicate that 35 ± 11% of the cultivated area has lost A-horizon soil and that prior estimates of soil degradation from soil survey-based methods have significantly underestimated A-horizon soil loss. Convex hilltops throughout the region are often completely denuded of A-horizon soil. The association between soil loss and convex topography indicates that tillage-induced erosion is an important driver of soil loss, yet tillage erosion is not simulated in models used to assess nationwide soil loss trends in the United States. We estimate that A-horizon loss decreases crop yields by 6 ± 2%, causing $2.8 ± $0.9 billion in annual economic losses. Regionally, we estimate 1.4 ± 0.5 Pg of carbon have been removed from hillslopes by erosion of the A-horizon, much of which likely remains buried in depositional areas within the fields.

scholarly journals Predicting crop yields and soil‐plant nitrogen dynamics in the US Corn Belt

Crop Science ◽  
2020 ◽  
Vol 60 (2) ◽  
pp. 721-738 ◽  
Author(s):  
Sotirios V. Archontoulis ◽  
Michael J. Castellano ◽  
Mark A. Licht ◽  
Virginia Nichols ◽  
Mitch Baum ◽  
...  
Keyword(s):  
Crop Yields ◽  
Nitrogen Dynamics ◽  
Corn Belt ◽  
Plant Nitrogen ◽  
The Us

Penilaian Kinerja Dosen Dengan Menggunakan Metode AHP Studi Kasus di STIE Ahmad Dahlan Jakarta

Liquidity ◽  
2018 ◽  
Vol 2 (1) ◽  
pp. 100-109
Author(s):  
Ellya Sestri
Keyword(s):  
Decision Making ◽  
Performance Appraisal ◽  
Technological Progress ◽  
Pairwise Comparison ◽  
Relative Importance ◽  
Faculty Performance ◽  
Business World ◽  
The Face ◽  
Hierarchy Process ◽  
Rule Out

An increasingly rapid technological progress in the era of globalization in the business world, so do not rule out the possibility that a decision-making is something that is very vital in determining the decisions to be taken in the face of competitive business world. Decision making can be influenced by several aspects, this can affect the speed of decision making by the decision maker in which decisions must be quick and accurate. Lecturer Performance Assessment Using the Analytical Hierarchy Process is a decision support system that aims to assess faculty performance according to certain criteria. This system of faculty performance appraisal criteria to map a hierarchy, where each hierarchy will be performed pairwise comparison, the pairwise comparisons between criteria, so to get a comparison of the relative importance of criteria with each other. The results of this comparison is then analyzed to obtain the priority of each criterion. Once completed and performed an assessment of alternative options to be compared and calculated to obtain the best alternatives according to established criteria.

Justification of the need to increase the fertility of reclaimed alluvial soils of JSC «Moskovskoe»

2020 ◽  
pp. 44-48
Author(s):  
Andrey ilinsky ◽  
Alexander Nefedov ◽  
Konstantin Evsenkin
Keyword(s):  
Organic Matter ◽  
Agricultural Land ◽  
Crop Yields ◽  
Anthropogenic Impacts ◽  
Fertility Restoration ◽  
Research Work ◽  
Alluvial Soils ◽  
Ecological Stability ◽  
Reclaimed Land ◽  
Adverse Weather

Global climatic changes, technogenic pollution by pollutants, violations of technologies of exploitation of reclaimed land lead to a decrease in fertility and soil degradation of agricultural land. Adverse weather conditions, resulting in a lack of adequate flood water, and economic difficulties in agriculture make it difficult to fill the deficit of organic matter and macronutrients in reclaimed alluvial soils. The monitoring of agrochemical properties of alluvial meadow medium-loamy soil of the stationary site (reclaimed lands of JSC «Moskovskoye» of Ryazan region), located in the floodplain of the Oka river, conducted by the Meshchersky branch of Vniigim, showed the presence and intensification of degradation changes in the soil. Thus, comparing the agrochemical indicators in the layer 0–20 cm, carried out in 1995, with the indicators of 2019, it should be noted a decrease in soil fertility. The decrease in soil quality was expressed in a decrease in the amount of mobile phosphorus by 37.6 %, mobile potassium by 53.3 %. Also, during this time there was a decrease in organic matter by 9.1 %, and an increase in soil acidity was 0.6 pH. As a result of such changes, soils lose ecological stability and become more vulnerable to adverse weather and negative anthropogenic impacts. In such a situation, advanced agricultural techniques should be actively used to obtain guaranteed, environmentally safe crop yields and restore the fertility of degraded reclaimed soils. In this regard, there is a need to develop innovative methods of fertility restoration of degraded alluvial soils in reclaimed lands using multi-component organic-mineral ameliorants. Meshchersky branch performs research work in addressing this issue.

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