• Title/Summary/Keyword: rectangular plot

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Comparative Study on Working Time under Various Plot Sizes and Plot Shapes (표본점(標本點)의 크기와 형태에 따른 작업시간(作業時間)의 비교연구(比較硏究))

  • Byun, Woo Hyuk;Yoo, Jae Woong
    • Journal of Korean Society of Forest Science
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    • v.77 no.4
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    • pp.421-428
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    • 1988
  • The purpose of this study was to analyze the working time and the efficiency according to plot shape and plot size under the same conditions. We chose two stands which were relatively gently sloped end evenly distributed in number of trees and surveyed 198 plots, and 306 plots in each stand. 1. As to the time advantage of plot establishment method, the direct-four line establishment method was more favorable than the diagonal-line establishment method in a rectangular plot. 2. The method by Blumeleiss-$Me{\beta}$ trommel was more favorable than the method using a tape in a circular plot. 3. As to the time advantage, the circular plot was more favorable than the rectangular plot. Especially, the circular plot was twice more available than rectangular plot in small plot size, but enlargement of plot size gradually decreased time advantage of circular plot.

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On the sampling unit (표본점단위(標本點單位)에 대(對)하여)

  • Kim, Kap Duk
    • Journal of Korean Society of Forest Science
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    • v.4 no.1
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    • pp.26-29
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    • 1965
  • 1. The purpose of this study was to find out the best sampling form and sampling unit in forest survey. 2. The value of small sampling unit was over estimated in comparison with that of large sampling unit. 3. The value of circular form was over estimated in comparison with that of the others. 4. The smallest unit for estimation in area sampling were as follows. a) 0.06 ha. in the rectangular plot. b) 0.08 ha. in the square plot. c) 0.10 ha. in the circular plot. 5. Conclusion was as follows. The best sampling unit was 0.06 hectoare in the rectangular plot, which was most economic above all and gave preferable result for in the forest survey.

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Effect of Plant Density and Planting Pattern on the Growth Chracteristics , Dry matter Yield and Feeding Value of Sorghum -Sudangrass Hybrid (파종량과 재식양식이 수수-수단그라스계 잡종의 생육특성 , 건물수량 및 사료가치에 미치는 영향)

  • 전병태;이상무;신동은;문상호;김운식
    • Journal of The Korean Society of Grassland and Forage Science
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    • v.12 no.1
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    • pp.49-58
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    • 1992
  • The purpose of the experiment was to determine the effect of plant density and pattern on growth characteristics, total dry matter yield. protein yield and palatability of sorghum-sudangrass hybrid (Sordan 79). The main treatment was three levels of plant density (Skg, 15kg. 30kg/ha) and the sub treatment was two plant patterns of square and rectangular planting.The experiment was arranged as a split plot design and conducted on the Experimental Livestock Farm of Kon-Kuk Univ. in Chungju, 1989. The results obtained are summarized as follows :1. As the plant density was increased, plant length, leaf length, leaf width(P<0.05) and leaf number were gradually decreased, but in the same plant density, plant length, leaf length, leaf width and leaf number were generally increased in the rectangular plot. 2. In the first cutting time, the ratio of leaf was the highest at the rectangular plot of high density (30kg/ha, 25cm$\times$4cm), but in the second cutting time, the ratio of leaf was the highest at the square plot of medium density (15kg/ha, 14cm$\times$ 14cm). 3. The ratio of dead stubble after cutting was generally increased by increasing the plant density. Also, in the same planting density, the ratio of dead stubble was generally increased in the square plot. 4. The tiller number per plant tended to decreased by increasing thc plant density, and the tiller number was increased in the rectangular plot. In the same plant density. 5. Total fresh and dry matter yield were the highest at the rectangular plot of medium density (IS kg/ha, 33cm$\times$6cm) wholly, but the low density was shown the lowest.6. The crude protein content was increased by increasing the plant density per unit area(P<0.05) and the protein yield was also increased by increasing the planting density. 7. According to the increase of plant density, the stem was thinned, but NDF, ADF did not show different. The palatability was in the order of high (30kg/ha))medium (15kg/ha))low density(5kgiha) at the first cutting time, but it was in the order of high)low)medium density at the second cutting time.

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Effect of Plant Density and Planting Pattern on the Growth Chracteristics , Dry matter Yield and Feeding Value of Sorghum -Sudangrass Hybrid (파종량과 재식양식이 수수-수단그라스계 잡종의 생육특성 , 건물수량 및 사료가치에 미치는 영향)

  • 전병태;이상무;신동은;문상호;김운식
    • Journal of The Korean Society of Grassland and Forage Science
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    • v.12 no.1
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    • pp.19.2-19.2
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    • 1992
  • The purpose of the experiment was to determine the effect of plant density and pattern on growthcharacteristics, total dry matter yield. protein yield and palatability of sorghum-sudangrass hybrid(Sordan 79). The main treatment was three levels of plant density (Skg, 15kg. 30kg/ha) and the subtreatment was two plant patterns of square and rectangular planting.The experiment was arranged as a split plot design and conducted on the Experimental Livestock Farm of Kon-Kuk Univ. in Chungju, 1989.The results obtained are summarized as follows :1. As the plant density was increased, plant length, leaf length, leaf width(P<0.05) and leaf number were gradually decreased, but in the same plant density, plant length, leaf length, leaf width and leaf number were generally increased in the rectangular plot.2. In the first cutting time, the ratio of leaf was the highest at the rectangular plot of high density(30kg/ha, 25cm$\times$4cm), but in the second cutting time, the ratio of leaf was the highest at the square plot of medium density (15kg/ha, 14cm$\times$ 14cm). 3. The ratio of dead stubble after cutting was generally increased by increasing the plant density. Also, in the same planting density, the ratio of dead stubble was generally increased in the square plot. 4. The tiller number per plant tended to decreased by increasing thc plant density, and the tiller number was increased in the rectangular plot. In the same plant density. 5. Total fresh and dry matter yield were the highest at the rectangular plot of medium density (ISkg/ha, 33cm$\times$6cm) wholly, but the low density was shown the lowest.6. The crude protein content was increased by increasing the plant density per unit area(P<0.05) and the protein yield was also increased by increasing the planting density. 7. According to the increase of plant density, the stem was thinned, but NDF, ADF did not show different. The palatability was in the order of high (30kg/ha))medium (15kg/ha))low density(5kgiha)at the first cutting time, but it was in the order of high)low)medium density at the second cutting time.

A study on the influences operating Efficiency of a Tractor in the condition of Farmland (농경지조건과 Tractor 작업효율에 관한 연구)

  • 이기춘
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.14 no.2
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    • pp.2603-2609
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    • 1972
  • A study on how the condition of farmland influences operating efficiency of a tractor came up with the following results in the primary experiment. (1) $10m{\times}30m$ plot of which length is shortest in this experiment, took a maximum of required time per onea plow, whereas $20m{\times}120m$ plot, whose length is longest in the same experiment, took a minimum of required time per one a to plow. It reveals, accordingly, that the proportion between width and length should be 1:6; the most desirable proportion that proves to most profitable in terms of time. (2) All the available efforts were made to diminish some unplowed parts of plot to a minimum. It was revealed, however, in the experiment that the ratio of unplowed plot leads to 7.52% in the plot 6; the highest ratio, and 3.44% in the plot 1; the lowe ratio. That shows us that the ratio of availability of land be higher in a more rectangular plot. (3) But even a rectangular plot allows lower ratio of availability in case that the width is narrow. It is showed that a higher ratio of availability can be obtained in when the width of plot is more than 20 meters at minimum. (4) In the operation of plowing by using a tracter, It was also revealed that we could not but have a quite a considerable loss in terms of both the ratio of availability and the required tine for plowing unless we maks a plan to with the unplowed part of plot.

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Variation Analysis of Elevation within a Rice Paddy Field (수도작 포장의 고저차 분석)

  • Sung J.H.;Jang S.W.
    • Journal of Biosystems Engineering
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    • v.31 no.3 s.116
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    • pp.188-193
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    • 2006
  • Elevation differences within a paddy field relate strongly to plant health, crop homogeneity, and pest control. For precision agriculture (PA), the elevation within a field should be precisely controlled. We analyzed variation in elevation within a rice paddy field over one crop cycle. The study took place in a rectangular plot (100 m x 30 m). Elevations within the a plots was measured by a laser-equipped surveying instrument, that could determine elevations to precisions of I mm. The test field was divided into grids with 30 squares; elevation was measured at the center of each 5 x 10-m grid square. This study measured elevation during nine observation periods from pre-plowing to post-harvest. Descriptive statistics showed the highest elevations after plowing due to soil disturbance. One-way analysis of variance (ANOVA) revealed significant elevation differences before and after plowing and transplanting, although elevations were similar over the period of crop growth. Comparison of pre-plowing and post-harvest data showed differences in elevations, indicating that elevation changes occurred during plowing, rice transplanting, plant growth, and harvesting. In summary, the above statistical analysis indicated that elevation changes occurred due to plowing but not during the plant growth season or due to harvesting.