• Title/Summary/Keyword: Crop Cultivation

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Temperature-dependent Differences in Heading Response at Different Growth Stages of Rice

  • Lee, HyeonSeok;Choi, MyoungGoo;Lee, YunHo;Hwang, WoonHa;Jeong, JaeHyeok;Yang, SeoYeong;Lim, YeonHwa;Lee, ChungGen;Choi, KyungJin
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.64 no.3
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    • pp.213-224
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    • 2019

  • There is an increasing frequency in the occurrence of abnormal weather phenomena such as sharp increases and decreases in temperature. Under these weather conditions, the heading time of rice changes unexpectedly, which poses problems in agriculture. Therefore, we investigated the effect of temperature on the heading response at different growth stages in rice. During the period from transplanting to heading, the plants were subjected to different temperature treatments, each for a 9-day period, to observe the heading response. For the heading date analysis, "heading date" was defined as the number of days from transplanting to the appearance of the first spikelet. We found that the influence of temperature increased in the order of rooting stage, followed by meiosis, early tillering, spikelet differentiation, and panicle initiation stage in all ecological types and cultivars. In particular, unlike the results reported previously, the effect of temperature on heading during the photo-sensitive period was very small. Meanwhile, the influence of temperature on vegetative growth response at different growth stages was not consistent with heading response. These results can be used as basic data for predicting the variation in heading date owing to temperature variation at each growth stage. In addition, we propose that the concept of day length should be included in determining the influence of temperature on the photo-sensitive period.

  • https://doi.org/10.7740/kjcs.2019.64.3.213 인용 PDF KSCI

Changes in Methane Emissions from Paddy under Different Tillage and Cultivation Methods (벼 재배 시 경운 및 재배방법에 의한 메탄발생 양상)

  • Kim, Sukjin;Cho, Hyun-Suk;Choi, Jong-Seo;Park, Ki Do;Jang, Jeong-Sook;Kang, Shin-gu;Park, Jeong-Hwa;Kim, Min-Tae;Kang, In-Jeong;Yang, Woonho
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.61 no.4
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    • pp.251-256
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    • 2016

  • The increase in carbon stock and sustainability of crop production are the main challenges in agricultural fields relevant to climate change. Methane is the most important greenhouse gas emitted from paddy fields. This study was conducted to investigate the effects of tillage and cultivation methods on methane emissions in rice production in 2014 and 2015. Different combinations of tillage and cultivation were implemented, including conventional tillage-transplanting (T-T), tillage-wet hill seeding (T-W), minimum tillage-dry seeding (MT-D), and no-tillage-dry seeding (NT-D). The amount of methane emitted was the highest in T-T treatment. In MT-D and NT-D treatments, methane emissions were significantly decreased by 77%, compared with that in T-T treatment. Conversely, the soil total carbon (STC) content was higher in MT-D and NT-D plots than in tillage plots. In both years, methane emissions were highly correlated with the dry weight of rice ($R^2=0.62{\sim}0.96$), although the cumulative emissions during the rice growing period was higher in 2014 than in 2015. T-T treatment showed the highest $R^2$ (0.93) among the four treatments. Rice grain yields did not significantly differ with the tillage and cultivation methods used. These results suggest that NT-D practice in rice production could reduce the methane emissions and increase the STC content without loss in grain yield.

  • https://doi.org/10.7740/kjcs.2016.61.4.251 인용 PDF KSCI

Effects of cultivation methods on methane emission in rice paddy

  • Kim, Sukjin;Choi, Jong-Seo;Kang, Shin-gu;Park, Jeong-wha;Yang, Woonho
    • Proceedings of the Korean Society of Crop Science Conference
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    • 2017.06a
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    • pp.319-319
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    • 2017

  • Methane is the main greenhouse gas released from rice paddy field. Methane from paddy fields accounts for 11 % of the global total methane emission. The global warming potential (GWP) of methane is 25 times more than that of carbon dioxide on a mass basis. It is well known that most effective practice to mitigate methane in paddy is related to the water management during rice growing season and the use of organic matters. This study was conducted to investigate the effects of tillage and cultivation method on methane emission in paddy. Tillage (tillage and no-tillage) and cultivation methods (transplanting and direct seeding) were combined tillage-transplanting (T-T), tillage-wet hill seeding (T-W), tillage-dry seeding (T-D) and no-till dry seeding (NT-D) to evaluate methane mitigation efficiency. Daily methane emission was decreased on seeding treatments (T-W, T-D, NT-D) than transplanting treatment (T-T). Amount of methane emission during rice growing season is highest in T-T ($411.7CH_4\;kg\;ha^{-1}y^{-1}$) and lowest in NT-D treatment (89.7). In T-W and T-D treatments, methane emissions were significantly decreased by 36 and 51 % respectively compared with T-T. Methane emissions were highly correlated with the dry weight of whole rice plant ($R^2=0.62{\sim}0.93$). T-T treatment showed highest $R^2$ (0.93) among the four treatments. Rice grain yields did not significantly differ with the tillage and cultivation methods used. These results suggest that direct seeding practice in rice production could mitigate the methane emissions without loss in grain yield.

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