Loading [MathJax]/jax/output/CommonHTML/jax.js
  • Title/Summary/Keyword: Irrigation characteristics

Search Result 423, Processing Time 0.023 seconds

Effects of Irrigation Times and Soil Media on the Growth and Physiological Characteristics of Native Fern Asplenium scolopendrium (관수주기와 상토조성이 자생 골고사리(Asplenium scolopendrium)의 생육과 생리에 미치는 영향)

  • Ju, Jin-Hee;Bang, Kwang-Ja
    • Journal of the Korean Institute of Landscape Architecture
    • /
    • v.32 no.6 s.107
    • /
    • pp.109-116
    • /
    • 2005
  • This study was conducted to examine the growth and physiological characteristics of Asplenium scolopendrium native fern as affected by irrigation times and soil media as an environment modeled on habitate where was sunken-condition. 1. Light intensity was lower in sunken than in non-sunken, but air humidity was higher in sunken about 2040%. Soil moisture content was higher with the leaf mold in sunken irrigating 2 times/week. The results of chemical analysis of medium showed that EC, pH, organic matter content, total nitrogen, CEC, Exch-Ca, Exch-Mg and Exch-K were higher with leaf mold than sud: leafmold and field soil: sud: leaf mold. 2. In the case of irrigation 2 times/week Asplenium scolopendrium grew well sunken more than non-sunken. As non-sunken condition similar with, 7 times/week irrigation, plant height, frond width, frond length and stipe length increased. In case of soil media, growth of Asplenium scolopendrium was better with leaf mold than that of sand: leafmold or field soil: sand: leaf mold. 3. In the case of irrigation 2 times/week photosynthetic rate, CO2 absorption rate and water efficiency were higher with non-sunken than that of sunken, expect of stomatal conduction, CO2 use efficiency. The physiological characteristics of Asplenium scolopendrium were highest in non-sunken irrigating 7 times/week In case of soil media, physiological activity was higher with leaf mold than sand: leafmold or field soil: sand: leaf mold.

Growth Characteristics of Woody Plants for Irrigation Management of Container Gardens

  • Jeong, Na Ra;Han, Seung Won;Kim, Jae Soon
    • Journal of People, Plants, and Environment
    • /
    • v.23 no.5
    • /
    • pp.507-519
    • /
    • 2020
  • Background and objective: This study analyzed the growth characteristics, in relation to the soil moisture content, of trees planted in an environment with limited soil depth to provide the baseline data for effective irrigation management. Methods: The experimental treatment was divided into soil moisture contents (SMC) of 20%, 15%, 10%, 5%, and 1%, and the respective watering times were set accordingly. As for plant materials, Nandina domestica, Euonymus alatus, Thuja occidentalis, Hibiscus syriacus, Pinus densiflora, and Pyracantha angustifolia, were chosen for this study, because they are highly likely to be used in urban street environments. Results: The minimum irrigation point suitable for each species was determined by considering various aspects of visual quality and water efficiency in terms of plant growth, including characteristics such as height, root diameter, rootlet development, and weight. Our results indicate that N. domestica should be watered so that the moisture content of the soil is of at least 5%, based on the balance between the stem and roots, as well as on visual quality. E. alatus and P. angustifolia are suitable for watering that results in at least 10% SMC, considering the height, root growth, weight, and visual quality of plants. As for T. occidentalis, it showcases moderate growth with a soil moisture content of at least 5%. Finally, the minimum irrigation time required to obtain 15% SMC is appropriate, in terms of plant growth, fresh weight, and visual quality, for H. syriacus and P. densiflora. Conclusion: This study suggested a basic irrigation guideline for container gardens where trees planted in environments with limited soil depth can be managed so that they are visually appropriate and in good condition of growth.

Evaluation of the Basic Unit of Irrigation water used on Golf Courses in Jeju Island (골프장 관개용수 원단위 산정에 관한 연구)

  • Park, Won-Bea;Yang, Sung-Kee;Kim, Bong-Seok;Moon, Duk-Chul
    • Journal of Environmental Science International
    • /
    • v.20 no.6
    • /
    • pp.775-782
    • /
    • 2011
  • The purpose of this study was to evaluate the basic unit of irrigation water on golf courses in Jeju Island. The amounts of rainwater and groundwater used on 20 golf courses have been monitored for this study. The characteristics of rainwater and groundwater from the selected 20 golf courses were analyzed based on the existing data that had been collected for three consecutive years from 2006 to 2009. The range of monthly irrigation water (groundwater + rainwater) used was about 13,20055,600m3/month, with average of 36,600m3/month. In the respects of the amount of annual water used, groundwater was recorded as 163,500m3/year, and rainwater was recorded as 275,400m3/year. Thus, the total annual irrigation water used was approximately 439,000m3/year. The correlation (R2) between golf course lot size and average amount of monthly irrigation water used was 0.65, and the monthly basic unit per golf course area (1,000m2) was calculated as 60m3.

Responses of Soybean Cultivars to Excessive Soil Moisture Imposed at Different Growth Stages

  • Seong, Rak-Chun;Sohn, Joo-Yong;Shim, Sang-In
    • KOREAN JOURNAL OF CROP SCIENCE
    • /
    • v.45 no.5
    • /
    • pp.282-287
    • /
    • 2000
  • Soybean [Glycine max (L.) Merrill] crops, grown in a rice soybean rotation, can suffer when grown in soil with excessive moisture. The objective of this work were to determine the reduction in growth and yield, responses of vegetative and reproductive growth of soybean to excessive soil moisture achieved by prolonged irrigation. Responses of different cultivars were determined at growth stages from V6 to R8 to clarify the sensitive growth stages or characteristics to excessive soil moisture. Cultivar differences in response to excessive soil moisture condition were conspicuous in seed dry weight and harvest index (HI) but not in the response of seed number or pod number per plant. The timing of irrigation causing the condition of excessive soil moisture influenced the vegetative or reproductive traits. Soybean plants were more affected by irrigation commencing at the pre-flowering than at the post-flowering stage. Post-flowering irrigation did not reduce growth of vegetative organs significantly; in fact the growth of stems and leaves was facilitated by the prolonged irrigation commencing at flowering. Differences between cultivar response to prolonged irrigation were assumed to relate to the reduced amount of assimilates translocated to the reproductive organ.

  • PDF

Unit Loads of Pollutants in a Paddy Fields Area with Large-Scaled Plots during Irrigation Seasons (관개기 대구획 광역논에서의 오염부하 원단위)

  • 오승영;김진수;김규성;김선종;윤춘경
    • Magazine of the Korean Society of Agricultural Engineers
    • /
    • v.44 no.2
    • /
    • pp.136-147
    • /
    • 2002
  • Characteristics of unit loads of pollutants were investigated at a paddy fields area(Soro-ri) with large-scaled plots on loam soil during irrigation seasons of 1999 ∼2000. The average irrigation requirement of experimental paddy area are estimated at over 3,000 mm. The unit loads of pollutants in paddy fields area are determined by subtracting irrigation water load from outflow load (percolated and surface outflow loads). Surface outflow load in rainy days was calculated using the relationships of discharge and load, which are grouped into fertilizing and non-fertilizing periods. The ratios of the surface outflow load in rainy days to the total surface outflow load are 16.4% for T-N, 26.8% for T-P, and 23.3% far CODc,. The unit loads of pollutants show month-to-month and year-to-year variations, and monthly unit load of pollutants can show negative values, indicating that the paddy area acts as the pollutants sink. The average unit loads of the pollutants during irrigation seasons were estimated at 18.2 kg/ha fur T-N, 0.31 kg/ha for T-P, and 43.3 kg/ha for CODc,, which are smaller than the reported values for Kosei area in Japan.

Multi regression analysis of water quality characteristics in lowland paddy fields

  • Kato, Tasuku
    • Proceedings of the Korea Water Resources Association Conference
    • /
    • 2012.05a
    • /
    • pp.36-36
    • /
    • 2012
  • Drainage water in lowland paddy fields is quantitatively influenced recycle and/or repeated irrigation by irrigation facilities, i.e. pumps, check gates, small reservoirs and so on. In those drainage channels, nutrients accumulation and increasing organic matters are considered to be occurred, and water quality would be degraded not only environmental aspect but irrigation purpose. In general, Total Nitrogen (T-N) is interested water quality index in irrigation water, because high nitrogen concentration sometimes caused decreasing rice production by excess growth and fallen or degrading quality of taste, then, farmers would like to clear water less than 1mg/L of T-N concentration. In drainage channel, it is known that the nitrogen concentration change is influenced by physical, chemical and biological properties, i.e, stream or river bed condition, water temperature, other water quality index, and plant cover condition. In this study, discharge data (velocity and level) in a drainage channel was monitored by an Acoustic Doppler system and water quality was sampled at same time in 2011. So those data was analyzed by multi regression model to realize hydrological and environmental factors to influence with nitrogen concentration. The results showed the difference tendency between irrigation and non-irrigation period, and those influenced factors would be considered in water quality model developing in future.

  • PDF

Characteristics of Non-Point Sources Pollutant Loads at Paddy Plot Located at the Valley Watershed during Irrigation Periods (관개기 곡간지 유역 필지논에서의 비점원오염물질 유출특성)

  • Han, Kuk-Heon
    • KCID journal
    • /
    • v.18 no.1
    • /
    • pp.94-102
    • /
    • 2011
  • The aim of this study was to evaluate the load of non-point sources pollutant at a paddy plot located at the valley watershed during irrigation period. Irrigation, runoff and water quality data in the paddy plot were analyzed periodically from June 1 to October 31 in 2005. The observed amount of precipitation, irrigation, runoff for the experimental paddy plot during the irrigation period was 1,297.8, 223.2, and 825.4mm, respectively. Total-N concentrations ranged from 3.73 to 18.10mg/L, which was generally higher than the quality standard of agricultural water (1.0mg/L). Total-P concentrations ranged from 0.111 to 0.243mg/L and the average was 0.139mg/L. The observed runoff pollutants loadings from the paddy plot were measured as 34.4 kg/ha for T-N, 1.0 kg/ha for T-P and 213.8 kg/ha for SS. The non-point sources pollutant load in drainage water depends on rainfall and surface drainage water amount from the paddy plot. We are considering that these results were affected by rainfall as well as hydrological condition, soil management, whether or not fertilizer application, cropping, rice straw and plowing.

  • PDF

Analysis of the Characteristics of Nutrients Loading and the Water Purification Function in the Paddy-fields (논의 영양물질 배출부하 특성과 수질정화 기능 분석)

  • Kim Hyoon Soo;Kim Jin Soo;Kim Young Il;Cheong Byeong Ho
    • KCID journal
    • /
    • v.11 no.1
    • /
    • pp.36-44
    • /
    • 2004
  • The objective of this study is to analyze the characteristics of the nutrients loading and the water purification function in the paddy-fields. This study was carried out based on the research data in the three case studies. 1. Irrigation requirement is m

  • PDF

Characteristics of Soils Under Protected Cultivation (시설재배지토양의 이화학적 특성변화)

  • 홍성구;이남호;전우정;황한철;남상운;윤영순
    • Magazine of the Korean Society of Agricultural Engineers
    • /
    • v.40 no.1
    • /
    • pp.88-95
    • /
    • 1998
  • Salt accumulation is frequently experienced in soils under protected cultivation. Since protected cultivation does not bave rainfall and resulting infiltration, salt accumulation in the soils is inevitable. In this study, analyzed were chemical characteristics of soils under protected cultivation to investigate the factors which may contribute the salt accumulation. Soil samples were collected from 99 protected cultivation facilities around Ansung-Gun, Gyungki-Do and analyzed for electrical conductivity, PH, organic matter contents. The results showed that there was no significant trend of changes in electrical conductivity and pH along cultivation years. The only factor influencing salt acculmuation was irrigation type. Soils in facilities using drip irrigation showed higher electrical conductivity than these using diversion-hose type irrigation.

  • PDF

Research on the Sediment Characteristics in Change Structural Shape of Agricultural Irrigation (농업용수로 구조적 형상 변화에 따른 퇴적 특성 연구)

  • Park, Jung Koo;Kim, Myeong Hwan;Song, Chang Seob
    • Journal of The Korean Society of Agricultural Engineers
    • /
    • v.57 no.6
    • /
    • pp.69-77
    • /
    • 2015
  • The objective of this study was to evaluate the performance of selected sediment reduction methods to reduce sediment discharges from drain and irrigation of different types (concrete canals, soil canals). This study was carried out to analysis for the suspended sediment concentration and sediment of drain and irrigation by velocity of flow. The results of study were analysised and summerized as follow. Sedimentation characteristics and size of soil sediment from the concrete and soil canals of downstream smaller than upstream. Suspended sediment concentration and flow times from the suggestion canals bigger than open canal. Structural shape of the canal decreases the velocity of flow also affects the suspended sediment concentration and flow times.