Study On Water Saving Effect Of Tomato In Greenhouse With Dithc On The High Ridge With Irrigation Under Film Mulch

According to the characteristics of furrow infiltration,a new Ditch on the high ridge with irrigation under film technology is proposed,which is to improve the traditional furrow irrigation technology,increase the ridge height and reduce the ditch depth,and combine with the laminating technology to facilitate lateral infiltration of furrow irrigation.In order to further explore the water-saving benefits in the greenhouse of Ditch on the high ridge with irrigation under film greenhouses,the effects of two furrow irrigation methods on the growth,yield,photosynthetic characteristics and water use eff-iciency of greenhouse tomato were explored by comparing Ditch on the high ridge with irrigation under film with conventional furrow irrigation.The law of Ditch on the high ridge with irrigation under film on soil water transport,in order to obtain a water-saving and efficient irrigation system suitable for greenhouse tomato furrow irrigation.The main results achieved are as follows:(1)Under the condition of Ditch on the high ridge with irrigation under film,due to the existence of horizontal water content gradient,the water supply in the ridge back is obvious,and under the mulching conditions,the water loss in the ridge back is less,the migration time of water in the ridge is increased,and the infiltration wetting front Flattened.DiUch on the high ridge with irrigation under film can improve the greenhouse microclimatc in the greinhousc.The average ternperature in the greenhouse is 6.73%higher than that of the conventional furrow irrigation,and the humidity is reduced by 7.01%.The effect of temperature rise and hum,dity reduction in the greenhouse is obvious.(2)Under Ditch on the high ridge withfirrigat on under film conditions,the difference of watcr-conserved growth stages of ereenhouse water causces difference in water consumption of greenhouse tomatoes.From the whole growth stage analysis,tomato consumed the most water in the fruiting stage,followed by flowering and fruiting,and the seedling stage was the least.Water consumption of tomato during the whole growth period,full irrigation(FCK treatment)>Regulated deficient irrigation at the seedling stage(FL1 treatment)>Regulated deficit irrigation during flowering and fruiting(FL2 treatment)>Degraded irrigation at the end of the period(FL3 treatment).(3)Plant height,diameter,leaf area index and dry matter accumulation of tomato in Ditch on the high ridge with irrigation under film were higher than that of conventional furrow irrigation.The Logistic model was used to obtain the growth model of the plant height of the tomato in the Ditch on the high ridge with irrigation under film greenhouse.The determination coefficient of the measured value and the simulated value were both above 0.99.The Gaussian model was used to obtain the growth experience model of the leaf area index of the tomato in the Ditch on the high ridge with irrigation under film greenhouse.The determination coefficient of the measured value and the simulated value were both above 0.98.Tomato in the seedling stage for water deficit treatment after rehydration,the compensation effect is obvious,can increase the chlorophyll a,b content,net photosynthetic rate,transpiration rate,stomatal conductance of tomato.(4)Compared with conventional furrow irrigation,Ditch on the high ridge with irrigation under film water use efficiency increased by about 16.81%.The irrigation water utilization efficiency of FL1 treatment(tendered deficit irrigation)was the highest in all treatments,and the vitamin C and lycopene content were the highest in FL3 treatment(the regulated deficit irrigation),and the ratio of sugar to acid was in the optimal range.The water production function model of greenhouse tomato under Ditch on the high ridge with irrigation under film condition is:Ya/Ym=(ET2/ETm1)00068(ET2/ETm2)0.2087(ET3/ETM3)0.3773.(5)U sing AHP-DE A-grey-related comprehensive benefit evaluation method,comprehensive consideration of the quality and economic benefits of tomato and evaluation of each treatment.From the comprehensive evaluation index,the FL1 treatment(Ditch on the high ridge with irrigation under film + seedling adjustment)has the highest evaluation value.It indicates that the Ditch on the high ridge with irrigation under film + greenhouse tomato seedlings deficit treatment(the lower irrigation limit is 60%of Tian holding)is the optimal scheme,namely:irrigation 1 seedling period + flowering fruiting period irrigation 4 times +result period 5 times,each irrigation quota is 40mm,total irrigation capacity is 400mm.