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Effect of Green Manure on Water-Stable Soil Aggregates and Carbon Storage in Paddy Soil
이초롱,김소휘,오유라,이상민,김유진 한국토양비료학회 2023 한국토양비료학회지 Vol.56 No.2
Green manure, used for eco-friendly agriculture, supplies organic matter (OM) and nutrients to soil and improvessoil fertility. Green manuring also has the potential to affect physical stability and carbon storage. Theobjective of this study was to investigate the effect of green manure on water-stable soil aggregates and carbonstock in paddy. Soil samples were collected from 3 treatments in Chungcheongnam-do Agricultural Researchand Extension Services on 29 April 2022; Control (CN), Green manure treatment (GM), and Chemical fertilizertreatment (NPK). Water-stable aggregate fractions (<53 μm, 53 - 250 μm, and >250 μm), carbon contents inbulk soil and aggregate fractions, and total carbon stock were analyzed. Carbon content in GM was 15% higherthan in NPK. However, there was no significant difference in soil carbon stock (Mg C ha-1) in GM and NPK. Water-stable aggregate ratio (%) and carbon percent of macro-aggregates (>250 μm) and micro-aggregates(53 - 250 μm) in GM were significantly higher than in NPK. As a result, green manure promoted soil aggregationand stabilized carbon in soil aggregates. These results confirmed that green manure, used for nutrientsupply, improves soil carbon storage and soil physical stability.
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Effects of Rice Straw Return on Soil Labile Organic Carbon and β-Glucosidase Activity in Paddy Soil
최소혜,이초롱,김소휘,정정아,이상민 한국토양비료학회 2023 한국토양비료학회지 Vol.56 No.4
Rice straw is a source of organic matter (OM) that improves soil fertility. After rice straw is returned to the soil, increased microbial enzyme activity decomposes organic residues, affecting soil carbon. To evaluate the effects of continuous rice straw return on soil labile organic carbon (LOC) fraction and β-glucosidase (BG) activity in paddy soil, an experiment was conducted with four treatments; Chemical fertilizer treatment (NPK), Chemical fertilizer + rice straw treatment (NPKR), Green manure treatment (GM) and Green manure + rice straw treatment (GMR). Hot water extractable carbon (HWEC) content, permanganate oxidizable carbon (POXC) content, and BG activity were analyzed. HWEC content was 42% higher than in NPKR than in NPK. It was 8% higher in GMR than in GM, but there was no significant difference. In addition, POXC content was 17% higher in NPKR than in NPK. It was 11% higher than in GMR than in GM, but there was no significant difference. BG activity was 36% higher in NPKR than NPK, and 55% higher in GMR than GM. As a result, in paddy soil that are low in OM due to the predominant use of chemical fertilizers, rice straw return is likely to increase OM supply and LOC content in the soil and contribute to carbon cycling.
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