• Journal of Plant Biology
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• 제14권4호
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• pp.5-13
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• 1971

Pot and paddy field tests were conducted to study red discoloration of rice var. IR 667 leaves with reference to the leading Korean native variety Jinhung and Paldal, with the following results: 1. Minor elements such as Mn, Fe, B, Al, Ca and Si had no influence on the discoloration, but a supply of various soluble nitrogen compounds completely restricted it. The more prosperous the growth of IR 667 with nitrogen, the more severe the discoloration appears when nitrogen absorptin becomes limited. 2. Chlorotic pigments extracted from both IR 667 and Jinhung were compared spectrophotometrically, and found to have different spectral peaks. IR 667 had peak closer to red than Jinhung, indicating the characteristic of the variety. IR 667 was observed to be more sensitive to nitrogen deficiency than Jinhung or the other japonica variety. 3. It was concluded that all the factors limiting nitrogen supply for IR 667 growth, such as low nitrogen application, restriction of root respiration (low temperature, poor drainage, toxic gases or substances in the root zone, etc.) and pest injuries, would result in the appearance of the so-called red discoloration, because of the reduction in nitrogen uptake. Since, the discoloration of IR 667 is varietal characteristic when grown in Korea, control of it may be beneficial cultural practice in increasing grain yield, although the increased succeptibility to pests and a drop in the rate of maturity due to relatively high nitrogen level in the leaves may result in an unexpected drop in yield. It is anticipated that further exploration conducted from practical point of view will establish the relatioknships between the extent of red discoloration, nitrogen availability and grain yield in IR 667.

• 한국작물학회지
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• 제44권1호
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• pp.1-3
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• 1999

This study was carried out to determine the effects on rice growth, yields and soil improvement under the different nitrogen levels in machine-transplanted rice after plowing at the fruiting stage of milk vetch. The fresh weight of milk vetch at plowing time was 20.95 ton/ha. In dry weight, T-N and C/N were 1.58%, 21.8%, respectively. Organic matter, total nitrogen and exchangeable calcium of soil after the experiment in the plot of milk vetch were higher than those before the experiment. Leaf area and dry weight of rice plants at heading date increased as nitrogen level increased. The number of panicle and spikelets per $\textrm{m}^2$were not different except for the 110 kg/ha nitrogen level plot with milk vetch. Brown rice yield ranged from 5.45 to 6.08 ton/ha, in creasing with increased nitrogen level. So the yield increased by 1% at 77 kg/ha nitrogen level, 7% at 110 kg/ha nitrogen level plot with milk vetch compared with conventional level (rice straw 5.4 ton/ha and nitrogen 110 kg/ha).

• 한국작물학회지
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• 제35권6호
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• pp.497-503
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• 1990

질소와 가리 시용량이 버어리종 잎담배(1988년; Burley 21, 1989년 ; Burley 21과 KB 101)의 생육, 수량 및 품질에 미치는 영향을 알아보기 위하여 질소 3수준(1988년 ; 17.5, 22.75, 28.0kg/10a, 1989년 ; 12.5, 17.5, 22.5kg/10a), 가리 3수준(1988년 ; 17.5, 35.0, 52.5kg/10a, 1989년 ; 25.0, 35.0, 45.0kg/10a)을 두어 포장에서 시험한 바, 그 결과를 요약하면 다음과 같다. 1. 적심기 생육에 미치는 질소 시용량의 영향은 년차간 변이가 큰 것으로 나타났으며 가리시용량은 적심기 생육에 별다른 영향을 미치지 않았다. 2. 질소나 가리 시용량이 생육기간중의 엽중 질소함량에는 비교적 큰 영향을 미쳤으나 가리함량에 미치는 영향은 비교적 작았다. 3. Burley 21에 비하여 KB 101이 다수성이었으며, 질소감비상태에서의 생산성도 높았다. 4. 질소를 22.75kg/10a까지 시용할 때는 수량과 품질이 높아졌으나, 그 이상 시용할때는 수량은 증가되지 않고 품질은 낮아졌다. 5. 가리시용량이나 가리/질소 시용비에 따른 수량, 품질 차이는 크지 않았으나, 가리/질소 시용비가 작을 때는 품질이 다소 낮아졌다 6. 질소시용량이 22.75kg/10a을 초과할 때, 잎담배 수량 및 품질면에서 유리한 점은 없었으며, 가리시용량은 35.0kg/10a이면 충분하며 그 이하로의 감비도 여지가 있을 것으로 생각된다.

• 한국작물학회지
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• 제61권2호
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• pp.79-86
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• 2016

본 연구는 질소시비량과 재식거리 차이에 따른 신농흑찰의 미질 및 수량 차이를 분석하여 안토시아닌 함량에 변화가 없으면서 최고 수량을 생산할 수 있는 적정 재배기술의 자료를 얻고자 수행하였고 그 결과는 다음과 같다. 1. 출수기는 70주 및 80주 시험구+15 kg 조합에서 8월 22일로 동일하였고 다른 조합에서는 8월 21일로 조사되었다. 출수 후 40일에 경수는 70주 시험구+13 kg시비량 조합에서 가장 높았다. 2. 도복지수는 시비량이 증가할수록 증가하였지만 모든 처리구에서 포장도폭은 발생하지 않았고 병해충도 발생하지 않았다. 3. 질소함량은 잎>종자>줄기 순으로 증가하였고, 줄기 및 잎의 질소함량은 80주 시험구의 평균이 70주보다 조금 높았지만 종자의 질소함량은 70주 시험구가 80주보다 높았다. 종자의 최대 질소 함량은 70주+13 kg 조합에서부터 통계적으로 유의성 있는 증가를 보였다. 4. 수당립수는 70주+13 kg 시비량 조합에서 가장 높았고, 등숙률은 80주+13 kg 시비량 조합에서 가장 높았다. 정현비율은 70주+15 kg 시비량 조합에서 가장 높았고, 천립중은 80주+15 kg 시비량 조합에서 가장 높았으나 통계적으로 큰 차이는 없었다. 5. 현미 수량은 70주 시험구의 평균이 80주 시험구보다 높았고, 70주+13 kg 시비량 조합에서 다른 처리구보다 가장 높은 수량을 보였다. 회귀분석에 의해 최대 수량은 14.67 kg/10a로 추정되었다. 6. 관능평가 결과 착색정도는 70주 시험구가 80주보다 높았지만 C3G는 80주가 더 높았다. 완전착색립 수량은 70주+13 kg 시비량에서 가장 높았다. 7. 그러므로 현미수량, C3G 함량 및 100% 착색립 수량을 기준으로 신농흑찰 최고수량을 위한 최적 질소 시비량은 13~14 kg/10a까지 높일 필요가 있을 것으로 판단된다.

• 한국식품저장유통학회지
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• 제5권2호
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• pp.123-126
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• 1998

This study was carried out investigate to optimum levels of nitrogen and phosphate fertilizer to get a higher yield and a quality of an onion(Allium Cepa L.) from 1993 to 1994. Three fertilizer levels were applied with 120, 240 and 360kg/ha of nitrogen and 100, 200 and 300kg/ha of P2O5 during the onion growing season. After harvesting the onion, it was storaged at given deposit. The growth and yield of the onion were better at the fertilizer levels of both 240 and 360kg/ha of nitrogen and of both 200 and 300kg/ha of P2O5 than at the level of 120kg/ha in nitrogen and 100kg/ha of P2O5. The content of total nitrogen and P2O5 in plant was decreased with reduced application levels of nitrogen and phosphate fertilizer. The rotting rate was higher at the levels of both 360kg/ha in nitrogen and 300kg/ha in P2O5 than the other treatment during the storage period. The sprouting rate tended to be high at 240kg/ha of nitrogen and 100kg/ha of P2O5.

• 한국연초학회지
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• 제5권2호
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• pp.3-7
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• 1983

Three levels of nitrogen, phosphate and potassium were applied to tobacco for the establishment of the optimum rate of the fertilizers for yield and quality. 1 . The rate increment of nitrogen and potassium increased tobacco growth, but phosphate were non - significant between rate. 2. The contents of total-nitrogen and total-alkaloid in the leaf were increased, with the increase of nitrogen rate while the effect of phosphate and potassium were negligible. 3. The yield and quality of the tobacco were increased with the increasing rate of nitrogen and potassium fertilizer but phosphate should little difference.

• 한국작물학회지
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• 제50권5호
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• pp.340-345
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• 2005

A field experiment was conducted to assess the growth characteristics, seed and oil yield of two cultivars of soybean (G max (L.) Merr.) cv. PK-416 ($V_1$) and cv. PK-1024 ($V_2$) in relation to sulphur and nitrogen nutrition. Six combinations ($T_1-T_6$) of two levels of sulphur (0 and 40 kg $ha^{-1}$) and two levels of nitrogen (23.5 and 43.5 kg $ha^{-1}$) were applied to the two soybean cultivars as nutrients. Results indicated significant effect of sulphur and nitrogen, when applied together, on the growth characteristics, yield components, and seed and oil yield. Maximum response was observed with treatment $T_6$ (having 40 kg S and 43.5 kg N $ha^{-1}$). Seed and Oil yields were increased 90 and $102\%$ in $V_1$> and 104 and $123\%$ in $V_2$, respectively as compared to the control i.e. $T_1$ (having 0 kg S and 23.5 kg N $ha^{-1}$). Positive responses of S and N interaction on leaf area index, leaf area duration, crop growth rate and biomass production were also observed. The results obtained in these experiments clearly suggest that balanced and judicious application of nitrogen and sulphur can improve both seed and oil yield of soybean cultivars by enhancing their growth.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2022년도 추계학술대회
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• pp.63-63
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• 2022

Wheat flour can be categorized into bread, all-purpose, cake flour according to its protein content. Since optimal wheat flour protein content is different for each end use, it is necessary to diversify the nitrogen fertilizer methods depending on the end use and cultivar. Optimal wheat flour protein content of soft wheat (for cake flour) is lowest (<=10%) among all end use, it is necessary to develop nitrogen fertilizer methods for high yield and low protein content. In order to analyze the yield and quality changes of soft wheat as nitrogen fertilizer amount and splitting timing, soft wheat cultivar 'goso' was sown on paddy soil in jeunju, Republic of Korea ('21.10). the amount of nitrogen fertilizer was divided into 4 levels by adjusting 2kg/10a increments from 5.1 to ll.lkg/lOa, and in the N 7.1 and 9.1 kg/1 Oa(standard) treatment, N amount divided into sowing date:regrowing stage=3:7,4:6(standard), 5:5. In regrowing stage, Tiller number and N fertilizer amount at sowing date showed a correlation; y=-121.14x²+792.66x-525.41 (R²=0.77^*, y: Tiller number/m², x: N amount at sowing date(kg/10a)). Tiller number in regrowing stage was the highest when the nitrogen fertilizer amount at sowing date was 3.23kg/10a. spike number per m² was the highest when N fertilizer was divided into sowing date:regrowing stage=3:7(N amount: 9.1kg/10a). If N fertilizer amount was fixed, grain yield was also the highest when N fertilizer was divided into sowing date :regrowing stage=3:7. Also, N amount at sowing date and grain yield showed no correlation, but N amount at regrowing stage and grain yield showed significant correlation. As N amount increased, protein content also showed a tendency to increase.

• 한국작물학회지
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• 제51권6호
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• pp.534-538
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• 2006

The effects of Rhizobium inoculant, compost, and nitrogen on nodulation, growth, dry matter production, yield attributes, and yield of pea (Pisum sativum) var, IPSA Motorshuti-3 were assessed by a field experiment. Among the treatments Rhizobium inoculant alone performed best in recording number and dry weight of nodules/plant. The highest green seed yield of 8.38 ton/ha (36.9% increase over control) and mature seed yield of 2.97 ton/ha (73.7% increase over control) were obtained by the application of 90 kg N/ha. The effects of 60 kg N/ha, Rhizobium inoculant alone and Rhizobium inoculant along with 5 ton compost/ha were same as the effect of 90 kg N/ha in recording plant height, root length, dry weight of shoot, and root both at preflowering and pod filling stages, number of mature pods/plant, number of mature seeds/pod, 1000-seed weight, green, and mature seed yields of pea.

• 한국유기농업학회지
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• 제13권2호
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• pp.211-221
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• 2005

This experiment was conducted to evaluate the effect of animal slurry on nitrogen uptake of hairy vetch and growth of chinese cabbage in cropping system. Hairy vetch was seeded on September 20 in 2003 . We examined the effect of cover crop(hairy vetch (Vicia villosa Roth) and slurry application(0, l00, 200kg N/ha) on yield and N uptake. Dry matter yield and nitrogen uptake of hairy vetch were measured. The chinese cabbage succeeding cover crop was harvested in 2004. The nitrogen uptake of hairy vetch was 84, 121, 148kg N/ha respectively, when the slurry application was 0, 100 and 200kg N/ha. In addition. N uptake of hairy vetch at the plot of 100kg and 200 kg N/ha slurry were 44% and 76% higher than that of the plot without slurry application respectively. Slurry application of hairy vetch could increase nitrogen uptake by application of green manure at the harvesting time. the content of organic matter and P-content of soil with hairy vetch plot was higher than that of fallow plot due to inhibition of soil erosion. The organic matter levels tend to improve with the addition of hairy vetch. Hairy vetch could improve soil quality by reducing erosion compared with bare fallow. The green manure of hairy vetch with animal slurry maintained soil nutrient and reduced nitrogen fertilizer of chinese cabbage. The hairy vetch residues decomposed rapidly releasing half of their residues within 40 days after burial. The yield of chinese cabbage was 90% in the plot of manure of hairy vetch compared with chemical fertilizer. The yield in the plot treated with green manure of hairy vetch and 50% of chemical fertilizer was reduced 5% less than that of chemical fertilizer. Therefore, it was estimated that the green manure of hairy vetch-chinese cabbage cropping system could reduce nitrogen chemical fertilizer as much as 84~148kgN/ha. the green manure of hairy vetch with animal slurry maintained soil nutrient and reduced nitrogen fertilizer of chinese cabbage.