Drainage optimization of paddy field watershed for diffuse phosphorus pollution control and sustainable agricultural development

2021 ◽  
Vol 308 ◽  
pp. 107238
Author(s):  
Lianhua Liu ◽  
Wei Ouyang ◽  
Hongbin Liu ◽  
Jianqiang Zhu ◽  
Xianpeng Fan ◽  
...  
2013 ◽  
Vol 726-731 ◽  
pp. 1817-1822
Author(s):  
Fu Guo Qiu ◽  
Yu Wang

This paper reviewed the development of bioretention systems with a focus on its abilities to control phosphorus in stormwater. Bioretention systems takes full advantage of the matrix-microbes-plant system with simultaneous removal of organic matter, nitrogen, phosphorus, total suspended solids (TSS), heavy metal, and pathogens. But phosphorus removal has been found inconsistent in bioretention systems, which can be observed phosphorus leaching in some systems. The phosphorus forms in stormwater, the distribution and transfer pathways of phosphorus in bioretention system need to be figured out and simulated in order to solve the phosphorus leaching. Some new matrix materials, such as aluminum-based water treatment residual, were also employed to adsorb and trap the phosphorus in stormwater. The latest study progress and further research needs of bioretention systems were summarized.


10.1038/88091 ◽  
2001 ◽  
Vol 19 (5) ◽  
pp. 429-433 ◽  
Author(s):  
Serguei P. Golovan ◽  
M. Anthony Hayes ◽  
John P. Phillips ◽  
Cecil W. Forsberg

2012 ◽  
Vol 518-523 ◽  
pp. 1406-1411 ◽  
Author(s):  
Wei Bian ◽  
Lu Guang Wang ◽  
Huan Zhen Zhang ◽  
Jing Fei Wang ◽  
Zai Feng Tian ◽  
...  

Aquaculture can bring excess phosphorus to lakes which causing eutrophication. Figuring out the amount of phosphorus is meaningful to water pollution control. This study aims to clarify how much phosphorus is produced by aquaculture in Baiyangdian Lake each year. A phosphorus balance equation which is based on conservation of matter is established and used to calculate the input and output phosphorus carefully of an experimental field during a breeding cycle. Six parameters which are little fish, adult fish, feed, plants, sediment deposition and release are included in the equation. By the equation, the document gets a model: Q(x)=0.033x, which shows that breeding every 1kg grass carp, there will be 0.033kg phosphorus into the water. As a result, the phosphorous pollution load of aquaculture in Baiyangdian Lake is 302.6 t/a.


2021 ◽  
Vol 29 (4) ◽  
pp. 2225-2242
Author(s):  
Siti ‘Aisyah Baharudin ◽  
Hayyan Nassar Waked

Malaysia’s paddy sector frequently relies on machinery in its activities, from land preparation until harvesting. However, the shortfall of meeting domestic demand, ineffective use of machinery, mismanagement, and technical inefficiency were among the sector’s challenges. This study analyses the socio-economic effect on machinery and technical efficiencies in Malaysia’s Muda Agricultural Development Authority (MADA) and Integrated Agricultural Development Area Barat Laut Selangor (IADA BLS) paddy areas. Qualitative data were collected using a face-to-face interview. The results confirmed that MADA respondents were highly trained, more educated, and more efficient in using machinery in the agriculture sector than IADA BLS. The same goes for MADA’s productivity, energy outputs, machinery efficiency, labour, and technology use, which were higher than IADA BLS. However, inadequate planning and managing farm activities led to poor paddy field conditions, including insufficient water supply system, irregularly shaped paddy field plots, and increasing difficulties in handling paddy diseases and maintaining the machinery. These challenges resulted in a frequent interruption of paddy production activities, incurring additional costs, decreasing profit, and jeopardising the farmers’ financial status. Therefore, it is recommended to use types of machinery that fit a particular purpose in terms of cost and technology and ensure the required services are carried out on time to maximise machinery efficiency. On the other hand, technical efficiency’s main challenges were the high operation cost and increasing fossil fuel use, combined with a lack of government subsidies. Research and development in agricultural energy use, environment, and government subsidies could decrease production costs and improve paddy production.


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