Effect of Sesbania Incorporation as Nitrogen Source on Growth and Yield of Whole Crop Barley and Reduction of N Fertilizer in Saemangeum Reclaimed Tidal Land

Self Cite

This study was conducted to examine the yield and antioxidant activity of vegetable crops under the salt affected greenhouse soil in order to evaluate the possibility of greenhouse farming in "Saemangeum reclaimed land". Field experiment was conducted on a sandy loam soil and four different vegetable crops, Swiss chard (Beta vulgaris L.), Kale (Brassica oleracea ver. acephala), Red mustard (Brassica juncea L.), and Endive (Cichorium endivia L.) were cultivated. In the third year of the experiment, the soil salinity dramatically increased up to 23.5 dS m -1 from 2.2 dS m -1 in the first year of the experiment due to the resalinization of soil. The cumulative yield was 2,675 kg 10a -1 (Endive) > 2,560 kg 10a -1 (Red mustard) > 1,819 kg 10a -1 (Kale) > 1,795 kg 10a -1 (Swiss chard). Yield was inversely correlated with soil salinity (R 2 = 0.71-0.77) but the red mustard was not significantly correlated with soil salinity. Both DPPH free radical activity and total phenol content were higher with red mustard. K/Na leaves ratio as an indication of the salt tolerance was in the order of Red mustard > Endive ≥ Swiss chard ≥ Kale.

Section: Introductionunclassified

Yield and Antioxidant Activity of Vegetable Crops Under Salt Affected Greenhouse Soil in Saemangeum Reclaimed Land

Jang¹,

Youn²,

Ahn³

et al. 2018

Self Cite

“…생육시기별로 미세먼지의 각 성분 농도를 살펴보면 PM 10 과 PM 2.5 모두 양이온은 Na + , 음이온은 SO 4 나타나는데(Lee et al, 2018;Kim et al, 2021), 새만금간척지 토양은 Na + 함량이 높고 Ca 2+ 농도가 낮은 간척지 토양(Lee et al, 2016) 특성과 유사하게 미세먼지의 이온 특성도 Na + 농도는 높고 Ca 2+ 농도는 낮게 측정되었으므로 주로 미세먼지가 바람에 의해 토양에서 비산되어 발생하였기 때문으로 추정된다. 또한, 봄 감자 생육시기의 미세먼지…”

unclassified

Reductions of Particulate Matters Emission by Soil Surface Management of Potato-Cultivated Fields in Saemangeum Reclaimed Land

Seo,

Lee,

Lee

et al. 2023

Concerns on fine dust originated from agricultural lands such as reclaimed tidelands located in the western coastal area of South Korea is increasing. Saemangeum reclaimed land (RTL), which is located in the western coastal area, is inherently susceptible to windblown dust due to the strong westerly winds and relatively flat terrain with few hills or mountains. In addition, Saemangeum RTL has a low organic matter content (<5%) and thus the soils are also susceptible to wind erosion. Therefore, agricultural measures, such as soil surface cover, to reduce wind erosion at the agricultural soils of the RTL need to be implemented. This study was conducted to investigate the effects of soil surface managements on the reduction of particulate matter emissions during the cultivation of spring and fall potatoes (superior) in Saemangeum RTL in 2020. Three treatments were established: control (no surface cover), vinyl mulching cover, and rice straw + vinyl mulching cover. The results showed that vinyl mulching alone was more effective in reducing fine dust emissions than that with vinyl mulching + rice straw cover, probably indicating rice straw can be a fine dust source as rice straw is likely to decompose on the soil surface. The ion composition of fine dust indicated that Na + is the dominant ion species that is contrast to that from urban areas, which NH 4 + is dominant. This study presents a possible reduction of fine dust emissions by using vinyl mulching in the Saemangeum RTL. Further research is necessary to elucidate the mechanisms of the increased fine dust emission by rice straw cover.

“…하로 급격히 감소하는 경향을 보였다. 일반적인 농경지에서 겉보기질소이용효율은 30 -50% 수준이며 품종과 질소 시비량 수준에 따라서도 큰 차이를 보이는 것으로 알려져 있다(Kang et al, 2013;Lee et al, 2016). 본 시험에서 질소 이용효율은 일반적인 수준보다 다소 낮은 경향을 보였는데 이는 간척지 토양의 유기물함량이 매우 낮은 사양질 토양…”

unclassified

Estimation of Optimum N Fertilizer and Sowing Rate for Italian Ryegrass Seed Production in the Saemangeum Reclaimed Land

Bae¹,

Jang²,

Ahn³

et al. 2021

Italian ryegrass (Lolium multiflorum Lam.) was cultivated in a field experiment, on sandy loam soil of the Saemangeum reclaimed land, under different sowing rates and N fertilizer levels to estimate the optimum N fertilizer requirement and the most suitable sowing rate for seed production. The experiment was conducted in a split-plot design with four replications. The main-plots were four sowing rates of 10, 20, 30, and 40 kg ha -1 and sub-plots were five N fertilizer application rates of 0, 45, 90, 135, and 180 kg ha -1 . Harvest index decreased with increasing sowing and N fertilizer rate. The highest N use efficiency was obtained at 10 kg ha -1 sowing rate and 45 -90 kg ha -1 N fertilizer application rates. Maximum seed yield of Italian ryegrass based on the regression curve of N fertilizer application level was 102 kg ha -1 and was decreased with further N application. Economically, optimum rates of N application ranged from 70 to 101 kg ha -1 depending on the sowing rate. Results from this experiment, could therefore inform producers of the best combination of sowing and N fertilizer rates needed to increase profitability of Italian ryegrass seed production alongside preventing N loss. However, further research will be necessary to elucidate on increasing seed quality and stability of cultivation under various environmental conditions.