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전(田)·답토양(畓土壤)의 유효인산(有效燐酸) 분석방법(分析方法) 비교(比較) 연구(硏究)
박백균,윤정희,호교순,Park, Baeg-Gyoon,Yoon, Jung-Hui,Ho, Qyo-Soon 한국토양비료학회 1998 한국토양비료학회지 Vol.31 No.1
토양(土壤)의 유효인산(有效燐酸) 분석방법(分析方法)에 있어서 우리나라 토양(土壤)에 적합(適合)한 인산(燐酸) 분석방법(分析方法)을 확립(確立)하고자 밭토양과 논토양에 각각 옥수수와 벼를 재배(栽培)하여 Lancaster법(法), Olsen법(法), Bray No.1, Bray No.2법(法), Mehlich II 법(法), Calcium lactate법(法) 등(等) 6개 분석방법(分析方法)을 사용한 토양중(土壤中) 유효인산함량(有效燐酸含量)과 식물체중(植物體中) 인산흡수량(燐酸吸收量)과의 관계를 비교 검토하였다. 1. 분석방법을 달리한 밭토양의 유효인산함량(有效燐酸含量)과 옥수수 식물체중(植物體中) 인산흡수량(燐酸吸收量)과의 관계(關係)는 모든 분석방법(分析方法)이 유의성(有意性) 있는 직선회귀(直線回歸) 관계(關係)를 나타내었고, 분석(分析) 방법별(方法別) 결정계수(決定係數)($R^2$) 크기는 Olsen-P $0.891^{**}$, Bray No. 2-P $0.880^{**}$, Lancaster-P $0.878^{**}$, Bray No.1-P $0.792^{**}$, Mehlich II-P $0.787^{**}$, Calcium lactate-P $0.596^{**}$이었다. 2. 논토양중 有效燐酸含量과 벼의 燐酸含量과의 關係에서 밭토양과 달리 Michaelis-Menten 式 ($Y=K_1X/(1+K_2X)$을 따랐으며 (Y, 벼의 燐酸吸收量, X ; 土壤 有效燐酸, K : 係數), 본 식에 따른 決定係數 ($R^2$)는 Lancaster-P $0.923^{**}$, Bray No.1-P $0.919^{**}$, Bray No.2-P $0.914^{**}$, Calcium lactate-P $0.769^{**}$, Olsen-P $0.712^{**}$, Mehlich II-P $0.607^{**}$이었다. To compare different methods for the determination of available soil P in the relationship between the soil P and plant uptake of P, rice and corn were cultivated in the pot filled with soils of different available P contents. The soils were taken from 20 rice fields and 20 upland soils. The available soil P were determined before the experiment by Olsen, Lancaster, Bray 1, Bray 2, Mehlich II and Calcium lactate methods and the correlations between the available soil P measured by different methods and the amount of P taken up by corn at 10 leaf stage and by rice at maximum tillering stage were investigated. In upland soils, the available P measured by all the methods was linearly regressed with high significance to the amount of P taken up by corn. The coefficients of determination($R^2$) in the regression equations ranged from 0.596(Calcium lactate method) to 0.891(Olsen method). In rice soils, the soil available P did not regressed by first-order to the amount of P taken up by rice plant, while Michaelis-Menten equation better explained the relationship between the two parameters. In the Michaelis-Menten equation the coefficients of determination for each analytical method ranged from 0.607(Mehlich II method) to 0.923(Lancaster method). Based upon these observations it is concluded that for testing of available P for corn soils Olsen, Bray 2 and Lancaster methods are equally superior to other methods. For rice soils Lancaster, Bray 1, and Bray 2 methods are better than others.
퇴비(堆肥) 시용(施用)이 미질특성(米質特性)에 미치는 영향(影響)
李龍煥 ( Lee Yong-hwan ),蘇奎鎬 ( So Kyu-ho ),黃光男 ( Hwang Kwang-nam ),胡敎純 ( Ho Qyo-soon ) 한국유기농업학회 1997 韓國有機農業學會誌 Vol.6 No.1
For the environmental protection, it is more desirable to use compost rather than chemical fertilizer. So in this paper, the effects of compost upon the rice qualiity were investigated with Hwajin Rice as the test variety. The rice quality and physicochemical characteristics were examined and the results are as follows. As to the rice quality, the rate of polished rice was high in the non-fertilizer and the compost plot, the degree of transparency was high in the order of the traditional, the compost+urea, the compost and the non-fertilizer plot. The amylose content (one of the physicochemical characteristies of the rice),the rate of Mg/K, and the adhesivity and the cohesion power (charateristies of texturogram which show the density of boiled rice) were also high in the compost polt. Among the amylogram characteristics, the gelatinization temperature was lowest in the compost plot ; the lowest and the highest degree of viscosity and the break down were also inclined to be higher in the compost plot than in the traditional plot. After the soil test, the components of available phosphorus, organic matters, calcium, magnesium, potassinm and silicate increased in the soil as compared with those before test.
유기농법(有機農法)에 관(關)한 연구(硏究) - I. 유기농법(有機農法) 답포장(畓圃場)에서의 절지동물상(節肢動物相) 조사(調査) -
李龍煥 ( Lee Yong Hwan ),高賢寬 ( Goh Hyun Gwan ),黃光男 ( Hwang Kwang Nan ),胡敎純 ( Ho Qyo Soon ) 한국유기농업학회 1998 韓國有機農業學會誌 Vol.6 No.2
Organically cultured rice fields were surveyed to compare the population density and the structure of microarthropod communities between chemically controlled and uncontrolled fields. In rice fields, microarthropod communities were also compared among four treatments based on different input of fertilizer : 1)No fertilizer, 2)Chemical fertilizer (N-P2O5-K20 = 11-7-5kg/10a). 3)Compost(5.000kg/10a). 4) complemented with chemical N. Richness index of microarthropod communities in rice fields was greater in the chemically uncontrolled field than controlled field. Within field, the compost plot had greater value of richness index for microarthropod communities than the non-fertilizer polt. A total of 9 aquatic insects species were identified in the water of organic farming rice field the population density was found to be higher in the compost plot than the other plot. The population of insect pests was found to be high in the late stage of plant whereas the population of insects was high in the early stage of rice plant.