• Title/Summary/Keyword: saline soils

Search Result 103, Processing Time 0.027 seconds

Study on the Salt Tolerance of Rice and other Crops in Reclaimed Soil Areas 13. On the Absorption of the Mineral Elements of Rice and the Components of Rice Grains in Reclaimed Saline Soils (간척지에서 수도 및 기타작물의 내염성에 관한 연구 13. 간척지에서 수도의 무기양분 흡수와 쌀 성분에 관하여)

  • 임형빈
    • Journal of Plant Biology
    • /
    • v.14 no.1
    • /
    • pp.25-31
    • /
    • 1971
  • In order to observe the absorption pattern of mineral elements and the nutritional components of brown rice grown in reclaimed saline areas in Korea, the four commercial varieties of rice were cultured at the average salt concentration of 6.05 mmhos/cm, $25^{\circ}C$, (0.3%) in saline soils and non-saline silty loam soils. In the saline areas the absorptin of Na and Si was relatively high while the absorption of P, K and Ca was relatively low. N was absorbed actively before the emergence of the rice grains but showed relative decrease thereafter. There was no difference in Mg content. Though brown rice in the saline areas contained sugar abundantly with small contents of protein, fat and crude fiber. There was little difference in total carbollydrate and ash contonts.

  • PDF

Growth of Dendranthema zawadskii in Chloride-containing De-icing Salt Areas Upon Treatment With Soil Amendments (제설제 피해지에서 토양개량제 처리에 따른 구절초의 생육특성 비교)

  • Ju, Jin-Hee;Yang, Ji;Park, Sun-Young;Yoon, Yong-Han
    • Journal of Environmental Science International
    • /
    • v.30 no.3
    • /
    • pp.235-243
    • /
    • 2021
  • This study was conducted to investigate the growth of Dendranthema zawadskii in damaged soils when they are treated with improvement agents. The treatments consisted of a control (unamended field soil) and the application of a loess ball of 1 cm to the field soil. According to the degree of damage the de-icing agent had caused, the soils were divided into 3 areas (based on the yellowing of Pinus densiflora for. multicaulis in soil surveys): H (high saline), M (medium saline), and L (low saline). A total of six treatments were performed: D. zawadskiia plant without soil amendment (H; high saline soil, M; medium saline soil, L; low saline soil), and a D. zawadskiia plant with loess ball on the soil surface (H.L; high saline soil with loess ball, M.L; medium saline soil with loess ball, L.L; low saline soil with loess ball). The results showed that D. zawadskiia growth went from highest to lowest in the order: M.L > L.L > M > L > H.L > H. Plant growth results showed that soils treated with soil amendments (loess ball) were better for D. zawadskii growth than untreated soils.

Study on the Salt Tolerance of Rice and other Crops in Reclaimed Soil Areas 15. The Effects of Salt on the Efficiency of Sunlight Utilization of Rice Canopy in Reclaimed Saline Soils (간척지에서 수도 및 기타 작물의 내염성에 관한 연구 15. 간척지에 재배한 수도 엽층의 수광 효과에 미치는 염분의 영향)

  • 임형빈
    • Journal of Plant Biology
    • /
    • v.14 no.3
    • /
    • pp.60-65
    • /
    • 1971
  • In order to observe the factors affecting light utilization efficiency in the canopy of a rice crop grown in reclaimed saline areas in Korea, 22 varieties of rice were cultured at the average salt concentration of 6.05mmhos/cm $25^{\circ}C$, (0.39%) in saline soils and non-saline silty loam soils. The inhibition of tillering ability by salt damage at the maximum tillering stage was greater than to growth in height. A significant direct correlation was observed between both ratios and salt concentration with each variety. In the salty areas the length of the flag leaf of the maturing stage showed a positive correlation with the production of rough rice while other living leaf showed a negative correlation. LAI of maturing stage was less in the salty area than in the non-salty area, while the former showed higher ratio in net assimilation and translocation to head with greater RGR before and after the heading stage.

  • PDF

Mitochondrial OXPHOS genes provides insights into genetics basis of hypoxia adaptation in anchialine cave shrimps

  • Guo, Huayun;Yang, Hao;Tao, Yitao;Tang, Dan;Wu, Qiong;Wang, Zhengfei;Tang, Boping
    • Genes and Genomics
    • /
    • v.40 no.11
    • /
    • pp.1169-1180
    • /
    • 2018
  • Cave shrimps from the genera Typhlatya, Stygiocaris and Typhlopatsa (TST complex) comprises twenty cave-adapted taxa, which mainly occur in the anchialine environment. Anchialine habitats may undergo drastic environmental fluctuations, including spatial and temporal changes in salinity, temperature, and dissolved oxygen content. Previous studies of crustaceans from anchialine caves suggest that they have possessed morphological, behavioral, and physiological adaptations to cope with the extreme conditions, similar to other cave-dwelling crustaceans. However, the genetic basis has not been thoroughly explored in crustaceans from anchialine habitats, which can experience hypoxic regimes. To test whether the TST shrimp-complex hypoxia adaptations matched adaptive evolution of mitochondrial OXPHOS genes. The 13 OXPHOS genes from mitochondrial genomes of 98 shrimps and 1 outgroup were examined. For each of these genes was investigated and compared to orthologous sequences using both gene (i.e. branch-site and Datamonkey) and protein (i.e. TreeSAAP) level approaches. Positive selection was detected in 11 of the 13 candidate genes, and the radical amino acid changes sites scattered throughout the entire TST complex phylogeny. Additionally, a series of parallel/convergent amino acid substitutions were identified in mitochondrial OXPHOS genes of TST complex shrimps, which reflect functional convergence or similar genetic mechanisms of cave adaptation. The extensive occurrence of positive selection is suggestive of their essential role in adaptation to hypoxic anchialine environment, and further implying that TST complex shrimps might have acquired a finely capacity for energy metabolism. These results provided some new insights into the genetic basis of anchialine hypoxia adaptation.

Salinity Effects on the Hydraulic Conductivity of Uplands (밭토양(土壌)의 수리전도도(水理伝導度)에 대(対)한 염류효과(塩類効果))

  • Park, Chang-Seo;O'Connor, George A.
    • Korean Journal of Soil Science and Fertilizer
    • /
    • v.16 no.1
    • /
    • pp.7-13
    • /
    • 1983
  • Laboratory determinations of saturated hydraulic conductivity were conducted with four soils varying in texture from sand to clay and with five waters with different salinity level. The waters varied in total dissolved solids from 1,250 to $15,000mg/{\ell}$ and in SAR from 16 to 57 and were representative of saline waters in New Mexico. Saturated hydraulic conductivities of the soils were not significantly affected by water salinity if these waters were the sole source of irrigation water. However, small additions of distilled water, assuming simulated to rain, to soils previously equilibrated with the saline waters significantly decreased soil permeability. Dispersion and short or long-distance transport of clay apparently clogged conducting pores when distilled water was introduced. Swelling was an important mechanism in reducing soil permeability only in the clay soil. The data suggest that, when saline water is the dominant irrigation source and is supplemented by rain, (1) all saline waters could be used on very sandy soils, (2) no saline waters should be used on very heavy soils, and (3) slightly saline, but not very saline, waters could be used on medium-textured soils.

  • PDF

Assessment and Correlation of Saline Soil Characteristics using Electrical Resistivity

  • Mustapha Maliki;Fatima Zohra Hadjadj;Nadia Laredj;Hanifi Missoum
    • Journal of Electrochemical Science and Technology
    • /
    • v.14 no.3
    • /
    • pp.205-214
    • /
    • 2023
  • Soil salinity is becoming one of the most devastating environmental hazards over the years. Soil investigation involves fast, low cost and non disturbing methods to measure soil characteristics for both construction projects as well as for agricultural use. The electrical resistivity of saline soils is greatly governed by salt concentration and the presence of moisture in soil matrix. Experimental results of this investigation highlight that there is a significant relationship between the electrical resistivity of soil samples mixed with chloride solutions (NaCl, KCl, and MgCl2) at various concentrations, and soil physical properties. Correlations represented by quadratic functions were obtained between electrical resistivity and soil characteristics, namely, water content, degree of saturation and salt concentration. This research reveals that the obtained correlations between electrical resistivity, salt concentration, water content and degree of saturation are effective for predicting the characteristics of salt affected soils in practice, which constitute a governing element in the assessment of saline lands sustaining infrastructure.

Measurement of Exchangeable Cations in Salt Accumulated Vinyl Greenhouse Soils (염류집적 비닐하우스 토양의 교환성 양이온 측정)

  • Chung, Jong-Bae;Lee, Yong-Se;Jeong, Byeong-Ryong
    • Korean Journal of Environmental Agriculture
    • /
    • v.37 no.1
    • /
    • pp.21-27
    • /
    • 2018
  • BACKGROUND: Although 1 M $NH_4OAc$ (pH 7.0) is predominantly used as the extractant of exchangeable cations in agricultural soils, this method is unsuitable for extracting the cations in saline and calcareous soils. This study was performed to select a proper method to determine exchangeable cations in vinyl greenhouse soils. METHODS AND RESULTS: Exchangeable cations (Ca, Mg, K, Na) in saline vinyl greenhouse soils were determined after extraction with 1 M $NH_4OAc$ (pH 7.0 and 8.5) and 1 M alcoholic $NH_4Cl$ (pH 8.5). Sum of exchangeable cations of the soils extracted with 1 M $NH_4OAc$ at pH 7.0 was 1.9-2.5 times greater than soil cation exchange capaity determined at pH 7.0, even though soluble salts were pre-removed. A similar result was found when the cations were extracted with 1 M $NH_4OAc$ at pH 8.5. Those results are mostly due to the overestimation of exchangeable Ca and Mg, linked to a partial dissolution of sparingly soluble salts in $NH_4OAc$ solution. When extracted with 1 M alcoholic $NH_4Cl$ at pH 8.5, extractable Ca and Mg decreased significantly due to the lower solubility of Ca and Mg carbonates in the extractant. And the sum of exchangeable cations was very close to the corresponding exchange capacity of soils. CONCLUSION: Alcoholic $NH_4Cl$ (pH 8.5) is proposed as a reliable extractant in determination of exchangeable cations in saline vinyl greenhouse soils. And soluble salts should be removed prior to the extraction of exchangeable cations.

Intercropping of Cow Pea (Vigna unguiculata) as Summer Forage Yield with Grewia tenax in Irrigated Saline Soil of Khartoum State, Sudan

  • Abdalla, Nasre Aldin Mustafa;Alawad, Seid Ahmed Hussein;ElMukhtar, Ballal Mohamed
    • Journal of Forest and Environmental Science
    • /
    • v.38 no.2
    • /
    • pp.122-127
    • /
    • 2022
  • Agroforestry in terms of intercropping cow pea as summer forage with Grewia tenax was undertaken under sub -irrigation system in two consecutive seasons of 2017 and 2018 in saline soil of Khartoum State of Sudan. The aims were to find out suitable agro forestry system for saline soils as well as to investigate effect of tree spacing on field summer forage crop under semi -irrigation system. Therefore G. tenax trees that spaced at 4×4 m were used as main factor versus cow pea crop that incorporated at 25×50 cm intervals by using completely randomized block design with 3 replications. Trees and crop parameters were determined in terms of plant growth and yield. In addition to land equivalent ratio and soil chemical and physical properties at different layers were determined. The results revealed that, soil parameters in terms of CaCo3, SAR, ESP, pH paste and EC ds/m were increased with increasing soil depths. Meanwhile tree growth did not show any significant differences in the first season in 2017. Whereas in the second season in 2018 tree growth namely; tree height, tree collar and canopy diameters were higher under intercropping than in sole trees. Cow pea plant height recorded significant differences under sole crop in the first season in 2017. Unlike the forage fresh yield that was significant under the inter cropped plots. Tree fruit yield was higher under sole trees and land equivalent ratio was more advantageous under GS2 (1.5 m) which amounted to 4. Therefore it is possible to introduce this agroforestry system under saline soils to provide summer forage of highly nutritive value to feed animals and to increase farmers' income as far as to halt desertification and to sequester carbon.

Hydraulic Property and Solute Breakthrough from Salt Accumulated Soils under Various Head Pressures

  • Lee, Sanghun;Chung, Doug-Young;Hwang, Seon-Woong;Lee, Kyeong-Bo;Yang, Chang-Hyu;Kim, Hong-Kyu
    • Korean Journal of Soil Science and Fertilizer
    • /
    • v.45 no.5
    • /
    • pp.717-724
    • /
    • 2012
  • Salt accumulated soil should be reclaimed to lower salt level for crop production. This study was carried out to investigate the characteristics of water flow and transport of mono and divalent solutes on salt accumulated soils with different head pressures. Saturated hydraulic conductivity was measured by constant and falling head methods with maintaining different head pressures. Saturated hydraulic conductivity was influenced by bulk density and organic matter contents in soils, but it had different elusion patterns between saline and sodic soil. While the quantity of water necessary for reclamation could be varies with soil type, it was considered that the supply of one pore volume of water was affordable and economic. Additional head pressure significantly increased the volume of leachate at a given time and it was more effective at low organic matter soils. The results indicate that additional head pressure would be one of the best irrigation practices on desalination method for salt accumulated soils.