| Objective:Processing tomato is one of the important economic crops in Xinjiang,but the increasing shortage of water resources and the contradiction between supply and demand restrict the productivity of processing tomato.Drip irrigation under the mulch can keep the soil in the root zone of crops in a better water condition,which is conducive to the absorption of water by the roots of crops.However,irrigation with brackish water can easily lead to the decrease of the osmotic potential of the soil solution in the root zone of crops,and water stress will occur,which will affect the growth of crops and lead to the reduction of production.Through the field experiment,this paper studied the effect of drip irrigation under the film of brackish water on the distribution of soil water and salt,the growth physiology and water consumption of processing tomato,the yield and quality,and sought for the irrigation system of drip irrigation under the film of brackish water suitable for the growth of processing tomato in this area,in order to better combine drip irrigation under the film with drip irrigation under the film of brackish water,so as to improve the sustainable drip irrigation under the film of brackish water in Xinjiang For theoretical and technical support.Methods:Using the field plot planting experiment,taking the processing tomato variety "Tunhe 9" as the research object,two factors of irrigation salinity and irrigation quota were set up,among which three irrigation water salinity levels were S1:1 g/L,S2:3 g/L and S3:5 g/L respectively,three irrigation quotas were W1:245 mm,W2:365 mm and W3:485 mm,9 treatments in total,each treatment was set with 3repetitions.Results:(1)Under the condition of mulching and brackish water drip irrigation,the change trend of soil water content in vertical direction showed that the water content decreased with the increase of depth in0~20cm,and increased with the increase of depth in 20~100cm,60~100 The distribution law of soil profile moisture content in cm range is the largest.The average soil moisture content in the whole growth period increases with the increase of irrigation water,and the soil moisture content in W3S1 treatment keeps a high level,while that in w1s3 treatment keeps a low level,with a difference of 2.65%(P<0.05);the soil salt content increases with the increase of irrigation mineralization,and the soil salt content gradually moves to the horizontal distance with the increase of irrigation water The drip irrigation belt gathered at 35 cm.(2)When the salinity of irrigation was 5g/L,the plant height,stem diameter and leaf area index of processing tomato were inhibited to a certain extent.The interaction of irrigation amount and salinity had a significant effect on the plant height,stem diameter and leaf area index of processing tomato(P<0.05).The results of path analysis showed that there was a significant positive correlation between plant height,stem diameter and leaf area.(3)Under different water and salt treatments,the water consumption of crops in each growth period increased with the increase of irrigation water,and the water consumption and water consumption modulus of each treatment decreased with the progress of growth period.Under the interaction of water and salt,the highest treatment of crop water consumption(W3S1)was 48.96% higher than the lowest treatment(W1S3).The results of two factor analysis of variance showed that the interaction of water and salt had a significant effect on the water consumption intensity of crops(P<0.01),but the salt did not reach a significant level(P>0.05).The water consumption intensity of each treatment increased first and then decreased with the development of growth period,and reached the maximum value of 7.30mm/d in flowering and fruit setting period.(4)Under the condition of film mulching and brackish water drip irrigation,the yield of the treatment with high water and low salinity(W3S1)was the highest,reaching 127613.2 kg·hm-2,and the yield of the treatment with low water and high salinity(W1S3)was the lowest,with a decrease of 27.81%.under the same irrigation salinity,the average yield decreased by 7.41~12.97% with the decrease of irrigation water.under the same irrigation amount,the average yield decreased by 3.07~15.54% with the increase of irrigation salinity.Two factor analysis of variance showed that water and salt had a significant effect on water use efficiency(P<0.01),water salt interaction did not reach a significant level(P>0.05),and the number of fruit per plant and the quality of fruit per plant had a significant effect on the yield of processing tomato(P<0.01).(5)The amount of irrigation had significant effect on Vc,lycopene and total sugar of processing tomato(P<0.01),total acid and soluble solids(P<0.05).Mineralization degree had a significant effect on Vc,lycopene and soluble solids of processing tomato(P<0.05),and a significant effect on total acid and sugar(P<0.01);under the same irrigation water level,Vc content,total sugar and total acid of processing tomato decreased first and then increased with the increase of mineralization degree,and the ratio of soluble solids and sugar acid increased with the increase of mineralization degree.Conclusion: After considering the distribution law of water and salt,the law of water consumption,growth physiology,yield and quality,it is considered that under the condition of mulched drip irrigation,the irrigation with the irrigation quota of 365 mm and the irrigation salinity of 1~3g/L of brackish water has little effect on the yield and quality of processing tomato,and saves the irrigation water resources.At the same time,it is considered that in the lack of fresh water resources In Xinjiang,which has abundant brackish water resources,it is safe and feasible to use 1~3g/L brackish water for drip irrigation of processing tomato. |
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