VARIABLE RATE NITROGEN APPLICATION IN FLORIDA CITRUS BASED ON ULTRASONICALLY-SENSED TREE SIZE

2005 ◽  
Vol 21 (3) ◽  
pp. 331-335 ◽  
Author(s):  
Q. U. Zaman ◽  
A. W. Schumann ◽  
W. M. Miller
Keyword(s):  
Tree Size ◽  
Variable Rate ◽  
Nitrogen Application ◽  
Florida Citrus

Effects of Variable Rate Nitrogen Application on cv. Barbera Performance: Vegetative Growth and Leaf Nutritional Status

2018 ◽  
Vol 69 (3) ◽  
pp. 196-209 ◽  
Author(s):  
Matteo Gatti ◽  
Cecilia Squeri ◽  
Alessandra Garavani ◽  
Alberto Vercesi ◽  
Paolo Dosso ◽  
...  
Keyword(s):  
Nutritional Status ◽  
Vegetative Growth ◽  
Variable Rate ◽  
Nitrogen Application ◽  
Cv Barbera

Variable Rate Liquid Nitrogen Application for Cotton and Corn Production

2001 ◽  
Author(s):  
C. G. Bowers ◽  
G. T. Roberson ◽  
D. K. Cassel ◽  
G. C. Naderman ◽  
Cavell Brownie
Keyword(s):  
Liquid Nitrogen ◽  
Variable Rate ◽  
Nitrogen Application ◽  
Corn Production

scholarly journals Economic Comparison of Satellite, Plane and UAV-Acquired NDVI Images for Site-Specific Nitrogen Application: Observations from Italy

Agronomy ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2098
Author(s):  
Marco Sozzi ◽  
Ahmed Kayad ◽  
Stefano Gobbo ◽  
Alessia Cogato ◽  
Luigi Sartori ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Decision Making ◽  
Optical Properties ◽  
High Resolution ◽  
Economic Benefits ◽  
Decision Making Process ◽  
Variable Rate ◽  
Nitrogen Application ◽  
Sensing Platforms ◽  
Medium Resolution

Defining the most profitable remote sensing platforms is a difficult decision-making process, as it requires agronomic and economic considerations. In this paper, the price and profitability of three levels of remote sensing platforms were evaluated to define a decision-making process. Prices of satellite, plane and UAV-acquired vegetation indices were collected in Italy during 2020 and compared to the economic benefits resulting from variable rate nitrogen application, according to a bibliographic meta-analysis performed on grains. The quality comparison of these three technologies was performed considering the error propagation in the NDVI formula. The errors of the single bands were used to assess the optical properties of the sensors. Results showed that medium-resolution satellite data with good optical properties could be profitably used for variable rate nitrogen applications starting from 2.5 hectares, in case of medium resolution with good optical properties. High-resolution satellites with lower optical quality were profitable starting from 13.2 hectares, while very high-resolution satellites with good optical properties could be profitably used starting from 76.8 hectares. Plane-acquired images, which have good optical properties, were profitable starting from 66.4 hectares. Additionally, a reference model for satellite image price is proposed.

scholarly journals Estimation of maize yield and effects of variable-rate nitrogen application using UAV-based RGB imagery

2020 ◽  
Vol 189 ◽  
pp. 24-35 ◽  
Author(s):  
Meina Zhang ◽  
Jianfeng Zhou ◽  
Kenneth A. Sudduth ◽  
Newell R. Kitchen
Keyword(s):  
Maize Yield ◽  
Variable Rate ◽  
Nitrogen Application

Effects of Variable Rate Nitrogen Application on cv. Barbera Performance: Yield and Grape Composition

2019 ◽  
Vol 70 (2) ◽  
pp. 188-200 ◽  
Author(s):  
Matteo Gatti ◽  
Cecilia Squeri ◽  
Alessandra Garavani ◽  
Tommaso Frioni ◽  
Paolo Dosso ◽  
...  
Keyword(s):  
Variable Rate ◽  
Nitrogen Application ◽  
Cv Barbera

Capability of crop canopy sensing to predict crop parameters of cut grass swards aiming at early season variable rate nitrogen top dressings

2017 ◽  
Vol 8 (2) ◽  
pp. 792-795 ◽  
Author(s):  
G. Portz ◽  
M. L. Gnyp ◽  
J. Jasper
Keyword(s):  
Cross Validation ◽  
N Uptake ◽  
Calibration Data ◽  
Variable Rate ◽  
Nitrogen Application ◽  
Crop Canopy ◽  
Validation Data ◽  
Intensively Managed ◽  
Independent Calibration ◽  
Crop Parameters

This study aims to evaluate actual biomass and N-uptake estimates with the Yara N-Sensor in intensively managed grass swards across several trial sites in Europe. The dataset was split by location into an independent calibration data (UK and Finland) and a validation data (Germany) for the first two cuts. Yara N-Sensor readings were better correlated with N-uptake (R2=0.71) than actual biomass (R2=0.53) for the 1st cut. At the 2nd cut, the R2 values for both parameters were higher (0.80 and 0.56). A cross-validation with a German grass trial indicated the potential for predicting N-uptake (R2>0.8). It can be concluded that the technology has the potential to guide management decisions and variable rate nitrogen application on European grass swards.

Economic Feasibility of Variable-Rate Nitrogen Application Utilizing Site-Specific Management Zones

2004 ◽  
Vol 96 (6) ◽  
pp. 1572-1580 ◽  
Author(s):  
B. Koch ◽  
R. Khosla ◽  
W. M. Frasier ◽  
D. G. Westfall ◽  
D. Inman
Keyword(s):  
Economic Feasibility ◽  
Variable Rate ◽  
Nitrogen Application ◽  
Site Specific ◽  
Management Zones ◽  
Specific Management

A simulation of variable rate nitrogen application in winter wheat with soil and sensor information - An economic feasibility study

2021 ◽  
Vol 192 ◽  
pp. 103147
Author(s):  
Michael Friis Pedersen ◽  
Jacob Glerup Gyldengren ◽  
Søren Marcus Pedersen ◽  
Efstathios Diamantopoulos ◽  
René Gislum ◽  
...  
Keyword(s):  
Winter Wheat ◽  
Feasibility Study ◽  
Economic Feasibility ◽  
Variable Rate ◽  
Nitrogen Application ◽  
Sensor Information
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