Controlled mineralizing acetaldehyde condensation urea (CM-CDU) fertilizer can reduce nitrate leaching and N_2O emission from an Andisol with continuous cropped komatsuna (Brassica napa L.)(Fertilizers and Soil Amendments)
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概要
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To reduce nitrogen (N) loss from vegetable fields with minimum labor, the effects of a single application of different types of controlled mineralizing acetaldehyde condensation urea (CM-CDU) fertilizer on crop yield and N uptake, nitrate leaching from the surface soil (0-20cm) and N_2O emission from the soil after two continuous croppings of a leafy vegetable (komatsuna, Brassica napa L.) were examined. The following four treatments were established in plastic containers filled with an Andisol: urea, CM-CDU-4, CM-CDU-10 at a rate of 30g N m^<-2> and a control (no N fertilizer). The CM-CDU-4 and CM-CDU-10 treatments released 80% of N at 25℃ in 30-60 and 90-140 days after fertilizer application, respectively. The yields for the two crops were 1.55, 1.55, 1.26 and 0.34kg fresh weight m^<-2> in urea, CM-CDU-4, CM-CDU-10 and the control, respectively. The amount of total nitrate leaching was 3.4, 2.3, 1.2 and 0.3g N m^<-2> from urea, CM-CDU-4, CM-CDU-10 and the control, respectively. The total amount of N_2O emission from urea, CM-CDU-4, CM-CDU-10 and the control over two crops was 0.12, 0.06, 0.04 and 0.01g N m^<-2>, respectively. The emission factors were 0.7, 0.3 and 0.2 from the urea, CM-CDU-4 and CM-CDU-10 treatments, respectively. The N use efficiency of urea, CM-CDU-4 and CM-CDU-10 was 87, 85 and 59%, respectively. Among the examined fertilizers, we recommend CM-CDU-4 as best for komatsuna production after examining two continuous croppings with a single application.
- 社団法人日本土壌肥料学会の論文
著者
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Inubushi Kazuyuki
Graduate School Of Horticulture Chiba University
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AMKHA Suphachai
Graduate School of Science and Technology, Chiba University
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SAKAMOTO Atsushi
JCAM AGRI. Co., Ltd
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TACHIBANA Masami
JCAM AGRI. Co., Ltd
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Suphachai Amkha
Graduate School Of Science And Technology Chiba University:department Of Soil Science Faculty Of Agr
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Tachibana Masami
Jcam Agri. Co. Ltd
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Sakamoto Atsushi
Jcam Agri. Co. Ltd
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Amkha Suphachai
Kasetsart Univ.
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Inubushi Kazuyuki
Graduate School of Horticulture, Chiba University
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