Effects Of Brackish Water Irrigation On Soil Water And Salt And Water Consumption Characteristics Of Lycium Barbarum And Research On Planting Technology

The soil salinization and the sharp decrease of the amount of water from the Yellow River in Inner Mongolia Hetao Irrigated Area have seriously restricted the agricultural development in the irrigated area.This article in the red guard irrigation field test area in Inner Mongolia San Hu river under the Chinese wolfberry cultivation of brackish water irrigation field experiments,through studying different brackish water irrigation amount and salinity distribution of soil water and salt migration rule,the influence of the Chinese wolfberry water consumption characteristics and yield,put forward the suitable for local Chinese wolfberry cultivation mode of brackish water use integration technology,to provide theoretical basis for safe use of brackish water irrigation in the irrigation area of Chinese wolfberry and technical reference.The main conclusions of this paper are as follows:（1）Under brackish water irrigation,the water content in the 0-40cm soil layer is the smallest,the water content in the 40-60cm soil layer is decreasing with a range of12.31%-36.73%,the water content in the 30-50cm soil layer is the largest,with an average of 23.67%,and the water content in the 80-100cm soil layer is relatively stable.Under high water（270mm）treatment,the soil moisture content in the whole growth period was the highest,which was increased by 23.69%and 10.54%under low water（W1,150mm）and medium water（210mm）treatment,respectively.There was no significant difference in soil water content between fresh water（0.608g/L）and low salinity（3g/L）treatments,with a range less than 2.50%.When the salinity of irrigation water was greater than 3g/L,the influence of salinity began to be prominent.At the beginning of flowering,the soil water content decreased slightly,and at the beginning of fruit expansion,the soil water content decreased rapidly,with a range of10.51%～42.34%,and at the later growth period,the soil water content increased to some extent.（2）Under the same salinity,soil salinity decreased first and then increased with the increase of irrigation amount.Compared with low water（150mm）and high water（270mm）treatments,soil salinity decreased by 7.36%and 14.62%,respectively.Under the same irrigation amount,soil salt content increased with the increase of salinity.The average soil salt content of medium water with low salinity（3g/L）was3.77g/L.Compared with the same irrigation amount,the soil salt content of fresh water treatment is no more than 3%,which is obviously lower than that of other treatments.Medium water with low salinity（210mm,3g/L）can be used as an alternative water for irrigation of local fresh water resources.（3）The average water consumption intensity of each treatment from germination stage to flowering stage was 2.45mm/d.Under the same salinity,water consumption intensity increased by 22.64%and water use efficiency decreased by 12.14%under high water（270mm）compared with low water（150mm）treatment.The fresh and dried fruit yield of Lycium barbarum under medium water treatment was the highest,which was increased by 28.3%,26.03%and 6.21%,2.83%,respectively,compared with low water treatment and high water treatment.Under the same irrigation amount,crop water consumption and water consumption intensity were inhibited to a certain extent with the increase of salinity,and the variation was less than 2.5%.The water use efficiency of high salinity（6g/L）was 23.97%lower than that of fresh water treatment.With the increase of salinity in medium water（210mm）,the fresh fruit yield of Lycium barbarum decreased,while the dry fruit yield increased first and then decreased.Medium water salinity（W2S2）treatment had the highest dry fruit yield.（4）The soil water content of the local conventional mode（D）was higher than that of the integrated mode（A）,and the soil water content of the local conventional mode（D）was 15.82%higher than that of the integrated mode during the whole growth period.Compared with the local soil salt content under different modes,the soil salt content under the integrated mode was 9.86%lower than that under the local soil salt content.The fresh and dry weight yields under the integrated mode were790.32kg/mu and 180.16kg/mu,respectively.The fresh weight yield under the integrated mode was 6.06%lower than that under the local soil salt content,and the dry weight yield was 0.83%higher than that under the local soil salt content.WUE under the integrated tillage system was 4.94kg·(mm/hm^-2),1.35%higher than that under the local conventional tillage system.Compared with the local model,the integrated model reduced the investment by 14%,reduced the consumption of fresh water by 60m3/hm2,and increased the total revenue by 56.45%.Considering the effects of brackish water on soil water-salt environment,growth effect of Lycium barbarum,yield and water consumption characteristics,it was determined that brackish water irrigation with salinity less than 3g/L was safe and feasible under the local irrigation amount of 210mm.