Citrus Under Protective Screen (CUPS) production systems

Nonchemical methods including host resistance, organic amendments, crop rotation, soil solarization, and cultural practices have been used to control soilborne pests in fresh market vegetable production systems. Their suitability as alternatives to methyl bromide will depend on the approach to pest management used by the grower. Traditionally, methyl bromide is used in production systems that rely on the single application of a broad-spectrum biocide to disinfest soils prior to planting. Non-chemical methods are not suitable for a single tactic approach to pest management because they do not provide the same broad spectrum of activity or consistency as fumigation with methyl bromide. Nonchemical methods are compatible with an integrated pest management (IPM) approach, where multiple tactics are used to maintain damage from pests below an economic threshold while minimizing the impact to beneficial organisms. However, adoption of IPM is hindered by the paucity of economically feasible sampling programs and thresholds for soilborne pests and by a reluctance of growers to commit additional resources to the collection and management of biological information. A novel approach to the management of soilborne pests is to design the crop production system to avoid pest outbreaks. Using this “proactive” approach, a tomato production system was developed using strip-tillage into existing bahia-grass pasture. By minimizing inputs and disruption to the pasture, growers were able to reap the rotational benefits of bahiagrass without cultivating the rotational crop. While minimizing the need for interventive procedures, a proactive approach is difficult to integrate into existing crop production systems and will require several years of testing and validation.

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Soil Bacterial Community Diversity and Composition as Affected by Tillage Intensity Treatments in Corn-Soybean Production Systems

Microbiology Research ◽

10.3390/microbiolres12010012 ◽

2021 ◽

Vol 12 (1) ◽

pp. 157-172

Author(s):

Shankar G. Shanmugam ◽

Normie W. Buehring ◽

Jon D. Prevost ◽

William L. Kingery

Keyword(s):

Microbial Community ◽

Bacterial Community ◽

Community Composition ◽

Production System ◽

Soil Microbial Community ◽

Production Systems ◽

Bacterial Community Composition ◽

Soybean Production ◽

Soil Microbial ◽

Soil Bacterial

Our understanding on the effects of tillage intensity on the soil microbial community structure and composition in crop production systems are limited. This study evaluated the soil microbial community composition and diversity under different tillage management systems in an effort to identify management practices that effectively support sustainable agriculture. We report results from a three-year study to determine the effects on changes in soil microbial diversity and composition from four tillage intensity treatments and two residue management treatments in a corn-soybean production system using Illumina high-throughput sequencing of 16S rRNA genes. Soil samples were collected from tillage treatments at locations in the Southern Coastal Plain (Verona, Mississippi, USA) and Southern Mississippi River Alluvium (Stoneville, Mississippi, USA) for soil analysis and bacterial community characterization. Our results indicated that different tillage intensity treatments differentially changed the relative abundances of bacterial phyla. The Mantel test of correlations indicated that differences among bacterial community composition were significantly influenced by tillage regime (rM = 0.39, p ≤ 0.0001). Simpson’s reciprocal diversity index indicated greater bacterial diversity with reduction in tillage intensity for each year and study location. For both study sites, differences in tillage intensity had significant influence on the abundance of Proteobacteria. The shift in the soil bacterial community composition under different tillage systems was strongly correlated to changes in labile carbon pool in the system and how it affected the microbial metabolism. This study indicates that soil management through tillage intensity regime had a profound influence on diversity and composition of soil bacterial communities in a corn-soybean production system.

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A New Procedure of Production Orders Sequencing in Mixed-Model Production Systems

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1036.864 ◽

2014 ◽

Vol 1036 ◽

pp. 864-868 ◽

Cited By ~ 1

Author(s):

Marcin Zemczak ◽

Damian Krenczyk

Keyword(s):

Task Scheduling ◽

Production System ◽

Mixed Model ◽

Production Systems ◽

Production Capacity ◽

Approximate Solutions ◽

Task Sequence ◽

Optimal Method ◽

Sequencing Problem ◽

Car Sequencing

The paper presents the task scheduling issue, which main aim is to establish a proper sequence of tasks, that would maximize the utilization of companys production capacity. According to the literature sources, the presented sequencing problem, denoted as CSP (Car Sequencing Problem) belongs to the NP-hard class, as has been proven by simple reduction from Hamiltonians Path problem. Optimal method of solution has not yet been found, only approximate solutions have been offered, especially from the range of evolutionary algorithms. Regardless of specific production system, while considering reception of new tasks into the system, current review of the state of the system is required in order to decide whether and when a new order can be accepted for execution. In this paper, the problem of task scheduling is limited to the specific existing mixed-model production system. The main goal is to determine the effective method of creation of task sequence. Through the use of computational algorithms, and automatic analysis of the resulting sequence, rates of production are able to be checked in a real time, and so improvements can be proposed and implemented.

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Using Computer Simulation Method to Improve Throughput of Production Systems by Buffers and Workers Allocation

Management and Production Engineering Review ◽

10.1515/mper-2015-0037 ◽

2015 ◽

Vol 6 (4) ◽

pp. 60-69 ◽

Cited By ~ 2

Author(s):

Sławomir Kłos ◽

Peter Trebuna

Keyword(s):

Computer Simulation ◽

Production System ◽

Production Systems ◽

Simulation Method ◽

System Throughput ◽

Buffer Allocation ◽

Simulation Experiments ◽

Buffer Capacities ◽

The Relationship ◽

Support Decision Making

Abstract This paper proposes the application of computer simulation methods to support decision making regarding intermediate buffer allocations in a series-parallel production line. The simulation model of the production system is based on a real example of a manufacturing company working in the automotive industry. Simulation experiments were conducted for different allocations of buffer capacities and different numbers of employees. The production system consists of three technological operations with intermediate buffers between each operation. The technological operations are carried out using machines and every machine can be operated by one worker. Multi-work in the production system is available (one operator operates several machines). On the basis of the simulation experiments, the relationship between system throughput, buffer allocation and the number of employees is analyzed. Increasing the buffer capacity results in an increase in the average product lifespan. Therefore, in the article a new index is proposed that includes the throughput of the manufacturing system and product life span. Simulation experiments were performed for different configurations of technological operations.

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Responsive Production Systems and Roles that Robots can Play

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.62-64.275 ◽

2009 ◽

Vol 62-64 ◽

pp. 275-292

Author(s):

R.H. Weston

Keyword(s):

Building Block ◽

Production System ◽

World Wide ◽

Production Systems ◽

Industrial Robots ◽

Robotic Systems ◽

Different Types ◽

Useful Lifetime

With increased product dynamics world-wide, the average economic lifetime of production systems is falling. Industrial robots are widely assumed to be inherently flexible and therefore that they can function as a programmable building block of response production systems. This paper reviews common capabilities of contemporary industrial robotic systems and investigates their capability to extend the useful lifetime of production system by coping with different types of product dynamic. Also considered are relative capabilities of conventional programmable robots and an emerging generation of programmable and configurable component-based machines.

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System dynamics modelling of fixed and dynamic Kanban controlled production systems: a supply chain perspective

Journal of Modelling in Management ◽

10.1108/jm2-06-2020-0168 ◽

2021 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

Jagan Mohan Reddy K. ◽

Neelakanteswara Rao A. ◽

Krishnanand Lanka ◽

PRC Gopal

Keyword(s):

Supply Chain ◽

System Dynamics ◽

Cycle Time ◽

Production System ◽

Demand Uncertainty ◽

Production Systems ◽

Decision Variable ◽

Content Type ◽

Pull Production ◽

Kanban System

Purpose Pull production systems have received much attention in the supply chain management environment. The number of Kanbans is a key decision variable in the pull production system as it affects the finished goods inventory (FGI) and backorders of the system. The purpose of this study is to compare the performance of the fixed and dynamic Kanban systems in terms of operational metrics (FGI and backorders) under the demand uncertainty. Design/methodology/approach In this paper, the system dynamics (SD) approach was used to model the performance of fixed and dynamic Kanban based production systems. SD approach has enabled the feedback mechanism and is an appropriate tool to incorporate the dynamic control during the simulation. Initially, a simple Kanban based production system was developed and then compared the performance of production systems with fixed and dynamic controlled Kanbans at the various demand scenarios. Findings From the present study, it is observed that the dynamic Kanban system has advantages over the fixed Kanban system and also observed that the variation in the backorders with respect to the demand uncertainty under the dynamic Kanban system is negligible. Research limitations/implications In a just-in-time production system, the number of Kanbans is a key decision variable. The number of Kanbans is mainly depended on the demand, cycle time, safety stock factor (SSF) and container size. However, this study considered only demand uncertainty to compare the fixed and dynamic Kanban systems. This paper further recommends researchers to consider other control variables which may influence the number of Kanbans such as cycle time, SSF and container size. Originality/value This study will be useful to decision-makers and production managers in the selection of the Kanban systems in uncertain demand applications.

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RARE EARTH ELEMENTS IN CITRUS PRODUCTION SYSTEMS

Journal of Plant Nutrition ◽

10.1080/01904167.2012.754040 ◽

2013 ◽

Vol 36 (5) ◽

pp. 762-771 ◽

Cited By ~ 14

Author(s):

Christian Turra ◽

Elisabete A. De Nadai Fernandes ◽

Márcio Arruda Bacchi ◽

Gabriel Adrián Sarriés ◽

Fernando Barbosa Júnior ◽

...

Keyword(s):

Rare Earth ◽

Rare Earth Elements ◽

Production Systems ◽

Citrus Production

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Surface lime and silicate application and crop production system effects on physical characteristics of a Brazilian Oxisol

Soil Research ◽

10.1071/sr16247 ◽

2017 ◽

Vol 55 (8) ◽

pp. 778

Author(s):

G. S. A. Castro ◽

C. A. C. Crusciol ◽

C. A. Rosolem ◽

J. C. Calonego ◽

K. R. Brye

Keyword(s):

Physical Properties ◽

Bulk Density ◽

Production System ◽

Crop Production ◽

Management Practices ◽

Production Systems ◽

Crop Productivity ◽

Soil Physical Properties ◽

Physical Characteristics ◽

Forage Crop

This work aimed to evaluate the effects of crop rotations and soil acidity amelioration on soil physical properties of an Oxisol (Rhodic Ferralsol or Red Ferrosol in the Australian Soil Classification) from October 2006 to September 2011 in Botucatu, SP, Brazil. Treatments consisted of four soybean (Glycine max)–maize (Zea mays)–rice (Oryza sativa) rotations that differed in their off-season crop, either a signal grass (Urochloa ruziziensis) forage crop, a second crop, a cover crop, or fallow. Two acid-neutralising materials, dolomitic lime (effective calcium carbonate equivalent (ECCE) = 90%) and calcium-magnesium silicate (ECCE = 80%), were surface applied to raise the soil’s base saturation to 70%. Selected soil physical characteristics were evaluated at three depths (0–0.1, 0.1–0.2, and 0.2–0.4 m). In the top 0.1 m, soil bulk density was lowest (P < 0.05) and macroporosity and aggregate stability index were greatest (P < 0.05) in the forage crop compared with all other production systems. Also, bulk density was lower (P < 0.05) and macroporosity was greater (P < 0.05) in the acid-neutralising-amended than the unamended control soil. In the 0.1–0.2-m interval, mean weight diameter and mean geometric diameter were greater (P < 0.05) in the forage crop compared with all other production systems. All soil properties evaluated in this study in the 0.2–0.4-m interval were unaffected by production system or soil amendment after five complete cropping cycles. Results of this study demonstrated that certain soil physical properties can be improved in a no-tillage soybean–maize–rice rotation using a forage crop in the off-season and with the addition of acid-neutralising soil amendments. Any soil and crop management practices that improve soil physical properties will likely contribute to sustaining long-term soil and crop productivity in areas with highly weathered, organic matter-depleted, acidic Oxisols.

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