Study On Evapotranspiration Of Soil Water And Consumption Of Nitrogen And Potassium Of Lycium Barbarum In Gravel-mulched Field

This study took lycium barbarum.in the gravel-mulched field as the research object,carried out field experiment in Xiangshan town,Zhongwei,Ningxia,China,established the evapotranspiration model suitable for lycium barbarum.in the gravel-mulched field in the central ningxia,and studied the nitrogen and potassium consumption process of lycium barbarum.in the gravel-mulched field.The main research results are as follows:(1)During the whole growth period of Chinese wolfberry,the water consumption of crops first increased and then decreased,and the maximum water consumption was 100.98mm in the peak fruit period,and the average daily water consumption was 4.81mm.Water consumption increases with the increase of irrigation quota.At the irrigation quota of 150m3/hm2,225m3/hm2 and 300m3/hm2,the water consumption of "ningqi no.9" and "ningqi no.5" is 321.8mm,381mm,453.2mm and 348.1mm,414.6mm and 496.3mm respectively.In terms of irrigation water utilization efficiency,W1 and W4 were the highest,respectively 0.76kg/m3 and 0.85kg/m3.W1 was 27.56%higher than W3,3.87%higher than W2,23.54%higher than W6,and 4.37%higher than W5.From the two aspects of yield and irrigation water use efficiency,W2 and W5 have reached a good level.In terms of wue,the wue of the same variety treated with irrigation water of 225m3/hm2 was the highest,which was 4.81kg/mm·hm2.The wue of the treatment treated with irrigation water of 225m3/hm2 was significantly different from that of other treatments,and reached the optimal wue.(2)There was a significant positive correlation between chlorophyll,growth index and photosynthesis of lycium barbarum.By integrating the growth indicators,photosynthetic characteristics,yield and quality of lycium barbarum.(3)Hargreaves-Samani model and Priestley-Taylor model to calculate the change trend of ET0 values and Penman-Monteith model to calculate the standard ET0 values change trend is consistent,in the Chinese wolfberry fertility period increased first,then decreased,June and July(first fruit enlargement period,provinces)evaporation,the largest in August began to fall(autumn fruiting)evaporation,the reproductive period of P-M model calculation amount of evapotranspiration is 793.5 mm,average daily evaporation is 4.31 mm.Before the correction,the correlation coefficients R2 of p-t model,H-S model and P-M model are 0.682 and 0.659 respectively,and the two models need to be modified.After the modification,R2 was changed to 0.919 and 0.826,respectively.The P-T model and p-m model had a high degree of fitting,and the accuracy of the revised Priestley-Taylor model was significantly improved after inspection.The amount of potential evapotranspiration and crop water consumption trends,from the germination period begins to increase gradually,bud evaporation and water consumption day average of 5.3 mm and 1.49 mm respectively,coated evaporation and water consumption day average 5.45 mm and 3.31 mm respectively,and the first fruit enlargement stage evaporation and water consumption day average of 6.22 mm and 4.81 mm respectively,reach maximum provinces,evaporation and water consumption day average of 6.79 mm and 5.49 mm respectively,autumn fruiting began to reduce,evaporation and water consumption day average of 4.67 mm and 3.12 mm respectively,During the deciduous period,the daily average values of evapotranspiration and water consumption are 2.28mm and 1.15mm respectively.The fruiting period is the key period for the gro,wth of medlar.(4)The consumption trend of nitrogen and potassium was generally the same.During the growing period of lycium barbarum.,the consumption first increased and then decreased,and the consumption reached the maximum in the fruit-bearing period.The nitrogen consumption of lycium barbarum.was significantly affected by the application of different amounts of nitrogen and potassium fertilizer.During the whole growth period,the nitrogen consumption of each treatment was 0.285g/kg.During each growth period,the nitrogen consumption during germination and flowering was small,and the nitrogen consumption during this growth period was 0.038g/kg,accounting for 13.3%of the total nitrogen consumption during the whole growth period.Nitrogen consumption in the first fruit growth stage was 0.070g/kg,accounting for 24.5%of the total nitrogen consumption in the whole growth stage.The consumption of nitrogen in this growth period was 0.098g/kg,accounting for 34.4%of the total nitrogen consumption in the whole growth period.The nitrogen consumption in autumn fruit stage was 0.064g/kg,accounting for 22.5%of the whole growth stage.The nitrogen consumption at the deciduous stage has become very small,with the nitrogen consumption at the deciduous stage being 0.015g/kg,accounting for 5.3%of the total nitrogen consumption at the growth stage.Potassium consumption during the whole growth period was 0.341g/kg.During each growth period,the consumption of potassium in the germination period and flowering period was small,which was 0.045g/kg in this growth period,accounting for 13.2%of the total consumption of potassium in the whole growth period.Potassium consumption in the first fruit expansion stage was 0.093g/kg,accounting for 27.3%of the total growth stage.The consumption of potassium in this growth period was 0.106g/kg,accounting for 31.1%of the total consumption of potassium in the whole growth period.Potassium consumption at autumn fruit stage was 0.079g/kg,accounting for 23.2%of total potassium consumption at growth stage.Potassium consumption at deciduous stage was 0.018g/kg,accounting for 5.2%of total potassium consumption at growth stage.(5)The chlorophyll,photosynthetic index,growth index,yield and quality of lycium barbarum.were significantly correlated with the amount of nitrogen and potash fertilizer.The content of lycium barbarum.polysaccharide,flavonoid and-carotene increased with the increase of the amount of nitrogen and potash fertilizer,and the content of betaine first increased and then decreased with the increase of the amount of nitrogen and potash fertilizer.The yield first increased and then decreased with the increase of the amount of nitrogen and potash fertilizer.The optimal fertilizer amount for the growth of lycium barbarum was 2400kg/hm2 of nitrogen fertilizer and 1800kg/hm2 of potash fertilizer.