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China University (2013)

Water Consumption And Responses To Regulated Deficit Irrigation Of Capsicum Annuum In Arid Desert Area

Huang H X

Titre : Water Consumption And Responses To Regulated Deficit Irrigation Of Capsicum Annuum In Arid Desert Area

Auteur : Huang H X

Grade : Doctoral Dissertation 2013

Université : China University

Résumé partiel
The effect of regulated deficit irrigation(RDI) on water consumption, water consumptionmodulus, water consumption intensity, plant growth, fruit production, physiological andbiochemical characteristics in the leaves were researched taking the fresh Capsicum (Longjiao2)and drying Capsicum(Meiguohong) as materials, designing four irrigation level including fullirrigation(CK), light RDI, medium RDI and severe RDI at planting-fruit setting stage, middlefruiting and late fruiting stage, respectively aiming at researching water consumption of Capsicumin arid desert area, discussing mechanism of drought resistence, water saving and yield increasingunder RDI and providing some theoretical basis for rational irrigation and high efficient plantingof Capsicum in arid area. The results are as follows:1. Water consumption was significantly positively correlated to irrigation amount ofCapsicum cultivated in open field (P<0.05, r=0.955). Compared with full irrigation,waterconsumption of Long jiao2(LJ) was reduced by7.49%,11.00%and14.21%,15.83%under mediumand severe RDI at planting-fruit setting and middle fruiting stage, water consumption ofMeiguohong(MGH) was reduced more with reduction of9.55%,11.80%and18.33%,20.08%.Total water consuption of MGH(470.08mm) was significantly lower than of LJ (514.14mm)under full irrigation. The water consumption modulus of the two varieties showed in the order ofmiddle fruiting stage(46%), planting-fruit setting stage(40%), late fruiting stage(14%), waterconsumption intensity of the two varieties also appeared in the same order and water consumptionintensity at each growth stage of MGH(4.81mm/d,4.18mm/d,2.79mm/d) was markedly lower thanof LJ (5.32mm/d,4.31mm/d,3.46mm/d). RDI significantly decreased water consumption modulusand intensity of the stage ued RDI and water consumption intensity of MGH was significantlylower than that of LJ under medium RDI at planting-fruit setting stage and RDI at middle and latefruiting stage. The crop coefficient(K c) at middle fruiting stage was the maximum for Capsicumcultivated in in arid desert region, and of LJ and MGH changed in the order of middle fruitingstage(1.16and1.05), planting-fruit setting stage(0.88and0.85), late fruiting stage(0.85and0.69)under full irrigation. RDI significantly reduced and difference in of the two varieties wassignificant under RDI at middle and late fruiting stage.2. Medium and severe RDI at planting-fruit setting and middle fruiting stage significantlydecreased plant height, plant diameter and leaf area index (LAI) of Capsicum, and plant growth ofLJ was more sensitive to water deficit than MGH. Under severe RDI at planting-fruit setting andmedium and severe RDI at middle fruiting stage, fruit number per plant, fruit weight, per plant yield and total yield of LJ reduced significantly and fruit number per plant, per plant yield and totalof MGH also decreased distinctly. Capsicum yield was maximaly decreased by water deficit atmiddle fruiting stage being water critical period.3. Under medium RDI at planting-fruit setting stage, water use efficiency of LJ and MGHbased on water consumption(13.29kg. m-3and7.44kg. m-3) and on irrigation amount (18.76kg.m-3and10.08kg. m-3) reached the maximum. Dry matter accumulation per plant returned to thecontrol level and ratio of dry matter distributed in stems, leaves and roots was proper, whichimproved the fruit production and significantly increased the content of Vc and total soluble solid.Taking above data into consideration, soil water content should be controlled between55%and65%of field water capacity at planting-fruit setting stage and75%to85%at middle and latefruiting stage, which can realize high yield, good quality and water saving cultivation of Capsicumin arid desert area.4. RDI reduced photosynthetic pigment content, net photosynthetic rate(Pn), transpirationrate(Tr), gas conductance(Gs) and PSⅡactivity in the leaves of Capsicum.

Mots clés : Capsicum annuum, regulated deficit irrigation, fruit production, water consumption, physiological and biochemical responses, rewater effect

Présentation (Globethesis)

Page publiée le 21 avril 2013, mise à jour le 10 janvier 2018