Effects of Mass Balance in Paddy Fields and Rice Plant Yields by Reduced Fertilizer Use and Non-Puddling Cultivation

Kaneki, Ryoichi; Iwama, Kenji; Minagawa, Akiko; Sudo, Miki; Odani, Hiromichi; Kobayashi, Atsushi; Tanaka, Ayumu; Ikeda, Kyoko; Muranaga, Motonori

doi:10.3178/jjshwr.26.201

Cited by 2 publications

(1 citation statement)

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“…Regardless of the treatments at 112 days of rice transplanting, the NO 3 − -N concentrations were higher compared with other sampling days (93 days) due to the start of drainage of the surface water in the rice paddy. The study showed that the application of SBMPs can be a solution to mitigate the loss of nitrogen and phosphorus [44]. The PO 4 − -P, K + , and SiO 2 concentrations in the surface paddy water under application of BMPFs are described in Figure 3.…”

Section: Paddy Water Qualitymentioning

confidence: 96%

Assessment of Agro-Environmental Impacts for Supplemented Methods to Biochar Manure Pellets during Rice (Oryza sativa L.) Cultivation

Shin¹,

Park

Jeong

2020

Energies

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The agro-environmental impact of supplemented biochar manure pellet fertilizer (SBMPF) application was evaluated by exploring changes of the chemical properties of paddy water and soil, carbon sequestration, and grain yield during rice cultivation. The treatments consisted of (1) the control (no biochar), (2) pig manure compost pellet (PMCP), (3) biochar manure pellets (BMP) with urea solution heated at 60 • C (BMP-U60), (4) BMP with N, P, and K solutions at room temperature (BMP-NPK), and (5) BMP with urea and K solutions at room temperature (BMP-UK). The NO 3 − -N and PO 4 − -P concentrations in the control and PMCP in the paddy water were relatively higher compared to SBMPF applied plots. For paddy soil, NH 4 + -N concentration in the control was lower compared to the other SBMPFs treatments 41 days after rice transplant. Additionally, it is possible that the SBMPFs could decrease the phosphorus levels in agricultural ecosystems. Also, the highest carbon sequestration was 2.67 tonnes C ha −1 in the BMP-UK treatment, while the lowest was 1.14 tonnes C ha −1 in the BMP-U60 treatment. The grain yields from the SBMPFs treatments except for the BMP-UK were significantly higher than the control. Overall, it appeared that the supplemented BMP-NPK application was one of the best SBMPFs considered with respect to agro-environmental impacts during rice cultivation.

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Section: Paddy Water Qualitymentioning

confidence: 96%