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Hyeoun-Suk Cho,Ki-Yeung Seong,Tea-Sun Park,Myung-Chul Seo,Mi-Hyang Kim,Hang-Won Kang,Hye-Jin Lee 한국토양비료학회 2013 한국토양비료학회지 Vol.46 No.6
We researched nitrogen and green manure yield of crotalaria by seeding rate; 50, 60, 70, 80, 90 kg ha<SUP>-1</SUP> in upland soil to find out crotalaria"s optimal seeding rate. Crotalaria"s plant height and number of leaves increased when the harvest time was later regardless of its seeding rate. Its nitrogen content of above-ground part was 19.8 g ha<SUP>-1</SUP>, and C/N ratio was 22.5. The highest nitrogen content (50.3 g kg<SUP>-1</SUP>) was found in flowers part, followed by its leaves, roots and stems. The green manure yields of crotalaria increased when the harvest time was later. The green manure yield of crotalaria was biggest in 50kg ha<SUP>-1</SUP> which was low in seeding rate. It tended to decrease when the seeding rate was higher, and the nitrogen yield had the same tendency. Therefore, the appropriate seeding rate was 50kg ha<SUP>-1</SUP> and the time for application to soil was considered to be the flowering stage.
Effects of Spring Seeding on Growth and Carbon Uptake of Clover Species in Upland Soil
Hyeoun-Suk Cho,Myung-Chul Seo,Jun-Hwan Kim,Wan-gyu Sang,Pyeong Shin,Geon Hwi Lee 한국토양비료학회 2017 한국토양비료학회지 Vol.50 No.6
Clover, a legume crop, is a landscape crop and green manure crop that can be sowing in spring. Clover serves various roles such as landscape composition, weeds suppressing, prevention of soil loss and nutrients on sloping, atmosphere purification, and supplying nitrogen in soil. Thus, in order to utilize this crop in agricultural land, we observed its effect on growth and carbon uptake in upland soil. The plant height of clover species increased with late harvesting time and was 46.0~55.0 cm at 90 days after seeding (DAS) and the longest in red clover. The dry matter increased at 85 DAS, after that, decreased slightly. The dry matter of white clover and red clover was 3.0 Mg ha<SUP>-1</SUP> and 3.1 Mg ha<SUP>-1</SUP>, respectively, and crimson clover was 2.5 Mg ha<SUP>-1</SUP>, significantly lower than other clover. Crops bloomed at 90 DAS were white clover and crimson clover, the period from sowing to flowering was 78 days for crimson clover and 85 days for white clover. The nitrogen content of the clover species was 12.0~29.3 g kg<SUP>-1</SUP>, with the highest of 29.3 g kg<SUP>-1</SUP> for white clover. The carbon content of clover species was similar in all clover species, but carbon uptake was high in white clover and red clover, and lowest in crimson clover. The carbon uptake of the plant increased to 85 DAS and then decreased. Based on the clover growth and carbon uptake, white clover and red clover were promising when sown in spring.
Cho, Hyeoun-Suk,Jeon, Weon-Teai,Seong, Ki-Yeung,Kim, Chung-Guk,Jeong, Kwang-Ho,Park, Woo-Yeong Korean Association of Organic Agriculture 2011 韓國有機農業學會誌 Vol.19 No.S
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.
Cho, Hyeoun-Suk,Seong, Ki-Yeung,Park, Tea-Sun,Seo, Myung-Chul,Kim, Mi-Hyang,Kang, Hang-Won,Lee, Hye-Jin 한국토양비료학회 2013 한국토양비료학회지 Vol.46 No.6
We researched nitrogen and green manure yield of crotalaria by seeding rate; 50, 60, 70, 80, 90 kg $ha^{-1}$ in upland soil to find out crotalaria's optimal seeding rate. Crotalaria's plant height and number of leaves increased when the harvest time was later regardless of its seeding rate. Its nitrogen content of above-ground part was 19.8 g $ha^{-1}$, and C/N ratio was 22.5. The highest nitrogen content (50.3 g $ha^{-1}$) was found in flowers part, followed by its leaves, roots and stems. The green manure yields of crotalaria increased when the harvest time was later. The green manure yield of crotalaria was biggest in 50kg $ha^{-1}$ which was low in seeding rate. It tended to decrease when the seeding rate was higher, and the nitrogen yield had the same tendency. Therefore, the appropriate seeding rate was 50kg $ha^{-1}$ and the time for application to soil was considered to be the flowering stage.
Hyeoun-Suk Cho,Ki-Yeung Seong,Tae-Seon Park,Myung-Chul Seo,Mi-Hyang Kim,Hang-Won Kang 한국토양비료학회 2014 한국토양비료학회지 Vol.47 No.5
Landscape crops have decorated its surrounding landscape by being cultivated from spring to late fall. Recently, landscape crops are starting to get the limelight as crops that can be cultivated in large area farmlands. Therefore, we examined the growth characteristics of landscape crops, green manure yield and nitrogen production of crops that are cultivated during summer, which are sunflower, cosmos, sunnhemp and sesbania, in order to select crops that can be utilized as landscape crops and green manure crops. The height of landscape crops increased when the harvest time was later. Especially, sunnhemp, cosmos, sunflower and sorghum grew over 100cm. The days to flowering of sunnhemp and cosmos were 50 and 53 days each, and their flowering period of more than 50 days were long. The days to flowering of sunflower, which was 52 days, was short, and its flowering period, which was 21 days, was also short. When the harvest time was later, the green manure yield and nitrogen production of all crops increased. Individually, the green manure yield was higher in sunnhemp, sorghum, sunflower, with 7.2~7.5 Mg ha<SUP>-1</SUP>, and was lowest in sesbania. The nitrogen production was higher in sunnhemp, with 168.1 kg ha<SUP>-1</SUP> Therefore, as seen in its flowering characteristics, green manure yield and nitrogen production, sunnhemp had the best green manure and landscape effects among the landscape crops for summer.
Cho, Hyeoun-Suk,Seong, Ki-Yeung,Park, Tae-Seon,Seo, Myung-Chul,Kim, Mi-Hyang,Kang, Hang-Won 한국토양비료학회 2014 한국토양비료학회지 Vol.47 No.5
경관작물은 봄부터 늦은 가을까지 도로변, 하천변, 화단에 재배되어 우리 주변 환경을 아름답게 꾸며주는 역할을 수행하였으나 최근에는 대면적의 농경지에 재배되면서 넓은 면적에 재배가 가능한 작물들이 각광을 받기 시작하였다. 따라서 여름에 재배되는 작물 중에서 경관작물과 녹비작물로 이용 가능한 작물을 선발하고자 해바라기, 코스모스, 네마장황, 네마황, 세스바니아, 수수의 작물 생육특성, 녹비수량 및 질소생산량을 조사하였다. 경관작물의 초장은 수확시기가 늦을수록 증가하였으며 특히 네마장황, 코스모스, 해바라기, 수수는 100 cm 이상으로 컸다. 네마장황과 코스모스의 개화소요일수는 각각 50일, 53일로 짧아 가장 빨리 개화가 시작되었으며 개화기간은 50일 이상으로 길었다. 해바라기는 개화되는데 52일이 소요되어 짧았으나, 개화기간이 21일로 짧았다. 녹비수량과 질소생산량은 모든 작물에서 수확시기가 늦어질수록 증가하였다. 녹비수량은 네마장황, 수수, 해바라기에서 $7.2{\sim}7.5Mg\;ha^{-1}$로 가장 많았고 세스바니아에서 가장 적었으며, 질소생산량은 네마장황에서 $168.1kg\;ha^{-1}$으로 가장 많았다. 따라서, 개화특성, 녹비수량, 질소생산량을 기준으로 볼 때 여름용 경관작물 중 네마장황이 녹비와 경관 효과가 가장 우수하였다. Landscape crops have decorated its surrounding landscape by being cultivated from spring to late fall. Recently, landscape crops are starting to get the limelight as crops that can be cultivated in large area farmlands. Therefore, we examined the growth characteristics of landscape crops, green manure yield and nitrogen production of crops that are cultivated during summer, which are sunflower, cosmos, sunnhemp and sesbania, in order to select crops that can be utilized as landscape crops and green manure crops. The height of landscape crops increased when the harvest time was later. Especially, sunnhemp, cosmos, sunflower and sorghum grew over 100cm. The days to flowering of sunnhemp and cosmos were 50 and 53 days each, and their flowering period of more than 50 days were long. The days to flowering of sunflower, which was 52 days, was short, and its flowering period, which was 21 days, was also short. When the harvest time was later, the green manure yield and nitrogen production of all crops increased. Individually, the green manure yield was higher in sunnhemp, sorghum, sunflower, with $7.2{\sim}7.5Mg\;ha^{-1}$, and was lowest in sesbania. The nitrogen production was higher in sunnhemp, with $168.1kg\;ha^{-1}$ Therefore, as seen in its flowering characteristics, green manure yield and nitrogen production, sunnhemp had the best green manure and landscape effects among the landscape crops for summer.
Hyeoun-Suk Cho,Myung-Chul Seo,Tea-Seon Park,Jun-Hwan Kim,Wan-gyu Sang,Pyeong Shin,Geon-Hwi Lee 한국토양비료학회 2015 한국토양비료학회지 Vol.48 No.6
Although it is not a landscape crop according to MIFAFF(ministry of agriculture, food and rural affairs), yellow mustard is considered a superb landscape crop because of its growth and flower characteristics. We sowed yellow mustard as a landscape and green manure crop in upland soil (four types of soil texture) in spring. And we studied its flowering characteristics, dry weight, and nitrogen yield. The growths of yellow mustard were possible in every soil ranging from sandy soil to clay loam. Its height was 54.1 ~ 76.1cm and the number of node per hill was 11.3 ~ 17.0. Its flowers had a light yellow. It took about 44 ~ 50 days to flower, and flowered for 22~25 days. The dry weight of yellow mustard was 2.27 ~ 3.60 ton ha<SUP>-1</SUP> with highest in sandy loam and loam. Among the nutrients of yellow mustard, nitrogen(T-N) was 12.6~20.8 g kg<SUP>-1</SUP>, and C/N ratio was 21.6~37.7. The nitrogen yield of yellow mustard was 35 ~ 62 kg ha<SUP>-1</SUP>. In conclusion, because of its flowering characteristics and dry weight, yellow mustard was considered appropriate for both green manure and landscape crop uses.
Hyeoun-Suk Cho,Weon-Teai Jeon,Ki-Yeung Seong,Chung-Guk Kim,Kwang -Ho Jeong,Woo-Yeong Park 한국유기농업학회 2011 韓國有機農業學會誌 Vol.19 No.S
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- I when the nitrogen supply was the largest with HV and 5.42 ton ha- I 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. Introduction