Abstract
Water-saving strategies play an important role in improving the resilience of water scarcity in arid and semi-arid areas. This paper has compared the advantages and disadvantages of four kinds of water-saving irrigation methods commonly used in arid/semi-arid areas: rainwater harvesting irrigation, plastic film mulching technology, deficit irrigation, and alternate furrow irrigation. The finding of this study is that biological water-saving which can improve the biological drought tolerance is more cost-effective of further study than the technological water-saving. It can be seen that the latter two (biological water-saving irrigation measures) have lower cost, stronger operability and more promising development prospects. Im addition, future research is suggested to focus more on automatic intelligence to pursue accurate irrigation.
Highlights
With the development of the human economy and population explosion, the proportion of fresh water resources that can be directly available for agricultural production keeps decreasing [1]
Due to the different water requirements of different crops, in order to prevent the development from moderate water deficit to serious water shortage in production, Each region should carry out research on different crops and soils, so as to establish an optimized crop water deficit evaluation system[16], and the gradual development from extensive irrigation to precision irrigation has become the focus of research[17].Currently, the evaluation methods of crop water deficit is much from the ecological perspective, but in order to improve the drought resistance of crops, more scholars hope affecting crop genetic material[15], at the same time, under the condition of without affecting crop yields, regulated deficit irrigation will affect the crop of protein, sugar, fat and other components will become the direction of further research[18]
The purpose of this study is to provide references for selecting water-saving irrigation technologies according to local conditions
Summary
With the development of the human economy and population explosion, the proportion of fresh water resources that can be directly available for agricultural production keeps decreasing [1] This can lead to the expansion of arid areas, the intensification of drought, soil erosion, and ecological deterioration. It has been increasingly important to adopt the sustainable approach to scientifically allocate water, improve crop water productivity, and reduce soil water demand pressure in arid and semi-arid regions. Within this context, to utilize water resources more efficiently and balance the yield and economic benefits, various water-saving irrigation technologies have been studied as valuable strategies in arid areas [2]. This paper refers to a large number of research literatures related to water-saving and drought-resistant irrigation, summarizes common water-saving irrigation methods in arid/semi-arid areas, and proposes future research directions
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