scholarly journals 565 Use of Cooperative Learning Exercizes to Introduce Concepts in Potted Plant Production Classes

HortScience ◽  
2000 ◽  
Vol 35 (3) ◽  
pp. 493C-493
Author(s):  
Neil O. Anderson

In production classes, students often commence the class by learning complicated crop-specific production cycles. Rarely are they afforded the opportunity of spending several class periods to first understand the major differences between commercial crops for production time, labor input, and market share. A cooperative learning exercise was created for the first week of lectures in potted plant production class (Hort 4051) at the Univ. of Minnesota (n = 18 students). Students were assigned to working groups for discussion and synthesis of the assignment. One week later, each group turned in their recommendations and one lecture session was devoted to in-class discussion of their answers. The exercise was in the form of a memo from a commercial company, Floratech, addressed to the students as the newly hired potted plant production specialists. In the memo, a graphical summary was presented of 13 major and minor potted crops, contrasting total production time, labor input, and market share for each crop. As production specialists, the student's primary task was to interact with all staff (other students role-playing various positions within the company) to answer the following question: “What is the most realistic, cost-effective location on the graph that Floratech should aim to move all crops?” Group discussions, both within and outside of class, focused on the noticeable trends depicted by the graph and the limiting factors that prevented crops from moving to the ideal location. Growers and breeders were quizzed on what factors kept each crop in the specific locations on the graph. The majority of student chose the midpoint of the graph as the best location. The exercise successfully peaked student's awareness of crop differences and the limiting production factors. Throughout the semester, students referred back to this graph to pinpoint the location for each crop covered.

Author(s):  
Made Agus Putra Subali ◽  
I Gusti Rai Agung Sugiartha ◽  
Arya Faisal Akbar

The partner in this program is the home industry of “basa” crackers or seasoning crackers. There are several partner problems, 1) Long production time, 2) Simple and conventional product packaging, 3) Profit sharing from product marketing. The solutions to overcome these problems are, 1) Providing production equipment, 2) Installing packaging label, 3) Promotion through facebook. The results are, 1) The partner is able to accelerate and increase production quantity where in single production, the partner can produce more than 105 packs of basa crackers. 2) Product quality is better with packaging label. 3) Promotion through facebook can expand market share.


1997 ◽  
Vol 48 (1) ◽  
pp. 63-72 ◽  
Author(s):  
Chung Yaw Ching ◽  
Ching-Jong Liao ◽  
Chutao John Wu

Author(s):  
Amit Maha ◽  
Vamsidhar Palaparthy ◽  
Steven A. Soper ◽  
Michael C. Murphy ◽  
Dimitris E. Nikitopoulos

This part of our work has been aimed at designing, manufacturing and characterizing effective micro-mixers which are cheap, durable and easily integrated on a variety of bio-chips with emphasis on those performing Polymerese Chain Reactions (PCR) and Ligase Detection Reactions (LDR). A key contribution is the development of an optimization procedure for the design of passive micro-mixers utilizing high-aspect-ratio micro-channels (HARMC). The optimization procedure identifies the optimum type of mixer on the basis of the flow rate proportions of the mixture constituents and provides for two optimum designs of the selected mixer type for an aspect ratio of choice in two ways: (a) for specified mixture volume and mixer pressure drop the optimum mixer dimensions and operating condition minimize the total production time and (b) for specified mixture volume and a total production time the optimum mixer dimensions and operating condition minimize the mixer pressure drop. The simplest and easiest to manufacture layout of an optimized mixer configuration (X2JC) with two inlet ports and three layers is shown in Figure 1. The injection of compound 1 into the compound 2 main stream is performed through two side-jets in a wider channel to further reduce the pressure loss overhead followed by a contraction into the main mixing channel.


Author(s):  
John Fawsitt

Reading and literature are struggling for relevance an environment where attention and the data they provide are seen as key motivators for commercial actors, and there is great pressure for those actors to provide engaging media to secure a meaningful market share. Thus, this media has to attract and keep user attention as quickly and as continuously as possible. The only limiting factors being those of time and energy of the user. Leisure hours that allowed periods for unbroken concentration and perusal of written texts are now devoted to online activities. What is not debated is that the effort and focus required to engage with the writer of fiction or other longer texts cannot be as automatically assumed now as it was before the digital age. Therefore, how can or should reading and literature and our notion of them and their purposes change?


1997 ◽  
Vol 18 (1) ◽  
pp. 20-27 ◽  
Author(s):  
Patricia G. Mathes ◽  
Douglas Fuchs ◽  
Lynn S. Fuchs

There is broad consensus that the ultimate goal of all reading instruction is to produce competent readers who comprehend what they read. This article describes one technique designed to promote greater reading comprehension development in students at various points along the reading achievement continuum. We call this technique cooperative story mapping. Cooperative story mapping combines the use of a story grammar strategy with cooperative learning procedures to create an activity in which all students are actively engaged in analyzing and discussing stories. Cooperative story mapping encourages students to interact with each other to share and extend their understanding of narrative text. This interaction is then expanded through whole class discussion. The result, we believe, is greater overall comprehension development.


2021 ◽  
Vol 117 (2) ◽  
pp. 1
Author(s):  
Zhaleh SOHEILIKHAH ◽  
Nasser KARIMI ◽  
Masoud MODARRESI ◽  
Seyed Yahya SALEHI-LISAR ◽  
Ali MOVAFEGHI

Salt stress is one of the major limiting factors for plant production, and the quality of medicinal plants is also affected by soil salinity. Hyssop (Hyssopus officinalis L.) plants were cultivated for four weeks in perlite: sand and irrigated with Hoagland nutrient solution containing 0, 50, 100, 150, and 200 mM NaCl. Plants growth was decreased by salt stress while the leaf relative water content was not affected, and the chlorophyll content decreased only by the highest salt concentration (200 mM). Sodium was accumulated at small amounts, indicating a high ability of this species to exclude salt. Soluble sugars and proline were accumulated up to 1.6 and 4.5 fold, respectively. The antioxidant enzymes activity (peroxidase, catalase, ascorbate peroxidase) were increased by the salt treatments, particularly in the leaves. The levels of secondary metabolites (saponins, phenolics, flavonoids, anthocyanins, and iridoids) were all increased under salt stress, and the total antioxidant capacity of alcoholic extract of the leaves and roots was significantly higher in the salt-treated compared with control plants. Our results showed that hyssop is a salt-tolerant species, and the quality of this medicinal plant is improved when grown under saline conditions.


HortScience ◽  
1992 ◽  
Vol 27 (6) ◽  
pp. 575e-575
Author(s):  
J.T. Lehmann ◽  
M.L. Albrecht

Armeria maritima was studied to provide guidelines for flowering potted plant production. Seed and vegetatively propagated plants were exposed to 9-hr, 13-hr, or 17-hr photoperiods. Flowering was enhanced under the 13-hr and 17-hr photoperiods. Peduncle and leaf length were shorter, and plants were more compact under short days (SD, 9-hr photoperiod) than under long days (LD). When grown under SDs then moved at monthly intervals to LDs, the degree to which the compact growth habit (CH) was expressed was dependent upon the length of exposure to SDs. Plants with the CH produced fewer inflorescences than full growth habit plants. Plants held in cold storage (4C) flowered more profusely under LDs, but had a delay in flowering. There was more uniform flowering for plants held in cold storage than those held in a cool greenhouse (7C night temperature).


2020 ◽  
Author(s):  
Mostapha El Jai ◽  
Iatimad AKHRIF ◽  
Nourddin Saidou

Abstract In this paper, the authors propose a novel strategy of 2D scanning that might be adapted for any additive manufacturing process. The featured novelty corresponds to a Skeleton Based Perpendicularly (SBP) of the 2D shape of each slice. Thus, it is proposed to minimize the total production time of a given layer under some constraints. In other word, it is proposed to study the competitiveness conditions of the new scanning technique regarding the classical chess scanning strategy from a productivity perspective. In order to introduce this new technique, the paper treats the case of a rectangular layer. The competitiveness of the proposed technique was discussed according to chess decomposition parameters, the hatch space distance, and the dimensions of the primitive rectangle layer to analyze. The indicators introduced corresponds to “the gain of production time” and “the specific gain of production time per surface unit”; then, these latter were computed and discussed in two separated cases of study. The findings show that, by the adoption of the SBP technique instead the chess scanning strategy, it is possible to save about 3% to 45% of production time gain for the first case of study. The gain of production time per surface unit was analyzed in the second case of study. The correspondent analysis permitted to highlight the percentage of gain of time related to the area to scan. Indeed, the gain per surface unit varies between 4.32×10-6%/mm2 and 6.96×10-05%/mm2. In one hand, these indicators depend linearly on the decomposition strategy of the central area of the SBP technique and also according to the rectangle dimensions. In addition, for the lowest values of hatch space, around 25µm, the two techniques in competition present quasi-similar production time, where the variations between them is minimal. Nevertheless, starting from 65µm, the SBP scanning strategy present considerable less time of production judged as exponentially decreasing according to the hatch space distance. Finally, one can see that the scanning model proposed could present major contributions in other scientific and technical fields that use surface control as territorial security, water adduction and distribution, telecommunication, etc. by varying and adapting the decision variables according to each field of study.


2001 ◽  
Vol 11 (3) ◽  
pp. 481-484 ◽  
Author(s):  
Neil O. Anderson

A case study is presented for use as an active learning tool for students in a floriculture potted plant production class. This is the second case study developed for Floratech, a potted plant finisher. Students work together in small groups to solve the proposed problems; each student role-plays as a Potted Plant Production Specialist. A memorandum from the Board of Directors is delivered in their first month on the job at Floratech. Objectives of this case study are to determine the students' fluency in terminology and crop-specific cultural requirements for potted plant production of cyclamen (Cyclamen persicum) and primrose (Primula sp.) as well as their ability to setup a scientifically rigorous and unbiased cultivar trial for Floratech personnel and selected customers. Students research the latest commercial catalogs to determine which species, series, and cultivars are available, as well as their relative merits, prior to choosing the appropriate cultivars to include in the trial. The trial setup has a space limitation of 2,000 ft2 (186 m2). This case study was tested with 20 undergraduate students during Fall Semester 1999. The case study demonstrated the students' fluency with terminology and crop-specific cultural requirements for both crops. Their ability to set up a scientifically rigorous trial varied widely, often with an inadequate sampling of cultivars and excessive replications (56 ± 37 cyclamen to 132 ± 65 primrose). A mean ± sd of 4 ± 1 cyclamen and 7 ± 3 primrose series were chosen. The number of cultivars varied from 6 ± 2 cyclamen to 9 ± 4 primrose and the number of distributors was similar for the crops. Trial design and additional questions raised by the case study were discussed in class and applied in a cultivar trial in the lab. Unanswered questions were used as learning opportunities during class tours with local growers.


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