• Proceedings of the Korean Society of Crop Science Conference
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• 2005.08a
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• pp.136-137
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• 2005

• Proceedings of the Korean Society of Crop Science Conference
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• 2005.08a
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• pp.134-135
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• 2005

• Korean Journal of Soil Science and Fertilizer
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• v.40 no.3
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• pp.173-180
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• 2007

Reclaimed tidal area is a great agricultural resource in the world. Improvement and utilization of reclaimed soil is an important measure for expanding land resource. This study was conducted to evaluate relative salt-tolerance of plants and its effect for improving saline soil. Eighteen tolerance plants were selected from China, Pakistan and Korea the climate of which is different. The emergence of different varieties in reclaimed soil was in order as FL478>Barnyard grass>Pokkali>Atriplex>Sesbania>Rumex>Alfalfa>Tall Fescue>Ryegrass>Sudan grass. Four varieties, Barnyard grass, Sesbania, Atriplex and Limonium were selected for soil improvement in reclaimed land. Cultivation of Sesbania, Barnyard grass and Atriplex were good to soil physico-chemical quality. Also these plants increased soil organic matter contents and reduced soil salt concentration. Organic matter contents of cultivated soils of Sesbania, Barnyard grass and Atriplex were $4.10g\;kg^{-1}$, $4.60g\;kg^{-1}$ and $2.81g\;kg^{-1}$ respectively. On the other hand organic matter content of uncultivated soils was $2.65g\;kg^{-1}$. As Sesbania and Barnyard grass were applied to cultivated soil like green manure, bulk density improved from $1.42Mg\;m^{-3}$ to $1.39Mg\;m^{-3}$.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.50 no.spc1
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• pp.41-45
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• 2005

This experiment was carried out to identify the proper transplanting time at reclaimed saline land in the southwestern area of Korea from 2002 to 2004. The rice cultivars tested were Samcheonbyeo(Early maturing one), Nampyeongbyeo (Medium maturing one) and Hwaseongbyeo(Mid-late maturing one). The results are summarized as follows: No. of spikelet per the unit area was higher at transplanting on May 20 than those of the other transplanting time. when Samcheonbyeo was transplanted early, the ripened grain rate was high. But, Hwaseongbyeo and Nampyeongbyeo wasn't differ among transplanting time. The yield of milled and head rice(YMHR) was high transplanted May 20 in Samcheonbyeo, May 30 in Hwaseongbyeo, from May 20 to June 9 in Nampyeongbyeo. Among the varieties YMHR was higher in the order of Hwaseongbyeo, Samcheonbyeo and Nampyeongbyeo. There wasn't different of amylose and protein content among the transplanting time and varieties. But, palatability value was low transplanted early(May 20). Considering the rice growth, the rice good quality, the yield of milled and head rice, the proper transplanting time was May 20 to May 30 in Samcheonbyeo and Hwaseongbyeo, whereas Nampyeongbyeo was from May 20 to-June 9.

• Journal of the Korean Geophysical Society
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• v.8 no.3
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• pp.145-152
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• 2005

216 groundwater samples for inorganic constituents and 168 samples for VOCs in the Ulsan urban ares and analyzed to relate groundwater chemistry to four land use zones, residence․commercial, industrial, agricultural, and forestry. In general, Na and Cl concentrations in groundwater were high in residence․commercial zone near Taehwa river due to residual saline. Although NO3 contents is high in agricultural zone and VOCs content is high in industrial zone, it seems difficult to relate groundwater pollution to land use zone. Even though groundwater pollution of the area is still low, continuous monitoring is necessary because the city is expanding.

• Proceedings of the Korean Society of Agricultural Engineers Conference
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• 2003.10a
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• pp.79-82
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• 2003

This study was performed in order to analyze the changes of electrical conductivity during the growing period in Saemangum reclaimed tidal lands soils. According to USDA Salinity Laboratory classification system of salt affected soils, the reclaimed tidal land soils used in this study were saline-sodic soils. As the results obtained from analying the changes of electrical conductivity(EC) during the growing period in reclaimed tidal land soils, EC of irrigation water and soils were no difference among the fertilization quanity, fertilization method and fertilization times.

• Proceedings of the Korean Society of Crop Science Conference
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• 2005.04a
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• pp.46-47
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• 2005

• Journal of Forest and Environmental Science
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• v.39 no.1
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• pp.20-26
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• 2023

Cow pea (Vigna unguiculata) was intercropped with Ziziphus spina-christi as summer forage in two consecutive seasons of 2017 and 2018. The aims to find out suitable agroforestry practice for saline soils of Khartoum State. And to investigate effect of tree spacing on forage biomass yield under semi -irrigated systems. Completely randomized block design with 3 replicates was conducted for this trial. Thus Z.spina-christi that fixed at 4×4 m was intercropped with cowpea at 1 m and 1.5 m spacing from trees trunk. Tree growth parameters were measured in terms of tree height, tree collar diameter, tree crown diameter and fruit yield per tree. While crop were parameters were determined in terms of plant height, number of plant, forage biomass yield per ha and land equivalent ratio. Soil profile of 1×1 m and 1.5 m depth was excavated and its features were described beside its chemical and physical properties were analyzed for 0-10 cm, 0-30 cm, and 30-60 cm and 60-100 cm layers. The results revealed that soil pH, CaCO₃, SAR, ESP, and EC ds/m were increased by increasing soil depths. Meanwhile tree growth in terms of tree height was significant in the first season 2017 when compared with tree collar diameter and tree crown diameter. Also significant differences were recorded for tree growth when compared with sole trees in the second season in 2018. Tree fruit showed marked variations between the two seasons, but it was higher under intercropping particularly at ZS2. Crop plant height was highly significant under sole cropping than intercropping in first season in 2017. In contrast forage biomass yield was significant under intercropping in ZS1 and ZS2 treatments. Land equivalent ratio was advantageous under this agroforestry system particularly under ZS2. Thus it recorded 5 and 9 for ZS2 in the two consecutive seasons respectively. Therefore, it is feasible to introduce this agroforestry system under such arid lands to provide summer forage yield of highly nutritive value and low cost for animals feed as well as to increase farmers' income and to halt desertification and to sequester carbon.

• Applied Biological Chemistry
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• v.44 no.2
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• pp.92-96
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• 2001

Soil physical-chemical properties and phosphorous adsorption characteristics were investigated to obtain the informations of the appropriate fertilization and soil management in Baicheng region, China, where agricultural circumstances at present forces to consider the use of land for crop production. Soils were collected from one uncultivated and three cultivated lands on August 1993. Soil $_PH$ was very higher in uncultivated land than in cultivated land, their values were 10.2 and 7.4, respectively. Regardless of cultivation, soil organic matter contents were below 2%, and concentrations of available soil phosphorus expressed as Bray 1 P and Olson P were less than 10 mg P $kg^{-1}$, however, cation exchange capacity was higher than 20 cmol(+) $kg^{-1}$. For uncultivated soil, the values of exchangeable sodium percent and calcium saturation percent were higher than 100%. The major cation of soil saturation paste extracts was Na regardless of land use type. Based on electrical conductivity and sodium adsorption ratio of saturation paste extracts, uncultivated soil was classified as saline-sodic soil and cultivated soil was classified as sodic or normal soil. The maximum adsorption capacity of phosphorus calculated by Langmuir isotherm ranged from 406 to 521 mg P ,$kg^{-1}$. The constraints of soils in Baicheng regions for agricultural cops werw high salt concentration, unfavorable soil chemical composition such as low concentration of available phosphorous, and poor drainage due to soil dispersion by high Na concentration. Therefore, the soil in Baicheng region, need the application of phosphorus fertilizer to increase the soil fertility and the proper soil management to improve the soil physical property especially permeability and soil structure.

• Journal of Soil and Groundwater Environment
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• v.17 no.4
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• pp.19-26
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• 2012

The influence of operation time on electrokinetic restoration was investigated to remove salts from sulfate-accumulated greenhouse soil. Operation time is directly related to the process cost, therefore, we determined the relationship between operation time and removal of salts. Nitrate and sodium were removed almost completely within 2 weeks, chloride and calcium was removed in proportion to the operation time. Sulfate was accumulated at the center of anode and cathode. The soil electrical conductivity (EC), an indicator for soil salinity, showed similar shape with the residual sulfate after electrokinetic treatment. The soil EC was not changed after 2 weeks, however, the energy consumption increased with operation time. Based on the experimental results, most salts except sulfate were removed within 2 weeks, but sulfate was not removed during same time period. For the further removal of sulfate, longer operation time is in need.