Effects of Application Using Coated Urea and Dicyandiamide for Tea Field

Miura, Nobuyuki; Uchimura, Koji; Kaji, Toshiyuki; Nakamura, Takahisa; Yoshida, Shigeaki; Katsuda, Masato; Karasuyama, Mitsuaki

doi:10.5979/cha.2007.41

Cited by 1 publication

(2 citation statements)

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“…One of the possible causes of increase in N 2 O emissions in DCD plots was the effect of repeated application of DCD. The repeated application of DCD to tea field soil was reported to affect the composition of microorganisms, resulting in a decreased effect of nitrification inhibition of DCD year by year (Miura et al 2007). Rajbanshi et al (1992) reported that repeated application of DCD enhanced its degradation in soil.…”

Section: Discussionmentioning

confidence: 97%

“…Watabe (1991) reported that when DCD was applied to tea fields, the N content and amino acid content in tea leaves increased as a result. It was also reported that application of DCD can reduce the amount of N leaching from the soil (Morita et al 2002), and that coated urea with DCD improved the quality of tea leaves compared with those cultivated with conventional fertilizer (Miura et al 2007;Sakaida et al 2010).…”

Section: Discussionmentioning

confidence: 97%

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Effects of application of lime nitrogen and dicyandiamide on nitrous oxide emissions from green tea fields

Hirono

Nonaka

2014

Soil Science and Plant Nutrition

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The aim of this study was to assess the mitigating effects of lime nitrogen (calcium cyanamide) and dicyandiamide (DCD) application on nitrous oxide (N 2 O) emissions from fields of green tea [Camellia sinensis (L.) Kuntze]. The study was conducted in experimental tea fields in which the fertilizer application rate was 544 kg nitrogen (N) ha −1 yr −1 for 2 years. The mean cumulative N 2 O flux from the soil between the canopies of tea plants for 2 years was 7.1 ± 0.9 kg N ha −1 yr −1 in control plots. The cumulative N 2 O flux in the plots supplemented with lime nitrogen was 3.5 ± 0.1 kgN ha −1 , approximately 51% lower than that in control plots. This reduction was due to the inhibition of nitrification by DCD, which was produced from the lime nitrogen. In addition, the increase in soil pH by lime in the lime nitrogen may also be another reason for the decreased N 2 O emissions from soil in LN plots. Meanwhile, the cumulative N 2 O flux in DCD plots was not significantly different from that in control plots. The seasonal variability in N 2 O emissions in DCD plots differed from that in control plots and application of DCD sometimes increased N 2 O emissions from tea field soil. The nitrification inhibition effect of lime nitrogen and DCD helped to delay nitrification of ammonium-nitrogen (NH 4 + -N), leading to high NH 4 + -N concentrations and a high ratio of NH 4 + -N /nitrate-nitrogen (NO 3 --N) in the soil. The inhibitors delayed the formation of NO 3 --N in soil. N uptake by tea plants was almost the same among all three treatments.

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Section: Discussionmentioning

confidence: 97%