• 한국토양비료학회지
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• 제34권6호
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• pp.407-412
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• 2001

본 연구는 건답직파재배에서 완효성질소비료인 Latex coated urea(LCU)와 Meister10(MS10)의 효과를 구명하기 위해 포장시험으로 조생종인 중화벼를 공시품종으로하여 무질소구, 요소구, LCU구, MS구로 처리하여 벼의 생육, 수량 및 수량구성요소, 질소흡수량 및 이용율, 시험전후 토양의 화학적특성을 조사한 결과는 다음과 같다. 초장과 분얼수는 요소구보다 LCU구와 MS10구가 높았고, MS10구는 LCU구보다 초장과 분얼수가 높았다. 입모수는 요소구, LCU구, MS10구간에 통계적 유의성이 없었다. 간장은 요소구 보다 LCU구와 MS10구가 높았으나, 수장은 요소구, LCU구, MS10구간에 통계적 유의성이 없었다. $m^2$당 수수는 MS10구>LCU구>요소구 순이었다. 수량은 MS10구>LCU구>요소구 순이었다. 수확기의 질소흡수량과 질소이용율은 MS10구>LCU구>요소구 순이었다. 시험후 토양에서는 시험전 토양의 화학성은 질소함량에는 변화가 없었으나, pH, 인산 및 규산 함량이 다소 낮아졌다.

• 한국초지조사료학회지
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• 제10권3호
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• pp.158-163
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• 1990

This experiment was to study the effect of pure mineral nitrogen fertilizing on seasonal distribution of dry matter yield and the advisable mineral nitrogen amounts on grassland. The results were as follows: 1. With longer regrowth periods the absolute dry matter yields and the nitrogen-efficiences due to nitrogen fertilizing increased substantially, whereas the quality declined at the relatively lesser cutting frequencies. 2. The first cut at 3-cut regimes, the first and fourth cut at 4-cut regimes, and the second and last cut at 5-and 6-cut regimes showed the highest nitrogen-efficiency, respectively. 3. By the sigmaformed process of production curve the most efficient mineral N-dressing rate per ha and cut was calculated: 42-56kg N on the 3-cut areas, 39-55kg N on the 4-cut areas, 38-47kg N on the 5-cut areas and 35-48kg N/ha/cut on the &cut areas. 4. In dependence on site and kind of calculation the economical borders were reached with the following dressings of mineral N/ha/cut: 90-100kg on the 3-cut areas, 70-100kg on the 4-cut areas and 50- 90kg on the 5-and 6-cut areas.

• 한국작물학회지
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• 제49권3호
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• pp.194-198
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• 2004

본 연구는 남서해안 간척지에서 토양 염농도(저염; 0.1%, 중염; 0.3∼0.4%)별로 쌀 품질 향상을 위한 적정 질소 시비량을 구명하기 위하여 시험한 결과를 요약하면 다음과 같다. 1.유추분화기의 초장은 질소 시비량이 많을수록 컸고, 토양염농도간에는 저염 토양에서 켰다. 2. 출수기는 저염 토양에서는 표준비인 N20kg/10a에 비해 N8-N16kg/10a까지는 같았으나 N24kg/10a에서는 1일 늦었고, 중염 토양에서는 N8-N16kg/10a 까지는 1일이 삘랐고 N24kg/10a에서는 같았으며, 토양 염농도간에는 저염 토양에서보다 중염 토양에서 4일 정도 늦었다. 3. 질소시비량이 많을수록 간장이 크고, 포장도복이 심했다. 4. 저염 토양에서 질소시비량이 많을수록 $\textrm{m}^2$ 당 립수는 많았으나 등숙비율이 낮아져 발 수량은 N12kg/10a이상에서는 유의차가 없었으며, N12kg/10a이하에서 현미의 완전미율이 높고 단백질 함량이 낮았다. 5.중염 토양에서는 질소시비량이 많을수록 $\textrm{m}^2$ 당 립수가 많고 등숙비율이 비슷하여 발 수량은 질소시비량이 많을수록 높았으나 N20kg/10a 이상에서는 유의차가 없었고, 현미의 완전미율과 단백질함량은 질소시비량간에 비슷하였다. 따라서 남서해안 간척지에서 쌀 수량 및 미질 등을 고려해 볼 때, 저염 토양에서는 N12kg/10a, 중염 토양에서는 N20kg/10a이 적당할 것으로 생각된다

• 한국토양비료학회지
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• 제44권4호
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• pp.597-599
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• 2011

This study was conducted to find out the optimum nitrogen application rate for the stable production of rape in the newly reclaimed land located at Gangwhal region of Saemangum reclaimed land in which the soil is sandy loam (Munpo series). There were five treatments of nitrogen fertilization from zero to 60% increment based on the standard fertilization of $150kg\;ha^{-1}$. The growth of rape (Sunmang) was not affected by salt content while soil salinity was increased at blossoming season of rape. Compared to yield of standard fertilization the yield and the content of oleic acid of rape were increased by 4~26% with the increasing additional nitrogen fertilizer. The results obtained from the growth and yield of rape in this study indicated that it was possible to cultivate rape in a newly reclaimed land if soil salinity was kept below $3dS\;m^{-1}$.

• 한국초지조사료학회지
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• 제15권4호
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• pp.231-237
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• 1995

The objective of this study is to obtain the basic data for investigating the effects of organic reserves on winter survival or regrowth yield. Forage rape (Brassica napus L.) was sown by three seeding densities of 5, 15 and 25cm interval among plants on Sep. 1, 1994. Field-grown plants were sampled on the before wintering (Dec. 4) and on the wintering period (Jan. 16) to analyze the nitrogen and non-structural cahohydrate reserves. The rate of winter survival and regrowth yield were also measured in the spring of next year. The dry matter yields from the plots of 5, 15 and 25cm seeding interval were 1,270, 1.01 9 and 1,062 kg/lOa respectively, on the before wintering. The similar pattern wa5 observed in the crude protein yields affected by seeding density. On the before wintering, both of nitrogen and starch contents per plant significantly increased as the seeding density was lowered. Starch content was relatively higher than that of nitrogen in all plots. On the wintering period, the contents of nitrogen reserves were 6.5, 41.2 and 121.7 mglplant, those of starch reserves were 1.0, 5.4 and 185.1 mg/plant, respectively, in the plots of 5, 15 and 25cm seeding interval. Nitrogen reserves on the wintering period increased while starch reserves highly decreased in all plots comparing to the before wintering. 'lhe rates of winter survival were 10.2, 20.6 and 37.1%, and regrowth yields were 76, 96 and 178 kgD.M/ IOa, respectively, in the plots of 5, 15 and 25cm seeding interval. These results cleariy showed that seeding density have a close influence on the level of nitrogen and non-structurd cahohydrate reserves, and that the rate of winter survival and regrowth yield were controlled by reserves level on the wintering period.

• 한국작물학회지
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• 제14권
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• pp.65-69
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• 1973

본시험은 대두성력재배의 일환으로 만파밀식재배에 있어서 알맞은 질소의 시용량을 구명하기 위하여 실시하였던바 그 결고를 요약하면 다음과 같다. 1) 발아기는 질소시용량의 차이에 따라 아무런 변이도 나타내지 않으나 개화기 및 성숙기는 질소의 시용량이 증가할수록 늦어지는 경향이었다. 2) 간장 및 절간장은 질소시용량이 증가함에 따라 길어졌으며 경경은 반대로 질소의 시용량이 증가함에 따라 가늘어 짐으로써 이들이 도복을 초래하는 원인이 되었다. 3) 주당협수는 질소의 시용량이 증가함에 따라 감소되었으며 1,000입중도 또한 같은 경향을 나타냈다. 4) 10a당 수량은 품종간에는 고도의 유의차가 인정되었으나 처리간에는 유의차가 인정되지 않았다. 그러나 조생종인 품종(충북백)은 극만파재배(7월5일 파종)인 경우도 10a당 질소의 시용량을 6kg 수준으로 증시함으로써 수량의 증가를 초래할 수 있었다.

• Journal of Animal Science and Technology
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• 제63권2호
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• pp.305-318
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• 2021

Alfalfa (Medicago sativa L.) is an important forage legume grown in Kansas, USA and its productivity with cool-season grasses however is unknown. The objective of this study was to determine the dry matter yield (DMY) and forage nutritive value of alfalfa-grass mixtures compared to those of alfalfa and grasses grown in monoculture with and without nitrogen fertilization. Three different alfalfa varieties were planted (reduced-lignin alfalfa, Roundup Ready, and conventional alfalfa) and two kinds of cool-season grasses (smooth brome, Bromus inermis Leyss, and tall fescue, Festuca arundinacea Schreb) were planted as a monoculture or in alfalfa-grass mixtures. Nitrogen fertilizer (urea) was applied at green-up at a rate of 56 kg/ha and after the second cutting at a rate of 56 kg/ha in 2016 and 2017, respectively. and control treatments received no nitrogen. DMY was significantly higher in monoculture alfalfa and alfalfa-grass mixtures than in grass monocultures. Between alfalfa monoculture and alfalfa-grass mixtures, no significant differences in DMY were found. For all treatments, nitrogen application significantly increased DMY compared to the control. In 2016 and 2017, the low-lignin alfalfa monoculture had the lowest acid detergent fiber (ADF) and the grass monocultures had the highest ADF. In 2016 and 2017, neutral detergent fiber (NDF) in smooth bromegrass and tall fescue was higher than in other species treatments. A low-lignin alfalfa monoculture had significantly lower NDF concentration compared to alfalfa-grass mixtures. When averaged over 2016 and 2017, relative feed value (RFV) was highest in low-lignin alfalfa and lowest in the grass monocultures. In both years, nitrogen fertilizer application did not affect nutritive values.

• 한국작물학회지
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• 제53권spc호
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• pp.72-77
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• 2008

This study was carried out to determine the response of the rice yield and grain quality by rice leaf folder (RLF, Cnaphalocrocis medinalis G.) and identify the damages caused by different transplanting dates, nitrogen amounts and chlorophyll amounts (SPAD value) of rice leaf. As the damage degree of RLF was getting severer, the ripened grain rate and 1000-grain weight were decreased and due to the increasing of chalky rice rate the rate of head rice was reduced. Therefore, the yield of head rice was decreased by 36% in heavily damaged rice plant. Among the physicochemical characteristics, protein content of rice grain was increased but amylose content was reduced, consequently, the palatability was deteriorated in heavily damaged rice by RLF. The degree of damage of RLF was getting serious as transplanting date was delayed and as the amount of nitrogen was increased. In the relationship between the SPAD value and the damage degree of RLF, as the SPAD value was increased by nitrogen fertilizing, the damage degree was also increased exponential functionally.

• 한국유기농업학회지
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• 제19권spc호
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• pp.153-156
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• 2011

Supplying rate of nitrogen at HV was 172.8 kg $ha^{-1}$, HV/B was 64.3 kg $ha^{-1}$ and B was 38.6 kg $ha^{-1}$. The Rice yield was 7.05 ton $ha^{-1}$ when the nitrogen supply was the largest with HV and 5.42 ton $ha^{-1}$ was produced on HV/B. The chemical characteristics of soil have lower pH and exchangeable cations(Ca and Mg) at B, HV and HV/B, rather than at CF because green manure was applied at the former step. However, the physical characteristics of the soil and the porosity showed different tendency which was that it was better at the green manure crops than CF. Nitrogen nutrient balance was showed the most balanced at CF and field of application of green manure crops were required the appropriate management if future crops would be cultivated because nitrogen nutrient could be exhausted or accumulated.

• 한국작물학회지
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• 제62권2호
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• pp.118-123
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• 2017

본 실험은 거대배 흑미 품종인 눈큰흑찰의 효과적인 재배를 위한 적정질소시비량과 적정재식밀도를 구명하고자 2013년~2015년에 밀양에서 실시하였다. 1. 질소시비량이 0 kg/10a에서 8 kg/10a까지 증가하면 주당수수와 수당립수가 증가하여 현미수량이 증가하였지만 8 kg/10a에서 12 kg/10a까지 증가하여도 수량의 변화는 없었다. 회귀분석을 통해 얻어진 눈큰흑찰의 최대현미수량을 위한 적정 질소시비량은 9.6 kg/10a였다. 2. 질소시비량이 0 kg/10a에서 8 kg/10a까지 증가하면 안토시아닌의 함량은 높아졌으나 12 kg/10a까지 처리하였을 때는 오히려 감소하였다. 회귀분석을 통해 얻어진 눈큰흑찰의 최대 안토시아닌 수량을 위한 적정 질소시비량은 10.6 kg/10a였다. 3. 재식밀도가 증가함에 따라 수수는 증가하고 수당립수는 감소하였는데 밀도 증가에 따른 수수의 증가치가 수당립수의 감소치보다 높아 $30{\times}12cm$의 높은 재식밀도에서 가장 높은 수량을 보였다. 4. 질소시비량 7 kg/10a 수준에서는 재식밀도 차이에 따른 안토시아닌 함량의 차이가 없었고 9, 12 kg/10a 수준에서는 밀도가 높아질수록 안토시아닌 함량이 높아져 $30{\times}12cm$ 수준에서 가장 안토시아닌 함량이 높았다. 현미수량과 안토시아닌 함량을 함께 고려한 안토시아닌 생산량은 질소시비량 9 kg/10a, 재식밀도 $30{\times}12cm$에서 69.1 g/10a로 가장 높았다.