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Seul-Bi Lee,Yang-Min Kim,Ye-Jin Lee,Yo-Sung Song,Cheol-Hyun Ryu,Deog-Bae Lee,Chan-Wook Lee,Chang-Hoon Lee,Jwakyung Sung 한국토양비료학회 2019 한국토양비료학회지 Vol.52 No.4
Given continuous needs for a public duty of agriculture and rural area, an effort to improve nutrient management in agricultural sector is strongly required. As a measure to solve these problems, Korean government (MAFRA) introduced the promotion policy called as “Agro-Environment Conservation Program (AECP)” in 2018 and has expanded 5 projet sites in 2019 from 3 in 2018. The program has a variety of agricultural activity to conserve soil, water, air, ecology and landscape. Of those, the nutrient input activity which is one of sub-activities is closely involved in not only crop productivity but also water quality and air pollution. Therefore, in order to lead a soft landing of AECP, it is essential to evaluate the conservation effects in a scientific point of view. In this respect, we focused on evaluating the effect of recommended nutrient input activities, standard fertilization and soil test fertilization, on rice productivity and nitrogen balance. The effect of nutrient management which is explained by rice yield and nitrogen balance was estimated with the combination of soil characteristics and rice varieties. Rice yield by recommended fertilization was 654 kg per 10a, 6% lower than control, but there was no statistical significance. By contrast, nitrogen balance was 4.7 kg lower, which means great improvement, in the recommended than the control. Conclusively, the recommended fertilization like soil test fertilization is expected to be useful as a measure to reduce nutrient balance, to ensure crop productivity, and finally to perform a public role of agriculture.
Lee, Seul Bi,Lee, Chang Hoon,Jung, Ki Yuol,Park, Ki Do,Lee, Dokyoung,Kim, Pil Joo Elsevier 2009 Soil & tillage research Vol.104 No.2
<P><B>Abstract</B></P><P>Soil organic carbon (SOC) has an important role in improving soil quality and sustainable production. A long-term fertilization study was conducted to investigate changes in SOC and its relation to soil physical properties in a rice paddy soil. The paddy soils analyzed were subjected to different fertilization practices: continuous application of inorganic fertilizers (NPK, N–P–K=120–34.9–66.7kgha<SUP>−1</SUP>yr<SUP>−1</SUP> during 1967–1972 and 150–43.7–83.3kgha<SUP>−1</SUP>yr<SUP>−1</SUP> from 1973 to 2007), straw based compost (Compost, 10Mgha<SUP>−1</SUP>yr<SUP>−1</SUP>), a combination of NPK+Compost, and no fertilization (control). Soil physical properties were investigated at rice harvesting stage in the 41st year for analyzing the relationship with SOC fraction. Continuous compost application increased the total SOC concentration in plough layers and improved soil physical properties. In contrast, inorganic or no fertilization markedly decreased SOC concentration resulting to a deterioration of soil physical health. Most of the SOC was the organo-mineral fraction (<0.053mm size), accounting for over 70% of total SOC. Macro-aggregate SOC fraction (2–0.25mm size), which is used as an indicator of soil quality rather than total SOC, covered 8–17% of total SOC. These two SOC fractions accumulated with the same tendency as the total SOC changes. Comparatively, micro-aggregate SOC (0.25–0.053mm size), which has high correlation with physical properties, significantly decreased with time, irrespective of the inorganic fertilizers or compost application, but the mechanism of decrease is not clear. Conclusively, compost increased total SOC content and effective SOC fraction, thereby improving soil physical properties and sustaining production.</P>
Seul-Bi Lee,Yang-Min Kim,Jwa-Kyung Sung,Ye-Jin Lee,Deog-Bae Lee 한국토양비료학회 2018 한국토양비료학회지 Vol.51 No.4
As fertigation facilities in a greenhouse have increased, information on the nutrient requirement along the plant growth stages is highly needed. This study investigated the nutrient uptake pattern of leafy lettuce cultivated in a pot filled with a sandy loam soil in a greenhouse from March to June in 2016 and to calculate the amount of nutrient supply with growth stages of lettuce by fertigation system. With different nitrogen (N) top-dressing supply levels (0.5N, 0.75N, 1.0N, and 1.5N) by soil NO₃-N based recommendation, the characteristics of growth and nutrient uptake of lettuce along the growth stages have been evaluated. Soil NO₃-N decreased along the growth stages, having no significant differences among N supply levels lettuce leaf growth showed linear growth patterns and there was no clear difference in growth and nutrient uptake among N supply levels. The growth of lettuce was 17%, 38%, and 64% of total accumulated growth of lettuce (dried weight, averaged N supply level) after 40 days, 50 days, and 60 days after seeding (DAS), respectively, reached to 38.9 kg 10a<SUP>-1</SUP> at 70 DAS. Mineral uptake (N, P₂O5, and K₂O) of lettuce along the growth stages, showing different patterns with nutrient species, was characterized into increasing pattern in N uptake, steady-increasing pattern in P₂O5 uptake, and step-like pattern in case of K₂O uptake. With growth stages of lettuce, the N uptake was 26%, 17%, 20%, and 37% of total N uptake, 24%, 3%, 12%, and 50% in case of total P₂O5 uptake, and 20%, 31%, 12%, and 34% of total K₂O uptake. In conclusion, the scheduling of the fertigation nutrient supply designed on the basis of daily nutrient uptake and nutrient use efficiency by fertigation system could contribute to maintain stable productivity of lettuce and ameliorate the nutrient accumulation of greenhouse soil.
Yield and Free Sugar Contents of Burdock (Arctium lappa L.) depending on Nitrogen Levels
Lee, Ye-Jin,Sung, Jwa-Kyung,Lee, Seul-Bi,Lim, Jung-Eun,Song, Yo-Sung,Lee, Deog-Bae 한국토양비료학회 2016 한국토양비료학회지 Vol.49 No.6
Excessive nitrogen fertilization influences crop yields and quality as well as environmental pollution. In this study, yields, nitrogen use efficiency and free sugar contents of burdock (Arctium lappa L.) were evaluated at different levels of nitrogen fertilization. Nitrogen fertilizer was applied at 5 levels (0, 50, 100, 150, 200%) based on the conventional fertilization ($N=230kg\;ha^{-1}$), and phosphate and potassium fertilizer were treated by conventional P and K fertilization ($P_2O_5-K_2O=140-210kg\;ha^{-1}$) in all plots. The root yields of burdock were the highest in N 100~150% treatment plots. Nitrogen use efficiency and nitrogen recovery decreased from over N 150% treatment. Nitrogen uptake of root was greater than that of shoot in N 50~200% treatments. Fructose contents in root were inversely proportional to the level of nitrogen fertilization. As considering nitrogen recovery and root quality, economical burdock yield was obtained in N $230kg\;ha^{-1}$.