Reduction of nitrogen, phosphorus, and suspended solids effluent loads from paddy fields by transplanting into retained ponding water using a GNSS-controlled rice transplanter

Kondoh, Tadashi; Nagasaka, Yoshisada; Kato, Atushi; Shindo, Hayato; Kato, Miyako; Saito, Masanori; Fujiwara, Koki; Yamamoto, Satoshi; Yaji, Yukio

doi:10.1007/s10333-019-00714-5

Cited by 3 publications

(4 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The drainage performed right after this process does not allow the time required for the particles to precipitate, which increases the suspended solids content. Kondoh et al (2019) observed that, without a flood holding period before drainage, the precipitate contents increased from 54 to 2700 mg•L -1 , which corresponded to 54 and 2700 kg•ha -1 of solids lost by drainage water.…”

Section: Resultsmentioning

confidence: 97%

See 1 more Smart Citation

Greenhouse gas emission, water quality and straw decomposition as a function of rice postharvest field management

et al. 2020

View full text Add to dashboard Cite

The objective of this paper was to evaluate the quality of water drained after the use of the knife-roller (an implement used to incorporate rice residues after harvest), the partial global warming potential (pGWP) and straw decomposition as a result of postharvest field management of irrigated rice. The experiments were conducted during the 2018 and 2019 offseason and the treatments consisted of several water drainage periods (0, 3, 6, 9 and 12 days) after a field pass with a knife-roller. In addition, a nonflooded harvest treatment without straw management was included. Analysis of drainage water three days after a pass with the kniferoller showed a reduction in total soluble solids by 94% compared to zero days. Nitrogen and soluble phosphorus were not influenced by the treatments. However, potassium levels increased as the drainage period increased, which is related to the period between harvest and drainage. As the electrical conductivity is influenced by the concentration of ions, it showed the same response curve as the potassium levels and, for pH, there were small oscillations influenced by the temperature. The total CH 4 emission and the pGWP were higher when the water depth remained for a longer period. However, the N 2 O emissions were higher in the absence of soil submersion. Water should be drained three days after a pass with the knife-roller in order to reduce potassium loss and suspended solids as well as pGWP. The use of the knife-roller accelerated the process of straw decomposition in relation to the unmanaged straw treatment.

show abstract

Section: Resultsmentioning

confidence: 97%

“…However, after this process, it is necessary to drain the standing water, which carries suspended particles leading to the loss of nutrients adsorbed to the particles or present in the solution (Kondoh et al 2019). Xiao et al (2015) observed that the loss of nutrients N, P and sediments was reduced under controlled drainage.…”

Section: Introductionmentioning

confidence: 99%

Greenhouse gas emission, water quality and straw decomposition as a function of rice postharvest field management

et al. 2020

View full text Add to dashboard Cite

show abstract

“…In addition, the Non-puddled Rice and Direct-seeded Rice techniques are more environmentally friendly, since puddling involves the release of muddy puddling water that causes a large pollution load (Harada et al, 2008). Although non-puddling rice cultivation has risks, including reduced planting accuracy of rice, increased water leakage from the field, and the potential need for significant adjustment of soil water conditions before tillage (Kondoh et al, 2019), the technique may be worth adopting under the ricesoybean rotation system.…”

Section: Resultsmentioning

confidence: 99%

“…The generally established method of planting lowland rice in paddy fields is by transplantation in tilled and puddled fields. Although puddling offers advantages in weed control and prevention of water leakage (Kondoh et al, 2019), leading to stable rice cultivation, this conventional practice is labor-, water-, capital-, and energyintensive, and it is becoming less profitable as these resources are becoming increasingly scarce (Chakraborty et al, 2017). Omitting puddling can reduce labor and fuel costs, and irrigation water input, for land preparation for rice establishment (Hossen et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Non-puddling rice cultivation increases subsequent soybean yield in a rice–soybean rotation system

Samejima

Chonan

Yamane

et al. 2020

Plant Production Science

View full text Add to dashboard Cite

Non-puddling rice cultivation would increase subsequent soybean yield. Soybean (cv. 'Yukihomare') was grown in farmers' fields previously cultivated with puddled transplanted rice (Puddled Rice), non-puddled transplanted rice (Non-puddled Rice), and dry direct-seeded rice (Direct-seeded Rice) in central Hokkaido, Japan. Average soybean yield was significantly (p < 0.05) higher in Non-puddled Rice fields (411 g m −2) and in Direct-seeded Rice fields (404 g m −2) than in Puddled Rice fields (352 g m −2). The respective yield increases (16.8% and 14.7%) indicate that non-puddling rice cultivation increased subsequent soybean yield. The significantly higher values for shoot dry weight and number of seeds per m 2 seen in fields after non-puddling rice cultivation suggest that nonoptimal plant development during vegetative and early reproductive growth stages may be ameliorated. The increases in soybean yield seen in this study may encourage the adoption of nonpuddling rice production under the rice-soybean rotation system in Japan.

show abstract

Adaptive Sliding Mode Path Tracking Control of Unmanned Rice Transplanter

Shang

et al. 2022

Agriculture

View full text Add to dashboard Cite

To decrease the impact of uncertainty disturbance such as sideslip from the field environment on the path tracking control accuracy of an unmanned rice transplanter, a path tracking method for an autonomous rice transplanter based on an adaptive sliding mode variable structure control was proposed. A radial basis function (RBF) neural network, which can precisely approximate arbitrary nonlinear function, was used for parameter auto-tuning on-line. The sliding surface was built by a combination of parameter auto-tuning and the power approach law, and thereafter an adaptive sliding controller was designed. Based on theoretical and simulation analysis, the performance of the proposed method was evaluated by field tests. After the appropriate hardware modification, the high-speed transplanter FLW 2ZG-6DM was adapted as a test platform in this study. The contribution of this study is providing an adaptive sliding mode path tracking control strategy in the face of the uncertainty influenced by the changeable slippery paddy soil environment in the actual operation process of the unmanned transplanter. The experimental results demonstrated that: compared to traditional sliding control methods, the maximum lateral deviation was degraded from 17.5 cm to 9.3 cm and the average of absolute lateral deviation was degraded from 9.1 cm to 3.2 cm. The maximum heading deviation was dropped from 46.7° to 3.1°, and the average absolute heading deviation from 10.7° to 1.3°. The proposed control method not only alleviated the system chattering caused by uncertain terms and environmental interference but also improved the path tracking performance of the autonomous rice transplanter. The results show that the designed control system provided good stability and reliability under the actual rice field conditions.

show abstract

Reduction of nitrogen, phosphorus, and suspended solids effluent loads from paddy fields by transplanting into retained ponding water using a GNSS-controlled rice transplanter

Cited by 3 publications

References 1 publication

Greenhouse gas emission, water quality and straw decomposition as a function of rice postharvest field management

Greenhouse gas emission, water quality and straw decomposition as a function of rice postharvest field management

Non-puddling rice cultivation increases subsequent soybean yield in a rice–soybean rotation system

Adaptive Sliding Mode Path Tracking Control of Unmanned Rice Transplanter

Contact Info

Product

Resources

About