Project Research on using brackish water to irrigate for some coastal upland crops are conducted to meet undertaking in increasing the traditional water supply sources; reduce the pressure on traditional irrigation water sources; restructuring the irrigation sector.
MINISTRY OF EDUCATION MINISTRY OF AGRICULTURE AND TRANING AND RURAL DEVELOPMENT THUYLOI UNIVERSITY LE VIET HUNG RESEARCH ON USING BRACKISH WATER TO IRRIGATE FOR SOME COASTAL UPLAND CROPS Specialization: Irrigation and drainage engineering Code: 62 62 27 01 SUMMAZY OF TECHNICAL DOCTORAL THESIS HANOI, 2016 Thesis has been completed at Thuyloi university Advisor: A/Prof.Dr NGUYEN TRONG HA A/.Prof.Dr NGUYEN THI LAN HUONG Reviewer 1: Prof.Dr Le Dinh Thinh Reviewer 2: Asso.Prof.Dr Pham Viet Hoa Reviewer 3: Asso.Prof.Dr Doan Doan Tuan The thesis will be defended to the Examination Committee at Thuy Loi University, 175 Tayson str., Dongda, Hanoi, Vietnam On 26 th November, 2016 This thesis is delivered and available at the following libraries: - National Library - Library of Thuy Loi University INTRODUCTION Context of the study Vietnam is a country located on the East coast with over 3,000 km coastline, along the coast is the delta region, the coastal plains, where agricultural production has an important role in national economy Due to of climate change impact, food production in Vietnam has been being significantly risky, today Coping with climate change situation is the top priority of the government due to its negative impact on agricultural production and the livelihoods of people in recently, particular drought in South Centre; salinization in most of the coastal provinces, especially in Mekong Delta, leads to tens of thousands hectares of agricultural land become water shortages, etc The “Agriculture Restructuring” policy created focal points for enhanced agricultural water productivity in the context of increasing in water scarcity, thus, improve the flexibility of supply to encourage crop diversification, reducing rice acreage and water used crops; increasing acreage of with high economic value and less water consumption crops is to implement the restructuring the agricultural sector policy in the context of climate change Project "Research on using brackish water to irrigate for some coastal upland crops" are conducted to meet undertaking in increasing the traditional water supply sources; reduce the pressure on traditional irrigation water sources; restructuring the irrigation sector Objectifies of study - Determine the scientific basis of saline water irrigation by drip irrigation method to the growth and yield of corn and soybeans, and soil physical and chemical properties in Kim Son district, Ninh Binh province - Assess the possibility of using saline water to irrigate crops 3 Scope and objects of the study 3.1 Objects of the study - To study the effect of saline water using by drip irrigation methods to irrigate for soybean DT84 and corn LVN10, which are food crops and have been planting commonly in North Delta - The experiment soil is mixture sandy to lightly silt soil of the coastal area of the Red River Delta Testing soil is common soil in coastal areas of the Red River Delta and in central coast of Vietnam - Salt concentration of irrigation water includes levels: ≤ ‰ (irrigation water standard), ‰ and ‰ (double and triple to irrigation water standard) Water is taken from the Vac river , the salinity of the irrigation water is treated by diluting or supplementing to meet the research principles - Drip irrigation techniques was applied in the experiments 3.2 Scope of study - The coastal areas of North and North Central regions of tropical monsoon climate were selected as experiment areas Specifically, study area was at Kim Chinh commune, Kim Son district, Ninh Binh province which is located between the North and North Central of Vietnam - Research saline water irrigation for DT84 soybean and corn LVN10 which are grown in popularity on neutral alluvial soils in coastal areas - The study was conducted in seasons (2 spring seasons, rainy seasons and winter seasons) in two years (2012 and 2013) However, saline water irrigation would not be applied in two rainy seasons 4 Content of study - Identify the relationship between the salt concentration of irrigation water and the growth and yield of corn and soybean crops by applying the drip irrigation techniques - Determine the effect of using of saline water to irrigate to physical and chemical properties of the soil - Evaluate the possibility of using saline water to irrigate crops in limited freshwater resources condition and strong saline water areas Methodology - Numerous methods, which were used in this study, include inherited method, field experiments and statistical analysis method - The experimental and observation were carried out base on the current regulations The scientific and practical significances - Scientific significances: the thesis contributed to clarify the scientific basis of saline water irrigation for corn and soybean crops by drip irrigation techniques in the alluvil soil in Kim Son district, Ninh Binh province - Practical significances: The thesis had a great significance when proposing the possibility of saline water irrigation for corn and soybean crops in Kim Son district, Ninh Binh province The thesis is the premise for the saline water irrigation research in the other coastal areas of Vietnam and with different kinds of crops and freshwater water resources limitation - The thesis contributed to guide the appropriately use of saline water irrigation in sustainable agricultural production in Vietnam and reduce pressure fresh water sources in the context of climate change and sea level rise Achievements This research showed that saline water with ‰ salinity (ECiw = 2,8dS / m) can be used to irrigate, by drip irrigation methods, that did not significantly affect the growth and yield of corn LVN10 and soybean DT84 on alluvial soil in Kim Son district, Ninh Binh province On the northern coastal, north central and islands regions, under conditions of force majeure, ‰ salinity water (4.3 dS ECiw = / m) could be used by drip irrigation methods for maize LVN10 and soybeans DT84 Then, maize yield of maize and soybean was reduced