Study On The Impact Of Saline Water With Different Degree Of Materialization On Groeth

The increasing shortage of water resources is the main limiting factor of agriculture in Tian jin.Study on Agronomic Characters and yield of Winter Wheat by using brackish water irrigation.The brackish water irrigation field experiment with six treatments(totally six treatments:CK,fresh water irrigation;S1,direct irrigation with 1g/Lsalty water;S2,direct irrigation with 2g/Lsalty water;S3,direct irrigation with 3g/Lsalty water;S4,direct irrigation with 4g/Lsalty water;S5,direct irrigation with 5g/Lsalty water)brackish water irrigation was conducted in 2014-2015,2015-2016 year.Through the water consumption of winter wheat was controlled the water-salt regulation.According to the results of the 2014-2015 test study,using 3 ~ 5 g/Lsalty brackish water and fresh water,brackish round irrigation test in2015-2016 year.Through the observation of yield and agronomic traits,soil water and salt.The relationship between wheat yield and soil conditions can be ensure the brackish water safe,which can provide guidance for the brackish water irrigation of wheat in Tianjin.The conclusion are the following several aspects:(1)The effects of different salt concentration brackish water on the agronomic traits of winter wheat showed that the plant height and leaf area of wheat increased with the increase of salinity salinity,among which 4g / L and 5g / L micro The plant height decreased by17.68%,23.84% and the leaf area decreased by 29.12% and 36.31%,respectively.The results showed that the leaf thickness of winter wheat increased with the increase of 3g / L brackish water.The increase of the mineralization rate of the brackish water showed that the water intensity increased,and the soil osmotic potential was increased under 1g / L and 2g / L salt water stress,and the soil moisture was absorbed by the root system.Under the salt stress,the dry matter transferred to the wheat grain,thus increasing the wheat yield,and with the further increase of salt,when the irrigation 4g / L and 5g / L brackish water,the wheat yield decreased significantly.(2)The daily water consumption intensity of winter wheat increased from the jointing stage,the water consumption intensity at heading stage was the highest,and the water intensity of the wheat was gradually decreased after the ripening period.The effect of brackish salinity on the water consumption of wheat was not obvious after brackish water irrigation at the jointing stage of winter wheat,and the average water consumption was4.42 mm · d-1.With the growth and development of wheat into the heading period,the wheat water demand increased to the maximum,different salinity brackish water showed the trend of increasing first and then decreasing.With the increase of irrigation salinity water salinity,the growth of irrigation year,the accumulation of soil salinity,the effect of water stress on crops is more obvious.In the treatment of salt water(S2,S3,S4),the depth of salt accumulation increased with the increase of irrigation amount,and the soil salinity was accumulated in the treatment of salt water(S2,S3,S4)And the degree of salinity increases with the increase of salinity.The salinity of different treatments is 4.08%,17.65%,68.42%and 69.90%(3)There were significant differences in wheat yield components between continuous irrigation brackish water and wheel irrigation,continuous irrigation was avoided under brackish water irrigation.In the case of irrigation water,the spike length and spikelet number of wheat were smaller than those of salt stress.The brackish water was not significantly different in different periods.However,irrigation had a great effect on grain weight of wheat and reduced grain weight.There were significant differences in the effects of brackish water on the wheat irrigation in the two irrigation periods,but there was no significant difference in the wheat yield components between the two irrigation groups.On the whole,wheat salty treatment had little effect on wheat yield components,and salty salty treatment had a greater effect and inhibited crop growth.The salinity of the soil under different rounds of irrigation was salty salty salty>fresh salty salty> salty salty fresh > salty fresh salty> fresh fresh salty>fresh salty fresh > salty fresh fresh,and salinity increased with the salinity of irrigation water And increased.In the selection of brackish water irrigation,should try to use 3g / L brackish water,so that irrigation water salinity is too high on the soil salty rate has a stronger cumulative effect,in the two irrigation should be used,two consecutive irrigation on the soil salty rate of a greater impact,not conducive to crop growth,but also to increase the soil salinity,is not conducive to soil use.Under the same irrigation amount,the water use efficiency of wheat under different irrigation conditions had different effects: 3g / L brackish water had the highest water use efficiency,and the comprehensive yield and water and salt distribution rule could be determined.Under the condition of light treatment,the system of brackish water wheel irrigation is better.