• 한국동물학회:학술대회논문집
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• 한국동물학회 1995년도 한국생물과학협회 학술발표대회
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• pp.188.1-188
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• 1995

No Abstract, See Full Text

• The Korean Journal of Ecology
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• 제12권1호
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• pp.1-7
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• 1989

낙동강 하구 옥류등에 형성되어 있는 갈대, 천일사초 및 갯잔디 군락의 실소와 린의 동태를 조사하였다. 실소와 린의 흡수량 및 현존량은 식물군락의 물질생산과 단위 무게당 이들 무기영양소의 함량이 달랐다. 실소의 연 흡수량은 갈대, 천일사초, 갯잔디 군락에서 각각 224, 111 그리고 156 kg/ha이었고, 린의 연 흡수량은 각각 22, 29 그리고 21 kg/ha이었다. 염습지의 관속식물 군집은 다량의 질소와 인을 흡수하기 때문에 연안수의 당영양화를 일시적으로 경감시키는 역할을 할 수 있는 것으로 생각되었다.

• 한국토양비료학회지
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• 제21권4호
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• pp.455-461
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• 1988

질소고정력(窒素固定力)이 큰 두과작물(豆科作物)로 알려진 Sesbania를 Growth cabinet에서 Leonard-Jar법(法)으로 재배(栽培)한 시험결과(試驗結果)는 다음과 같다. 1. 근류균접종시(根瘤菌接種時) Sesbania의 부위별(部位別) 건물중(乾物重)은 경(莖)>엽(葉)>근(根)> Stem nodule > Root nodule순(順)으로 많으며 총건물중(總乾物重)은 근(根)+경근류균접종(莖根瘤菌接種)>근근류균(根根瘤菌) 접종(接種)> 무접종(無接種)으로 경(莖)에 근류균(根瘤菌) 접종효과(接種效果)가 인정(認定)되었다. 2. 질소고정력(窒素固定力)은 총건물중(總乾物重)과 같이 건물중(乾物重)이 많은 것이 질소고정력(窒素固定力)도 큰 경향(傾向)이며 뿌리외(外) 경(莖)에서도 질소고정력(窒素固定力)이 컸다. 3. 공기중(空氣中)에 $^{15}N$을 기준(基準)해서 자연(自然)에 존재(存在)하는 물질(物質)의 동위체(同位體)의 부위별(部位別) ${\delta}^{15}N$증가(增加)는 근(根)+경(莖)>근(根)> 무접종구(無接種區)의 순(順)이고 Root nodule 과 Stem nodule은 positive 근(根), 경(莖), 엽등(葉等)은 Negative이었다.

• 한국토양비료학회지
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• 제42권4호
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• pp.301-306
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• 2009

이 연구의 목적은 건강한 작물과 시들은 식물의 질소대사와 아스코리빈산 함량의 차이를 비교하는것에 있다. 시듬은 인공적으로 유도되었으며, 그방은 질소과다 시비 및 저칼륨 시비에 의한 것으로4개의 처리구를 두었다. 1N-1P-1K (control), 6N-1P-0K (0K), 6N-1P-0.5K (0.5K), and 6N-1P-2K (2K). 시듬 정도는 control, 0%; 2K, 10%; 0.5K, 40%; and 0K, 70%. 식물 생장에는 고질소 저 칼륨 처리구에서는 그리 큰 차이가 없었으며 질산태질소의 함량은 control 구와 비교하여 고 질소 처리구가 높았으며, 아스코리빈 산 함량은 고질소 처리구가 control구에 비하여 낮았음을 확인 할수 있었다.

• 한국지하수토양환경학회지:지하수토양환경
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• 제26권4호
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• pp.8-19
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• 2021

In this study, the evaluation standard for nitrate nitrogen contamination degree (WELCUP) was established using six factors that influence the groundwater quality in Jeju Island. To do this, weightings, ranges, and ratings were assigned for each factor and the relative possibility of nitrate nitrogen contamination degree was evaluated using WELCUP index for each well. As a result of calculating the WELCUP index using groundwater quality data of 5,112 wells in Jeju Island for 27 years (1993-2019), all 61 wells with the WELCUP index value higher than 100 are distributed in Daejung and Hangyung watershed with relatively large area of farmland in Jeju Island. In particular, as the ratio of private wells is more than 64%, it is necessary that systematic management is needed for private wells in terms of nitrate nitrogen contamination. Consequently, based on the results of applying the WELCUP evaluation standard, it is necessary to select the prioritization of nitrate nitrogen contamination pathways project for groundwater wells in Jeju Island.

• 한국작물학회지
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• 제45권4호
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• pp.272-275
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• 2000

Winter green manure crops including legume increase grain yield of subsequent crop and substitute N fertilizer requirement with organic-No Hairy vetch grows vigorously and can provide N-rich green manure for corn with its soil incorporation after wintering. But, grain yield of corn as succeeding crop would be reduced if its planting time is delayed until late spring. This experiment was carried out to find the proper incorporation time of hairy vetch green manure and planting time of subsequent corn in cropping system with winter hairy vetch(green manure)-summer corn. Hairy vetch was incorporated into soil at a ten-day interval between April 10 and May 10 and corn was planted at 5 days after each hairy vetch incorporation. Soil nitrate concentration on April 10 and 20 in hairy vetch plot was slightly lower than that at winter fallow. Above-ground dry matter and organic-N of hairy vetch increased linearly with delayed hairy vetch incorporation time from April 10 to May 10. Average dry matter and organic-N produced by hairy vetch were 5.7 ton/ha and 248 kgN/ha, respectively. Corn growth and yield decreased as delayed corn planting time after May in spite of increasing dry matter and N-yield of hairy vetch. Nitrogen concentration of corn grain, stalk and whole plant at harvest were the highest in May 5 planting, but total N-uptake of May 5 planting were not different from that of April 25 planting because of lower grain yield. It was concluded that the proper incorporation time of hairy vetch and corn planting time were April 20 and April 25, respectively, because grain yield was the highest and corn could use hairy vetch-N effectively to produce dry matter.

• BMB Reports
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• 제45권2호
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• pp.96-101
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• 2012

Urea-based nitrogen fertilizer was widely utilized in maize production, but transporters involved in urea uptake, translocation and cellular homeostasis have not been identified. Here, we isolated three maize aquapoin genes, ZmNIP2;1, ZmNIP2;4 and ZmTIP4;4, from a cDNA library by heterogous complementation of a urea uptake-defective yeast. ZmNIP2;1 and ZmNIP2;4 belonged to the nodulin 26-like intrinsic proteins (NIPs) localized at plasma membrane, and ZmTIP4;4 belonged to the tonoplast intrinsic protein (TIPs) at vacuolar membrane. Quantitative RT-PCR revealed that ZmNIP2;1 was expressed constitutively in various organs while ZmNIP2;4 and ZmTIP4;4 transcripts were abundant in reproductive organs and roots. Expression of ZmTIP4;4 was significantly increased in roots and expanded leaves under nitrogen starvation, while those of ZmNIP2;1 and ZmNIP2;4 remained unaffected. Functions of maize aquapoin genes in urea transport together with their distinct expression manners suggested that they might play diverse roles on urea uptake and translocation, or equilibrating urea concentration across tonoplast.

• 한국작물학회지
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• 제44권3호
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• pp.191-196
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• 1999

In rice-barley cropping systems, efficient utilization of barley straw is essential, both to improve the soil fertility and to conserve the environment. In order to identify the effects of barley straw mulch rates in rice cultivation, a rice cultivar, 'Gancheogbyeo', was directly seeded on a no-tillage field synchronized with barley harvesting with five barley straw mulch rates, i.e., 0, 2.5, 5.0, 7.5 and 10.0 ton h $a^{-1}$ and agronomic characters of rice and soil nitrogen were determined. The increasing of barley straw mulch rates. Dominant weed species, chestnut, occurred in large amounts in no mulching or lower mulch rates than in higher mulch rates. The content of N $H_4$$_{＋}$-N in soil applied with high barley straw mulch rates was lower during the month after seeding, and then it was higher at heading date, compared with lower mulch rates or no mulch plot. As the barley straw rate increased, maximum tillering stage was delayed, and plant height was reduced. Although the lodging of rice plants was seldom observed in all plots, the breaking strength of the culm was significantly higher in the mulch rate of 10.0 ton h $a^{-1}$ . With an increase of barley straw mulch rate, the effective tillering rate and spikelet number $m^{-2}$ decreased while ripened grain ratio increased. The rice grain yield was slightly decreased with an increase of barley straw mulch rate, although significant differences were not found all barley straw mulch rates. These results suggest that there is no significant yield loss although the total barley straw production, approximately 5.0 ton h $a^{-l}$ in the present study, apply in the paddy for the following rice cultivation by no-tillage direct seeding.ect seeding.

• 한국초지조사료학회지
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• 제16권3호
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• pp.199-207
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• 1996

This experiment was canied out to determine the effects of seeding method and seeding ratio in mixed cropping of forage rye and red clover on dry matter yield, nutritional yield and chemical characteristics of soil. The main treatment was two seeding methods(drilling and broadcasting) and the sub treatment was six seeding ratios between rye and red clover(T1; 150kg : 0 kg/ha, T2; 120 : 3, T3; 90 : 6, T4; 60 : 9, T5; 30 : 12, T6; 0 : 15). The experiment was performed at the College of Natural Science of Kon-Kuk University in Chungju in 1992. The results were summarized as follows; 1. Protein content was increased by increasing the seeding ratio of red clover, but content of NDF and ADF were decreased. 2. The seeding method did not affects significantly the dry matter yield, but broadcasting showed higher dry matter yield than drilling in the same seeding ratio. Especially, T3 of broadcasting was the highest yield of 13, 172 kg/ha The T3 of broadcasting and T4 of drilling showed hlghly crude protein yield of 1, 268 kgha and 1, 252 kg/ha, respectively. 3. Comparing the each seeding ratio of two seeding method, total nitrogen yield of shoot and root of drilling were higher than broadcasting. Especially, T2 and T4 of drilling were the highest in total nitrogen yield. 4. There were more increase in organic matter and nitrogen contents but decrease in K, Ca of soil by increasing the seeding ratio of red clover than soil before experiment. In the seeding methods, broadcasting was an effect of soil improvement.

• 한국토양비료학회지
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• 제36권2호
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• pp.92-103
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• 2003

Research and technological advances in the field of remote sensing have greatly enhanced the ability to detect and quantify physical and biological stresses that affect the productivity of agricultural crops. Reflectance in specific visible and near-infrared regions of the electromagnetic spectrum have proved useful in detection of nutrient deficiencies. Especially crop canopy sensors as a ground remote sensing measure the amount of light reflected from nearby surfaces such as leaf tissue or soil and is in contrast to aircraft or satellite platforms that generate photographs or various types of digital images. Multi-spectral vegetation indices derived from crop canopy reflectance in relatively wide wave band can be used to monitor the growth response of plants in relation to environmental factors. The normalized difference vegetation index (NDVI), where NDVI = (NIR-Red)/(NIR+Red), was originally proposed as a means of estimating green biomass. The basis of this relationship is the strong absorption (low reflectance) of red light by chlorophyll and low absorption (high reflectance and transmittance) in the near infrared (NIR) by green leaves. Thereafter many researchers have proposed the other indices for assessing crop vegetation due to confounding soil background effects in the measurement. The green normalized difference vegetation index (GNDVI), where the green band is substituted for the red band in the NDVI equation, was proved to be more useful for assessing canopy variation in green crop biomass related to nitrogen fertility in soils. Consequently ground remote sensing as a non destructive real-time assessment of nitrogen status in plant was thought to be useful tool for site specific crop nitrogen management providing both spatial and temporal information.