Kim, Hong-Lim;Weon, Hang-Yeon;Sohn, Bo-Kyun;Choi, Young-Hah;Kwack, Young-Bum
Korean Journal of Soil Science and Fertilizer
/
v.42
no.5
/
pp.341-347
/
2009
Soil microbial community has been changed after the treatment of anaerobic fermentation using wheat bran or rice bran was applied to the soil. In the dilution plate technique, the number of anaerobic bacteria and fungi was higher in rice bran-treated soil than in non and wheat bran-treated soil, but of yeast was higher in wheat bran-treated soil than in non and rice bran-treated soil. Specially, the fungi were not detected in the wheat bran-treated soil. Identified by 16S rDNA sequencing, the number of aerobic bacteria was similar in all treatments, the dominant bacteria was the genus Bacillus. In the phospholipid fatty acid (PLFA) technique, both Gram-positive and Gram-negative bacteria change slightly in all treatments for 20 days of fermentation process but, after 20day, increased rapidly in wheat or rice bran-treated soil. In conclusion, the microbial communities structure was dramatically changed after the treatment of wheat or rice bran to soil.
Kim, Jin-Ho;Lee, Jong-Sik;Kim, Bok-Young;Hong, Seung-Gil;Ahn, Seung-Ku
Korean Journal of Environmental Agriculture
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v.18
no.2
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pp.148-153
/
1999
We conducted this survey to find out the quality of ground water used for agriculture. Water samples mainly collected from plastic film houses which were located at Yongin City, Pyungtaek City, Hwasung Kun and Suwon City in Kyonggi Province. We measured EC, COD, ammonium, nitrate, sulfate, chlorite etc., and sampled three times in 1998. According to our survey, the ground water was suitable for irrigation purpose, but nitrate concentrations in ground water used in the intensive plastic film houses were high enough to require a special consideration or. the water and fertilizing management. On occasion of Pyungtaek, these results showed us specific. There are many differences among regions but aren't among periods on the part of nitrate concentrations. We found ground water quaky got worse as EC and nitrate value were going up. And there was high correlation between them.
This study was conducted to estimate the optimum application rate of fertilizer N based on $NO_3-N$ concentration in soils for tomato (Lycopersicon esculentum Mill.) cultivation in plastic film house. Tomato plants were cultivated with and without fertilizer in twelve soils which have different concentrations of $NO_3-N$ ranging from 46 to $344mg\;kg^{-1}$. Dry weight (DW) of above-ground part of tomato with no fertilizer ranged from 28.9 to $112.5g\;plant^{-1}$, depending on N-supplying capability of soils. The soil $NO_3-N$ was positively correlated with DW ($r=0.83^{**}$) and N uptake ($r=0.78^{**}$) by tomatoes in no fertilizer treatment, and negatively correlated with fertilizer effciencies resulted from the differences of DW and N uptake between fertilized and non-fertilized plot. The relationships between soil $NO_3-N$ concentration and DW, N uptake, and fertilizer efficiency were analyzed to determine the critical levels of soil $NO_3-N$ for tomato cultivation. The limit critical levels of soil $NO_3-N$ were estimated to be more than $280mg\;kg^{-1}$ for no application of fertilizer N and to be less than $50mg\;kg^{-1}$ for recommended application of fertilizer N. These critical levels of soil $NO_3-N$ were nearly the same as those calculated from regression equation between electrical conductivity(EC) and soil nitrate for critical levels of EC in recommendation equation of fertilizer N for tomato under the plastic film house by NationaI Institute of Agricultural Science and Technology. Consequently, the optimal application rate of ferdilizer N for tomato cultivation in the soils containing $NO_3-N$ concentration between $280mg\;kg^{-1}$ and $50mg\;kg^{-1}$ was estimated by the equation Y = -0.4348X+121.74, where Y is the percent(%) to the recommended application rate of N fertilizer and X is the soil $NO_3-N$ concentration ($mg\;kg^{-1}$).
This study was conducted to investigate changes in inorganic phosphorus fractions in phosphorus accumulated plastic film house soils under cropping condition. Pot experiment was conducted with surface soils taken from plastic film house fields cultivated for 3, 8 and 16 years. Phosphorus fertilizer was applied at the rates of 0 (P0), $100kg\;ha^{-1}$ (recommended application rate. P1) and $200kg\;ha^{-1}$ (P2) as fused phosphate. Crops were grown sequentially in the order of corn-Chinese cabbage-Chinese cabbage-corn for 3 years. The content of easily soluble-P fraction was decreased with cropping. There were significantly positive relationship not only between the contents of easily soluble-P and the amounts of soil available P ($r=0.839^{**}{\sim}0.952^{**}$ for Bray-1 P, $r=0.895^{**}{\sim}0.967^{**}$ for Lancaster P, and $r=0.491^{**}{\sim}0.821^{**}$ for Olsen P), but also between the amounts of P absorbed by plants and the amounts of easily soluble P decreased ($r=0.644^{**}{\sim}0.822^{**}$). The decrease of easily soluble-P during cropping period could be described by a first-order reaction. The number of cropping times needed to decrease the content of easily soluble-P to an index level of $0.2mg\;kg^{-1}$, which is commonly reported as the desired concentration for soil P, was predicted in the range of 26~33 cropping times by using the equations. Regardless of P fertilization, the proportion of Al-P to total P was little varied during cropping period, but the proportion of Fe-P to total P increased with cropping. Although the content of Ca-P was high before cropping, the proportion of Ca-P to total P was increased with cropping. The proportion of reductant soluble-P to total P was little varied for P fertilizer treatment but was increased for no P fertilizer treatment. The residual-P was decreased during cropping period due to the absorption by crops and the conversion to other inorganic P fractions.
This study was conducted to get the basic information for absorb enhancement of accumulated soil nutrients in plastic film house. The grain sorghum (Sorghum bicolor L.) was sowing in plastic film house which soil nutrient accumulated moderately and was cutting at major growth period of sorghum. We were analyzed the regrowth pattern, biomass due to cutting time and amount of plant nutrient of grain sorghum. The obtained results were as follows. The heading date after cutting of sorghum in plastic film house was came to about 35 days. The accumulated of plant height were the longest as 379.4 cm in cutting at milk stage. The total biomass of sorghum in cutting at heading stage was 1.73 ton $10a^{-1}$ in cutting at heading stage. The high grain yields were produced with non-cutting and cutting at 10 leaves stage as 75~113 kg $10a^{-1}$ but the lowest grain yields were the cutting plots at booting stage as below 24 kg $10a^{-1}$. The content of nutrient in sorghum plant was low as progress of growth. The concentrations in aboveground sorghum due to plant parts was in order to leaves > panicle > stalk. The nitrogen content of sorghum was 0.6~0.7% in stalk, 1.5~1.6% in panicle and 1.8~2.3% in leaves. The amount of nutrient absorbed in sorghum was 4.2 kg $10a^{-1}$ in nitrogen, 1.7 kg $10a^{-1}$ phosphorus and 7.7 kg $10a^{-1}$ in potassium and the absorbing different by cutting time in order to booting > non-cutting > panicle formation ${\geq}$ milk ripe > 10 leaves stage.
Pot experiments were conducted from 1999 to 2001 to compare the different methods of available phosphorus (P) for estimation of biomass and P uptake by tomato and cucumber grown on different soils (25 soils for tomato and 8 soils for cucumber cultivation) collected from plastic film house of Chungbuk area. Supplementary experiment was conducted to estimate the relationship among several extraction methods of available P such as P adsorption, water extractable-P, Lancaster-P, Olsen-P, Bray No 1 and No 2-P, and Mehlich 1 and 3-P for a total of 71 soils that included 33 soils collected for tomato and cucumber cultivation and 38 soils taken from other sites of plastic film house. All the extraction methods of available phosphorus except P adsorption were mutually positive correlated with r ranging from 0.81 to 0.96 while the correlation coefficient between P adsorption and other methods ranged from -0.57 to -0.80. Phosphorus uptake by tomato plant applied with no fertilizer was significantly correlated with the available P extracted by different methods except P adsorption in all the experiments showing positive correlation coefficients from 0.49 to 0.76 in April, 1999, 0.53 to 0.71 in April, 2000, and 0.59 to 0.68 in October, 2000. Consequently relative amount of P uptake by tomato plant for all the experiments also significantly correlated with available P in soils showing correlation coefficients of r=0.64~0.73 (P<0.0000001) in the order of Mehlich 1-P > Mehlich 3-P > Lancaster-P. For tomato, critical concentrations of available P in soils estimated by Cate and Nelson split method were $1700mg\;kg^{-1}$ for Mehlich 3-P, $1,050mg\;kg^{-1}$ for Mehlich 1-P, and $95mg\;kg^{-1}$ for water extractable P. Also P uptake by cucumber plant was significantly correlated with Olsen-P, water extractable P, and Bray No 2-P with r value of 0.62, 0.59, and 0.51, respectively, in soils of no fertilization.
Kim, Dae-Su;Yang, Jae E.;Ok, Yong-Sik;Yoo, Kyung-Yoal
Korean Journal of Soil Science and Fertilizer
/
v.39
no.2
/
pp.65-72
/
2006
Objective of this research was to remove the accumulated salts in the plastic film house soils by installing the perforated PVC (${\phi}10cm$) underdrainage pipes at 50 cm depth of soils with cultivating vegetables. Efficiency of the underdrainage pipes was assessed based on the changes of soil chemical properties such as pH, EC, and cations, and growth and yield parameters of the vegetables between the two treatments; the control and the underdrainage pipe treatments. The EC of the underdrainage pipes installed soils after two growing seasons were in the ranges of $1.42-2.88dS\;m^{-1}$ but those of the control were in the ranges of $3.86-4.53dS\;m^{-1}$, indication the underdrainage pipes effectively removed the accumulated salts in soils. The pHs of the control soils and the underdrainage pipe installed soil were in the ranges of 7.2-7.5 and 6.9-7.3, respectively. There was a significant correlation between pH and cation exchange capacity (CEC) of the soils ($CEC=17.107{\times}pH-106.2$, $r^2=0.759$, P < 0.05). The ECs of the soils at different depths were compared between the two treatments after cultivating vegetables with lettuce-lettuce-garland chrysanthemum rotation systems. The ECs of the control soils at depths of 0-10, 10-20, 20-30, 30-40, and 40-50 cm were 3.45, 3.47, 3.03, 2.03, and $2.28dS\;m^{-1}$, respectively, with decreasing with soil depths. On the other hand, the respective ECs of the underdrainage pipes installed soils were 2.43, 2.52, 2.28, 4.00, and $4.23dS\;m^{-1}$ with increasing with soil depths. This might be derived from the salts moved downward with the draining water into the subsoil. The order of cations moved downward was Mg > Ca > K, based on the ratios of cations at specific depth over those at the surface soil. The survival rates of lettuce after 15 days of transplanting in the underdrainage pipe installed soils were 98.2% as compared to 86.6% of the control. The underdrainage pipe treatment also increased the diameter of the lettuce stalk from 12.9mm of the control to 13.7mm. Overall results demonstrated that the installment of the underdrainage pipes in the subsoils of the salt accumulated plastic film house soil effectively removed the salts by leaching downward,resulting in lowering soil EC and enhancing the growth and yield of vegetables.
Salt accumulation in the plastic film house soils under continuous cultivation condition causes problems such as salt damages to plants, nitrate accumulation in vegetables, groundwater contamination, etc. due to excess application of fertilizers. Objective of this research was to find an optimum adsorbent to reduce salt concentration in the soil solution of plastic film house soils, where crop injuries have been observed due to the salt accumulation. The soils were significantly high in available P $(1,431{\sim}6,516mg\;kg^{-1}),\;NO_3-N\;(117.60{\sim}395.73mg\;kg^{-1})$, exchangeable Ca $(4.06{\sim}11.07\;cmol_c\;kg^{-1})$ and Mg $(2.59{\sim}18.76\;cmol_c\;kg^{-1})$, as compared to those of the average upland soils in Korea. Soils were treated with each of adsorbent such as ion-exchange resin, zeolite, rice bran, etc. at 2% level and prepared into saturated-paste samples. After equilibrium, soil solution was vacuum-extracted from the soil and measured for changes of the pH, EC, and concentrations of $Ca^{2+},\;Mg^{2+},\;K^+,\;Na^+,\;{NH_4}^+,\;{PO_4}^{3-}\;and\;{NO_3}^-$. Rice bran effectively removed ${PO_4}^{3-}\;and\;{NO_3}^-$ in the soil solution up to 100%. Efficiency was decreased in the orders of rice bran > ion-exchange resin > zeolite. Removal efficiencies of zeolite and ion-exchange resin for $Ca^{2+}$ were ranged from 1 to 65% and from 7 to 61%, respectively. Ion-exchange resin was also effective for removing $Mg^{2+},\;K^+,\;Na^+,\;and\;{NH_4}^+$. Overall results demonstrated that rice bran and ion-exchange resin could be applicable for salt accumulated soil to remove the respective anion and cation.
Kim, Hong-Lim;Sohn, Bo-Kyun;Jung, Kang-Ho;Kang, Youn-Ku
Korean Journal of Soil Science and Fertilizer
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v.39
no.6
/
pp.366-371
/
2006
This study was done to assess the physical and chemical properties after anaerobic fermentation treatment which use rice bran or wheat bran in plastic film house soil. The results which investigates the change of soil physical property after treatment 150 days showed a dramatic difference. The physical properties of control soil were the bulk density $1.46Mg\;m^{-3}$, hardness $2.30Kg\;cm^{-3}$, hydraulic conductivity $4.8cm\;hr^{-1}$, water stable aggregate(>0.5mm) 6.7%. Of the soil which treatment the rice bran in comparison to control soil, bulk density and hardness was diminished 12% and 58%, respectively. hydraulic conductivity and water stable aggregate(>0.5mm) were increased 4.5 and 5.2 fold, respectively. And, in the soil which treatment the wheat bran, bulk density and hardness was diminished 14% and 67%, respectively. Hydraulic conductivity and water stable aggregate(>0.5mm) were increased 6.3 and 6.5 fold, respectively. $NO_3-N$ contents of the soil which treated the rice bran or wheat bran after treatment 20 days were diminished 98% in comparison to control soil. The decrease of $NO_3-N$ contents in the soil was investigated with the fact that it is caused by with increase of the soil-microbial biomass. EC of the soil which treated the rice bran were $1.48dS\;m^{-1}$ which was diminished 58% in comparison to control soil. That of soil which treated the wheat bran was increased $3.65dS\;m^{-1}$ in the early stage because of acetic and butyric acid. But it was reduced as under $2.0dS\;m^{-1}$ after treatment 30 days. As the conclusion the anaerobic fermentation treatment with rice or wheat bran was effective to the improvement of soil physical and salt accumulation of the plastic film house soil.
This study was conducted to investigate the effects of tile drain on Physicochemical properties and crop productivity of soils under plastic film house for three years (1999 - 2001). Tiles (${\Phi}100mm$ PVC pipe) were established at 50-60 cm depth with 1 m, 2 m, and 3 m intervals in Gangseo silt loam soil under 2W-type plastic film house. Cropping system was a pumpkin-pumpkin in the first year, a cucumber-spinach-crown daisy-spinach-young radish in the second year, and a green red pepper-tomato-spinach in last year, with conventional fertilization and drip or furrow irrigation by groundwater pumping. Bulk density and soil hardness of plot with tile drain were lower than those of control (plot without tile drain). Soil water content was also lower in tile drain plot than in control regardless of soil depth, and decreased at narrower interval and longer distance from tile in the same plot, thus suggesting that water flow and density of tile drain plot was higher than those of control. Rhizosphere of spinach, a final crop of third year, was expanded more than 2 cm due probably to improvement of soil physical properties caused by tiles establishment. Electrical conductivity (EC) of topsoil decreased from $1.22dS\;m^{-1}$ to $0.82dS\;m^{-1}$ by tile drain system, and the extent of EC decrease was different with season: higher in spring and lower in summer and autumn. The $NO_{3^-}-N$ concentration in topsoil decreased, from $200mg\;kg^{-1}$ to $39mg\;kg^{-1}$. The effect of tile drain on crop yield varied with crops. Average crop productivity obtained in tile drain plot than that of control crop: 18.2% in 2 m interval, 14.2% in 3 m interval, but lower 0.2% in 1 m interval.
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