Study On Distribution Characteristics Of Soil Water And Salt With Brackish Water Irrigation Zhanhua Brumal Jujube And Its Quality

Zhanhua, as the hometown of Chinese winter date, is famous for its rich production of jujube. In addition, this region is also rich in salt water resources underground. The high level of underground water leaded to soil salinization, which has a bad influence in the production of winter jujube. In this work, investigation of local geology, hydrology, meteorology, jujube production, and establish micro-sprinkler and drip irrigation of jujube with brackish water, and study on distribution characteristics of water and salt, and using the HYDRUS software to establish soil salt and water distribution model. After the fruit matures, and study on its quality and yield. In combination with evaporation and rainfall, and formulate irrigation scheme, and respectively forecast analysis that distribution characteristics of soil water and salt with micro sprinkler and drip irrigation of brackish water under P = 50% normal year. Consideration the distribution characteristics of soil water and salt, and fruit quality and yield, which established brackish water micro-sprinkler and drip irrigation scheme. The main contents and conclusions are as follows:(1) Established the micro sprinkler and drip irrigation model, and study on geography, geology, underground salt water resources, climatic conditions, and jujube yield and quality. The level of shallow groundwater rang of 1.5- 3.0 m, and the groundwater salinity more than 5 g/L, and local area more than 10 g/L. Uneven seasonal distribution of precipitation, and evaporation capacity more than 260 mm, monthly rainfall less than 50 mm in may and June of P = 50% normal year, and easily going to be a famine which effects jujube production. In July and August, the rainy season is coming, and rainfall is plentiful.(2) Using less than 3.0 g/L of brackish water micro sprinkler and drip irrigation jujube tree, and monitoring the distribution of water and salt in growth period of jujube. In June, water content of the surface soil is the lowest among other months, and the salt content is the highest. In August, water content of the surface soil is the highest among other months, and the salt content is the lowest. In October, surface soil moisture content is lower than that in August, and salt content is higher. From the range of 0-40 cm of soil layer, sulfate ion concentration of the surface soil is the highest among other anions, and calcium ion concentration of the surface soil is the highest among the others.(3) On the basis of soil water and salt movement equation, and related research achievements of previous scholars, and using the software of HYDRUS, and based on detection of hydrogeological data in the study area to determine the values of various parameters in the model, and upper and lower boundary conditions are determined in combination with the practical situation of this area, and input data, through parameter debugging, and compared with the measured values. At last, establish the numerical model of field soil water and salt to model the move of water and salt.(4) Production, total soluble solid, edible rate, single fruit weight, and stone heavy of jujube under brackish water micro sprinkler, drip irrigation and local traditional irrigation mode were tested, and analysis quality and production of jujube. Brackish water micro sprinkler and drip irrigation has improved the quality of jujube compared with traditional irrigation mode, and the micro sprinkler irrigation can improve the growth environment of jujube, and total soluble solid content of jujube with micro sprinkler is higher than that of drip irrigation, and the quality improved.(5) According to the results of brackish water irrigation, and combined with the practical situation of the field, and designed micro sprinkler and drip irrigation scheme of jujube. Under the distribution data of soil and salt from the year of 2013 to the year of 2015, and the move model of water and salt, and combining with the field evaporation and rainfall, and analysis the data to predict the field soil moisture and salt distribution of P = 50% normal year. At last, to achieve water-saving irrigation with brackish water, and improve the quality of jujube, and increase the production of jujube, and survive the salinization land, brackish water of micro-irrigation system of ecological agricultural irrigation was established, which can be used to guide the local production of jujube and improve the economic, social and environmental benefits.