Study On Efficient Utilization Of Blueberry Planting Water Resources In Ganyu Hilly Area

Agricultural development plays an important role in maintaining national economic development,food security and social stability.Water resource is an important factor restricting agricultural development,especially for the hilly areas with high terrain and easy to cause drought and water shortage,the efficient utilization of water resource is particularly important.The blueberry industry in the hilly area of Ganyu has developed strongly and gradually become the pillar industry in the hilly area of Ganyu as well as the main source of income for farmers to get rich.With the continuous expansion and upgrading of the blueberry industry,it is necessary to further promote the improvement of the quality,efficiency and yield of the blueberry industry.The problems of water shortage and low utilization efficiency have gradually become the bottleneck for the development of the blueberry planting industry in the hilly region of Gannu.In view of the shortage of water in the development of blueberry industry in the hilly region of Ganyu,this paper carried out research on the efficient utilization of water resources to support the development of blueberry industry in the hilly region of Ganyu from two aspects of "source" and "reduce expenditure",which is of great significance.The main research contents of this paper include the following two aspects:(1)In order to make full use of local surface runoff and realize the utilization of rainwater resources,according to the geomorphic characteristics of hilly region,a relationship model between catchment slope area A1～reservoir volume V0～irrigated blueberry area A2 was established.The model was used to simulate and analyze the volume of the reservoir under the constraints of maximum water storage,minimum external supplementary water displacement and maximum utilization of the reservoir at different rainfall levels.The optimal ratio K between the optimal catchment area and the planting area of blueberry was given to optimize the volume of the reservoir.In order to alleviate the problems of drought and water shortage and high cost of water lifting in the hilly area of Gansu elm,the construction of rainwater storage and utilization project provides a basis.(2)On the basis of fully analyzing the characteristics of water and fertilizer in different growth stages of blueberry,efficient water-saving irrigation technology and water and fertilizer integration technology were adopted to effectively improve the utilization efficiency of water resources in the planting process of blueberry.On this basis,using the optimization technology of pipe network water transmission and irrigation in hilly area and aiming at the minimum annual cost of pipe network per mu,the layout form of pipe network optimization is put forward.It provides a theoretical basis for the optimization of blueberry water and fertilizer integrated pipeline network engineering in the hilly and mountainous areas of Ganyu.Main research conclusions:(1)In the construction of the surface runoff storage and utilization project for blueberry planting in hilly areas,the scale of the reservoir is often limited due to the restriction of topographic conditions and the impact of such factors as the area of the reservoir,forming a complex interrelated relationship between the catchment slope area A1～the volume of the reservoir V0～the irrigated blueberry area A2.Based on the analysis of the water demand characteristics of blueberry,this paper provides a lookup table(F igure)for the optimal ratio K value between the catchment area and the planting area of blueberry in different level years,aiming at maximizing the water utilization efficiency of the reservoirs,which can be used for the construction of blueberry planting reservoirs in Ganyu District.(2)In the high-efficiency utilization of water resources for blueberry planting in hilly areas,it is very necessary to construct high-efficiency water-saving irrigation projects mainly based on pipeline irrigation.Based on the optimization of low-pressure pipeline irrigation pipe network system,this paper analyzes the different directions of branch and pipe water distribution,and draws the conclusion that the annual cost per mu of branch and pipe two-way water distribution is lower than that of branch and pipe one-way water distribution.It can be used as a reference for the design of pipe network system for the efficient utilization of water resources for blueberry planting in the hilly area of Ganyu.(3)Based on the efficient use of water resources,through the analysis of water conservation,land benefit,increase the planting area,yield and other indexes,it is concluded that the promote efficient use of water resources project construction will be beneficial to Gan Yu hilly blueberry industry development impact effects:1)The irrigation guarantee rate of the existing planting area of blueberries will be increased from the current 60 percent to 90 percent;2)After the efficient utilization of water resources,the planting area of blueberry can be expanded by 15,400 mu without increasing the carrying capacity of water resources;3)Saving irrigation cost of 718,100 yuan/a;4)The output of blueberry can be increased by 24,700 t/a;5)The total output value of blueberries increased by 1.727billion yuan/a.Increase income and become rich for the realization of farmers to provide security.The above research results can be directly applied to the design of blueberry planting water resource efficient utilization system in the hilly area of Ganyu,and promote the further expansion and strengthening of the blueberry industry in Ganyu,which has certain practical and engineering practical significance.