Development of soil line and vegetative indices using spectroradiometer

Quantification of actual plant consumption of nitrogen (N) is necessary to optimize fertilization efficiency and minimize contamination of earth resources. We examined the performance of fruit-bearing pomegranate trees grown in soilless media and exposed to eight N-fertigation treatments, from 5 to 200 mg N L−1. Reproductive and vegetative indices were found to be optimal when 20 to 70 mg N L−1 was supplied. Nitrogen application levels over 70 mg L−1 reduced pomegranate development and reproduction. N uptake in low-level treatments was almost 100% and decreased gradually, down to 13% in 200 mg N L−1 treatment. N usage efficiency was maximized under 20 mg N L−1, in which case 80% to 90% of added N was taken up by the trees. At high N application, its efficiency was reduced with less than 50% utilized by the trees. Leaf N increased to a plateau as a function of increasing irrigation solution N, maximizing at ~15 to 20 mg N g−1. Therefore, analysis of diagnostic leaves is not a valid method to identify excessive detrimental N. The results should be valuable in the development of efficient, sustainable, environmentally responsible protocols for N fertilization in commercial pomegranate orchards, following adaptation and validation to real soil field conditions.

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Application of the Spectral Neighborhood of Soil Line Technique to Analyze the Intensity of Soil Use in 1985–2014 (by the Example of Three Districts of Tula Oblast)

Eurasian Soil Science ◽

10.1134/s1064229318030110 ◽

2018 ◽

Vol 51 (3) ◽

pp. 345-358 ◽

Cited By ~ 1

Author(s):

D. I. Rukhovich ◽

A. D. Rukhovich ◽

D. D. Rukhovich ◽

M. S. Simakova ◽

A. L. Kulyanitsa ◽

...

Keyword(s):

Soil Line ◽

Spectral Neighborhood

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Optical sensors for variable rate nitrogen application in dairy pastures

Journal of New Zealand Grasslands ◽

10.33584/jnzg.2017.79.533 ◽

2017 ◽

Vol 79 ◽

pp. 223-227

Author(s):

K. Wigley ◽

J.L. Owens ◽

J.A.K. Trethewey ◽

D.C. Ekanayake ◽

R.L. Roten ◽

...

Keyword(s):

Optical Sensors ◽

Vegetation Index ◽

N Uptake ◽

Variable Rate ◽

Water Index ◽

Foliar N ◽

Normalised Difference Vegetation Index ◽

Fertiliser Application ◽

Vegetative Indices ◽

Simple Ratio

Reducing the amount of nitrogen (N) fertiliser applied to dairy pastures down to agronomically optimised levels would have positive economic and environmental results. The ability of commercially available optical sensors to estimate biomass yield and foliar-N uptake in pastures was investigated. Vegetative indices (Simple Ratio, SR; Water Index, WI; and Normalised Difference Vegetation Index, NDVI) from two active optical reflectance sensors (N-Sensor, Yara; and Greenseeker, Trimble) were compared with manually measured biomass and N-uptake in above-ground foliage. There were three measurements over time, from pastures that had received different N fertiliser applications rates (0, 10, 20, 40 and 80 kg N/ha). It was found that the sensors were able to detect differences in biomass and foliar N-uptake following defoliation of grazed pastures. The tested optical sensors have the potential to inform a real-time variable rate fertiliser application system. Keywords: pasture, nitrogen, optical sensors

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Herbicide Concentrations in Honey Mesquite Phloem

Weed Science ◽

10.1017/s0043174500035566 ◽

1972 ◽

Vol 20 (3) ◽

pp. 264-267 ◽

Cited By ~ 11

Author(s):

F. S. Davis ◽

R. E. Meyer ◽

J. R. Baur ◽

R. W. Bovey

Keyword(s):

Acetic Acid ◽

Prosopis Juliflora ◽

High Rate ◽

Soil Line ◽

Herbicide Concentration ◽

Low Rate ◽

Honey Mesquite

Herbicide content in honey mesquite(Prosopis juliflora(Swartz) DC. var.glandulosa(Torr.) Cockerell) phloem 48 hr after treatment was higher in stems within 20 cm of the foliage than in those near the soil line. Similar levels of (2,4,5-trichlorophenoxy)acetic acid (2,4,5-T) occurred from applications of either 0.56 or 1.12 kg/ha, whereas three times as much 4-amino-3,5,6-trichloropicolinic acid (picloram) occurred in plants sprayed with the high rate than in those sprayed with the low rate. Herbicide concentration was highest in June and lowest in August.

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A Methodology for Improving Vegetation Representation and Health Exploiting a Semantic Robotic System and Its Dynamic Stability Control

International Journal of Semantic Computing ◽

10.1142/s1793351x18400020 ◽

2018 ◽

Vol 12 (01) ◽

pp. 25-41

Author(s):

Daniela D’Auria ◽

Fabio Persia

Keyword(s):

Dynamic Stability ◽

Production Cost ◽

Semantic Information ◽

Agricultural Productivity ◽

Precision Farming ◽

Stability Control ◽

Robotic System ◽

The Real ◽

Vegetative Indices ◽

Dynamic Stability Control

Precision farming technologies have been increasingly recognized for their potential ability for improving agricultural productivity, reducing production cost, and minimizing damage to the environment. In this context, the main goals of this paper are the following: First, we present a methodology that can be applied to extract semantic information, more specifically some vegetative indices, from plants, in order to further improve the vegetation representation and health by means of a specific semantic robotic system; then, we study in detail the tracked robot’s behavior, by emulating the real settings in a field and analytically analyze the simulation of the robot on an up and down slope path.

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Stochastic and chaotic analysis of the psycho-emotional status and vegetative indices in the complex treatment of chronic muscle-skeletal pains

Journal of New Medical Technologies ◽

10.12737/article_59c49e6558f164.61711475 ◽

2017 ◽

pp. 1-1 ◽

Cited By ~ 1

Author(s):

А. Томчук ◽

A. Tomchuk ◽

В. Широков ◽

V. Shirokov ◽

И. Мирошниченко ◽

...

Keyword(s):

Complex Treatment ◽

Emotional Status ◽

Vegetative Indices

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Stem Blight of Eustoma grandiflorum Caused by Sclerotium rolfsii in Florida

Plant Health Progress ◽

10.1094/php-2000-0606-01-hn ◽

2000 ◽

Vol 1 (1) ◽

pp. 29

Author(s):

R. J. McGovern ◽

H. Bouzar ◽

B. K. Harbaugh

Keyword(s):

Sclerotium Rolfsii ◽

Eustoma Grandiflorum ◽

Disease Symptoms ◽

Central Florida ◽

Stem Blight ◽

Soil Line ◽

West Central ◽

Stem Necrosis

During a 4-week period in May through June 1996, 15% of 50 mature lisianthus (Eustoma grandiflorum) ‘Maurine Blue’ and ‘Maurine White’ plants exhibited stem blight in a landscape planting in west-central Florida. Initial disease symptoms included stem necrosis at the soil line, and yellowing and tan discoloration of leaves. As blighting of the stem progressed, infected plants wilted and died. Posted 6 June 2000.

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