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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.
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
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,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.
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.