EFFICIENCY OF PRE-PLANT, TOPDRESS, AND VARIABLE RATE APPLICATION OF NITROGEN IN WINTER WHEAT

2012 ◽  
Vol 35 (12) ◽  
pp. 1776-1790 ◽  
Author(s):  
Christopher N. Boyer ◽  
B. Wade Brorsen ◽  
William R. Raun ◽  
D. Brian Arnall ◽  
John B. Solie
Keyword(s):  
Winter Wheat ◽  
Variable Rate ◽  
Variable Rate Application

Soil test phosphorus crop response projections to variable rate application in winter wheat

1998 ◽  
Vol 29 (11-14) ◽  
pp. 1731-1738 ◽  
Author(s):  
Michael W. Goedeken ◽  
Gordon V. Johnson ◽  
William R. Raun ◽  
Steven B. Phillips
Keyword(s):  
Winter Wheat ◽  
Soil Test ◽  
Variable Rate ◽  
Crop Response ◽  
Variable Rate Application ◽  
Soil Test Phosphorus

Evaluation of Centrifugal Spreader Response to Variable Rate Application by Using Task File Data

2020 ◽  
Vol 53 (2) ◽  
pp. 15804-15809
Author(s):  
Galibjon M. Sharipov ◽  
Andreas Heiß ◽  
Hans W. Griepentrog ◽  
Dimitrios S. Paraforos
Keyword(s):  
Variable Rate ◽  
Variable Rate Application

The sensitivity of economic gains from high-speed planting

2017 ◽  
Vol 8 (2) ◽  
pp. 662-667
Author(s):  
C. R. Dillon ◽  
J. Shockley ◽  
T. Mark
Keyword(s):  
Optimization Model ◽  
Technological Progress ◽  
High Speed ◽  
Operating Cost ◽  
Cost Savings ◽  
Variable Rate ◽  
Net Returns ◽  
Variable Rate Application ◽  
Technology Changes ◽  
Profit Potential

Recent technological progress in high-speed planting (HSP) warrants economic analysis of its potential. A whole farm optimization model of a 1000 ha Kentucky, USA corn and soybean operation finds that operating cost savings (labor, fuel, tractor repairs) and yield increases couple in recovering annual ownership costs of HSP technology. Changes in farm net returns are positive for all 12-row planter scenarios and all double speed cases for the 16-row planter but not for a 50% increase in speed with the 16-row planter. The greatest profit potential occurred when adopting the combination of HSP and variable rate application (VRA), with increased net returns of up to 6.57% compared to conventional speed no VRA for the 12-row planter.

Variable-rate application technologies in precision agriculture

2018 ◽  
pp. 171-193
Author(s):  
Kenneth A. Sudduth ◽  
◽  
Aaron J. Franzen ◽  
Heping Zhu ◽  
Scott T. Drummond ◽  
...  
Keyword(s):  
Precision Agriculture ◽  
Variable Rate ◽  
Variable Rate Application

scholarly journals On-Farm Evaluation of Prescription Map-Based Variable Rate Application of Pesticides in Vineyards

Agronomy ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 102 ◽  
Author(s):  
Javier Campos ◽  
Montserrat Gallart ◽  
Jordi Llop ◽  
Paula Ortega ◽  
Ramón Salcedo ◽  
...  
Keyword(s):  
Plant Protection ◽  
Design Procedure ◽  
Plant Protection Products ◽  
Application Rate ◽  
Variable Rate ◽  
Variable Rate Application ◽  
Pesticide Distribution ◽  
Spray Distribution ◽  
Disease Damage ◽  
High Degree

Canopy characteristics are crucial for accurately and safely determining the pesticide quantity and volume of water used for spray applications in vineyards. The inevitably high degree of intraplot variability makes it difficult to develop a global solution for the optimal volume application rate. Here, the design procedure of, and the results obtained from, a variable rate application (VRA) sprayer are presented. Prescription maps were generated after detailed canopy characterization, using a multispectral camera embedded on an unmanned aerial vehicle, throughout the entire growing season in Torrelavit (Barcelona) in four vineyard plots of Chardonnay (2.35 ha), Merlot (2.97 ha), and Cabernet Sauvignonn (4.67 ha). The maps were obtained by merging multispectral images with information provided by DOSAVIÑA®, a decision support system, to determine the optimal volume rate. They were then uploaded to the VRA prototype, obtaining actual variable application maps after the application processes were complete. The prototype had an adequate spray distribution quality, with coverage values in the range of 20–40% and exhibited similar results in terms of biological efficacy on powdery mildew compared to conventional (and constant) application volumes. The VRA results demonstrated an accurate and reasonable pesticide distribution, with potential for reduced disease damage even in cases with reduced amounts of plant protection products and water.

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