3559

3362

كارشناسي ارشد

آبياري و زهكشي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده كشاورزي

1385

يازده، [109]، [II]ص.: مصور، جدول، نمودار

ص. ع. به فارسي و انگليسي

جهانگير عابدي كوپايي

بيژن حاتمي، قدرت الله سعيدي

16/4/86

فرهاد موسوي، خورشيد رزمجو

1396/02/30

كتابنامه

كشاورزي

مهندسي كشاورزي

ID3362

به فارسي و انگليسي: قابل رويت در نسخه ديجيتال

AbstractWater is one of the most important resources in human societies Regarding many uses ofwater in agriculture and its low efficiency it is essential to find out practical approaches inimproving irrigation methods and optimizing use of water in order to reduce the adverseeffects of drought in agriculture One of these methods is deficit irrigation Water conditionaffects pest population directly and or indirectly by changing host suitability for insect pestsand altering host resistance In order to study the singular effect of water stress and togetherwith pest stress on corn yield an experiment was conducted in the research farm of IsfahanUniversity of Technology In two separate parts of the field sprayed and not sprayed afactorial design based on the completely randomized blocks was carried out with threetreatments of irrigation regimes including intensive stress 50 water requirement moderate stress 75 water requirement and no water stress 100 water requirement infour stages of corn growth first stage from seed germination until tasseling second stage from tasseling until milky third stage from milky until harvest and the whole period ofcorn growth in four replications for one year 2005 Pest populations were evaluated usingsweeping nets 6 strokes and with removing three corn plants from each plot Waterrequirement of corn was determined by Penman Mantheith equation and Cropwatsoftware Water stress was applied through constant irrigation period and variable irrigationregimes in all growth stages Results showed that applying water stress on corn reducedyield and other agronomic characters Reduction yield under moderate stress was 50 andunder intensive stress was 60 in sprayed part of the field This reduction in not sprayedpart was 65 under moderate stress and 68 under intensive stress The effect of moderatestress was not significantly different from no water stress treatments on agronomiccharacters In sprayed condition particularly applying moderate stress in first stages of cornuntil the first of third stage is suggested in drought condition Applying water stress on cornin all sampling weeks of pests had significant effect P 0 01 Water stress increased Thripstabaci and Tetranychus urticae populations The highest mean number of T tabaci and T urticae were observed in intensive stress during the whole period of corn growth Thelowest mean number of T tabaci and T urticae were observed in no water stress treatments On contrast applying water stress reduced Empoasca decipiens and Psammotettix alienuspopulations The highest mean number of E decipiens and P alienus was observed in nowater stress treatments

جهانگير عابدي كوپايي

بيژن حاتمي، قدرت الله سعيدي

فرهاد موسوي، خورشيد رزمجو