scholarly journals Evaluation of Water-Storage and Water-Saving Potential for Paddy Fields in Gaoyou, China

Water ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 1176 ◽  
Author(s):  
Chuanjuan Wang ◽  
Shaoli Wang ◽  
Haorui Chen ◽  
Jiandong Wang ◽  
Yuan Tao ◽  
...  
Keyword(s):  
Southern China ◽  
Financial Burden ◽  
Water Shortage ◽  
Water Saving ◽  
Paddy Fields ◽  
Balance Model ◽  
Agricultural Water ◽  
Average Water ◽  
Agricultural Water Resources ◽  
Water Fee

In China, the stress on agricultural water resources is becoming increasingly severe. In response, a range of water-saving irrigation (WSI) policies and practices have been promoted to improve irrigation efficiency. In this study, a water-balance model in paddy fields was calibrated and validated using a 2-year field experimental dataset collected from an irrigated area in Gaoyou, China, in 2014–2015. The model was used to assess the effects of WSI practices and provides options for implementing water-price reforms. Results show that paddy fields effectively retain rainfall with utilization rates greater than 70% for both shallow wet irrigation (SWI) and shallow humidity-regulated irrigation (SHRI) scenarios. The estimated average water-saving rates from 1960 to 2015 using SWI and SHRI are 33.7% and 43%, respectively, which represent considerable reductions in water consumption. The benefits of WSI practices combined with water management policies are also evident. For example, conversion of irrigation water to industrial water yields a 3-year average water fee of 205.2 yuan/ha using SWI and 20.6 yuan/ha using SHRI, considerably reducing farmers’ financial burden for agricultural water supplies. In conclusion, we recommend the adoption of SWI and SHRI practices in southern China as a means of partially alleviating China’s water-shortage problem.

scholarly journals Mulching as water-saving technique in dryland agriculture: review article

2019 ◽  
Vol 43 (1) ◽  
Author(s):  
Mohammad Abdul Kader ◽  
Ashutus Singha ◽  
Mili Amena Begum ◽  
Arif Jewel ◽  
Ferdous Hossain Khan ◽  
...  
Keyword(s):  
Arid Regions ◽  
Review Article ◽  
Water Saving ◽  
Future Research ◽  
Agricultural Water ◽  
Plastic Mulch ◽  
Dryland Agriculture ◽  
Crop Cultivation ◽  
Agricultural Water Resources ◽  
Semi Arid

Abstract Agricultural water resources have been limited over the years due to global warming and irregular rainfall in the arid and semi-arid regions. To mitigate the water stress in agriculture, mulching has a crucial impact as a water-saving technique in rain-fed crop cultivation. It is important mainly for preserving soil moisture, relegating soil temperature, and limiting soil evaporation, which affects the crop yield. Mulching has many strategic effects on soil ecosystem, crop growth, and climate. Mulch insulates the soil, helping to provide a buffer from cold and hot temperatures that have a crucial activity in creating beautiful and protected landscapes. This study has accumulated a series of information about both organic and plastic mulch materials and its applicability on crop cultivation. Moreover, future research potentials of mulching with modeling were discussed to quantify water loss in agriculture.

Agricultural Water Conservation Cost Control Mechanism of the Pre-Coastal City Based on Design Innovation

2014 ◽  
Vol 644-650 ◽  
pp. 5962-5965
Author(s):  
Peng Peng Zhao ◽  
Fan Rui Meng
Keyword(s):  
Water Conservation ◽  
Life Cycle Cost ◽  
Innovation Process ◽  
Water Shortage ◽  
Water Saving ◽  
Design Stage ◽  
Agricultural Water ◽  
Coastal City ◽  
Investment And Financing ◽  
Design Innovation

Water-saving irrigation is the livelihood of the people to solve the problem of coastal city agriculture water shortage of water conservancy projects. To investigate the situation of the construction of agricultural water-saving facilities in Tianjin, first ,this paper analyzes the using costs, including running maintenance costs. According to the life-cycle cost theory, it is an important means to control using costs in the infrastructure construction engineering design stage. Then the paper will analyze the complexity of the demand of urban water-saving irrigation and propose that designing innovation is the key to control the complex using costs. Finally , the paper will analyze The effect of investment and financing model of design innovation process. On the one hand, the mode of investment and financing will help to solve the construction funding gap; On the other hand, it will affect water-saving cost pre-control in different degrees.

scholarly journals Agricultural Water Use Efficiency and Rebound Effect: A Study for China

2021 ◽  
Vol 18 (13) ◽  
pp. 7151
Author(s):  
Hang Xu ◽  
Rui Yang ◽  
Jianfeng Song
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Causal Effect ◽  
Rebound Effect ◽  
Water Shortage ◽  
Water Saving ◽  
Water Withdrawal ◽  
Agricultural Water ◽  
Agricultural Water Use ◽  
Use Efficiency

Agricultural water use accounts for the largest proportion of water withdrawal, so improving agricultural water use efficiency is an important way to alleviate water shortage. However, the expected water saving by the improved agricultural water use efficiency may be offset by the rebound effect, which means the goal of water saving by improving agricultural water use efficiency is not achieved. Based on the definition of the rebound effect of agricultural water use, this paper first uses a fixed model to measure the causal effect of agricultural water use efficiency on agricultural water use to analyze the agricultural water rebound effect, then analyses the heterogeneity and mechanism of the effect of agricultural water use efficiency on agricultural water use with the panel data from 30 provinces or cities in China from 2000 to 2017. The results show that, firstly, the agricultural water use efficiency has a significant negative effect on agricultural water use, but the average agricultural water rebound effect is 88.81%. Secondly, the effect of agricultural water use efficiency on agricultural water use is heterogeneous, in which the improvement of agricultural water use efficiency in humid or major grain-producing areas will have a lower agricultural water rebound effect. Finally, agricultural water use efficiency can affect agricultural water use through planting area and planting structure. An increase in agricultural water use efficiency will expand the planting area to increase water use. However, this will change the planting structure to decrease water use. The implication for agricultural water management is that the irrigation agricultural scale has to be controlled under the condition of available water resource, while improving agricultural water use efficiency.

scholarly journals REVIEW: PRODUKTIVITAS AIR DALAM PENGELOLAAN SUMBER DAYA AIR PERTANIAN DI INDONESIA

2019 ◽  
Vol 5 (3) ◽  
pp. 65-72 ◽  
Author(s):  
Farida Farida ◽  
Dasrizal Dasrizal ◽  
Trina Febriani
Keyword(s):  
Food Security ◽  
Water Resources ◽  
Renewable Resources ◽  
Agricultural Sector ◽  
Water Productivity ◽  
Paddy Fields ◽  
Environmental Damage ◽  
General View ◽  
Agricultural Water ◽  
Agricultural Water Resources

Sumber daya air memiliki peran yang besar bagi sektor pertanian. Air sebagai renewable resources digunakan untuk memenuhi produksi pertanian. Peningkatan produktivitas air pertanian memiliki peran yang penting dalam menghadapi kelangkaan dan kopetisi penggunaan sumber daya air, pencegahan terhadap kerusakan lingkungan dan ketahanan pangan. Tulisan ini bertujuan untuk melihat bagaimana kuantitas dan produktivitas sumber daya air pertanian di Indonesia secara umum. Berdasarkan data luas pertanian Indonesia tahun 2009-2013, luas sawah irigasi di Indonesia mencapai 4,81 juta Ha setara dengan laju peningkatan 9%. Apabila sawah irigasi ini dibandingkan dengan luas baku irigasi sebesar 12.335.832 Ha, maka persentase sawah irigasi hanya sekitar 38%, kondisi ini menggambarkan bahwa pemanfaatan air irigasi masih relatif rendah. Dilihat dari hasil data ketersedian air yang ada di 7 pulau-pulau besar yang ada di Indonesia Pulau Jawa mengalami permasalahan paling tinggi  dimana terlihat dari tingginya tingkat kebutuhan air tidak sebanding dengan ketersediaan air yang ada, sehingga akan berdampak kepada ketahanan pangan dan juga kondisi kesejahteraan masyarakat khususnya petani, dengan hal tersebut ada strategi dalam  dalam upaya peningkatan  penyediaan air dan produktivitas air yaitu dengan cara konservasi ekosistem hidrologis daerah aliran sungai (DAS), peningkatan efisiensi pemanfaatan air pertanian, redistribusi aset infrastruktur irigasi dengan mekanisme pendanaan dan insentif yang sesuai serta adanya harmonisasi antar sektor dan wilayahsetempat dalam pengelolaan sumber daya air pertanian.Water resources have a large role for the agricultural sector. Water as renewable resources is used to fulfill agricultural production. Increasing productivity of agricultural water has an important role in dealing with scarcity and competition in the use of water resources, prevention of environmental damage and food security. This paper aims to have a general view of quantity of agricultural water resources in Indonesia. Based on data on Indonesia's agricultural area in the year 2009-2013, irrigated paddy fields in Indonesia reached 4.81 million Ha, equivalent to the rate of 9% increase. If this irrigated rice field is compared to the irrigated raw area of 12,335,832 Ha, then the percentage of irrigated paddy fields is only around 38%, this condition illustrates that the utilization of irrigation water is still relatively low. Judging from the results of water availability data in 7 major islands in Indonesia that Java Island experiences the highest problems, which can be seen from the high level of water demand that is not proportional to the availability of water, so that it will affect food security and the condition of community welfare especially farmers, with this in mind there is an inner strategy in an effort to increase water supply and water productivity, namely by conserving watershed hydrological ecosystems , increasing efficiency of agricultural water utilization, redistributing irrigation infrastructure assets with appropriate funding mechanisms and incentives and harmonizing between sectors and regions in the management of agricultural water resources.

scholarly journals Response of Vertical Migration and Leaching of Nitrogen in Percolation Water of Paddy Fields under Water-Saving Irrigation and Straw Return Conditions

Water ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 868 ◽  
Author(s):  
Chengxin Zheng ◽  
Zhanyu Zhang ◽  
Yunyu Wu ◽  
Richwell Mwiya
Keyword(s):  
Vertical Migration ◽  
Growth Stage ◽  
Nitrogen Leaching ◽  
Water Saving ◽  
Paddy Fields ◽  
N Leaching ◽  
Leaching Losses ◽  
Leaching Loss ◽  
Straw Return ◽  
Percolation Water

The use of water-saving irrigation techniques has been encouraged in rice fields in response to irrigation water scarcity. Straw return is an important means of straw reuse. However, the environmental impact of this technology, e.g., nitrogen leaching loss, must be further explored. A two-year (2017–2018) experiment was conducted to investigate the vertical migration and leaching of nitrogen in paddy fields under water-saving and straw return conditions. Treatments included traditional flood irrigation (FI) and two water-saving irrigation regimes: rain-catching and controlled irrigation (RC-CI) and drought planting with straw mulching (DP-SM). RC-CI and DP-SM both significantly decreased the irrigation input compared with FI. RC-CI increased the rice yield by 8.23%~12.26%, while DP-SM decreased it by 8.98%~15.24% compared with FI. NH4+-N was the main form of the nitrogen leaching loss in percolation water, occupying 49.06%~50.97% of TN leaching losses. The NH4+-N and TN concentration showed a decreasing trend from top to bottom in soil water of 0~54 cm depth, while the concentration of NO3−-N presented the opposite behavior. The TN and NH4+-N concentrations in percolation water of RC-CI during most of the rice growth stage were the highest among treatments in both years, and DP-SM showed a trend of decreasing TN and NH4+-N concentrations. The NO3−-N concentrations in percolation water showed a regular pattern of DP-SM > RC-CI > FI during most of the rice growth stage. RC-CI and DP-SM remarkably reduced the amount of N leaching losses compared to FI as a result of the significant decrease of percolation water volumes. The tillering and jointing-booting stages were the two critical periods of N leaching (accounted for 74.85%~86.26% of N leaching losses). Great promotion potential of RC-CI and DP-SM exists in the lower reaches of the Yangtze River, China, and DP-SM needs to be further optimized.

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