5682

5303

كارشناسي ارشد

خاكشناسي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده كشاورزي

1389

يازده،59ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

مجيد افيوني، محمدعلي حاج عباسي

جهانگير عابدي كوپايي

17/12/89

محمدرضا مصدقي، سعيد اسلاميان

1397/08/02

كتابنامه

مهندسي كشاورزي

ID5303

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Effect of Geohumus and Hydrogel on Soil Hydraulic Properties and Growth Indices of a Nursery Plant Cucumis sativa L Nasim Sadat Mortazavi nasimmory@yahoo comEmail address Date of submission 29 12 2010 Department of Soil Science Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Supervisors Majid Afyuni Prof afyuni@cc iut ac ir Mohammad Ali Hajabbasi Prof hajabbas@cc iut ac ir Abstract Application of superabsorbent polymers is a suitable method to enhance water use efficiency in agricultural soil The polymers improve soil hydraulic properties such as water holding capacity plant available water and hydraulic conductivity of soil Superabsorbent polymers absorb high amount of water and release it gradually as soil dries out In this research the effect of two superabsorbents Geohumus and Hydrogel on soil hydraulic properties and plant growth was evaluated This research was done in two stages The first stage was conducted as completely randomized design in which treatments were different levels of superabsorbents 0 5 10 and 20g Geohumus kg soil and 0 4 6 and 8 g Hydrogel kg soil The aim of this stage was to determine effect of superabsorbents on soil physical and hydraulic properties The second stage was a greenhouse trial conducted as completely randomized factorial design in which the treatments were 4 levels of superabsorbents the same with first stage and three irrigation regimes consisting 50 70 and 100 percent of field capacity The objectives of this stage were evaluation of superabsorbents on growth indices and yield of cucumber Cucumis sativa var Danito under reduced irrigation regimes The results showed that using of Geohumus leads to significant increase in amount of water in FC and PWP and uptake of N K and Fe by plant but there was a significant decrease in soil hydraulic conductivity and available water content of the soil But the changes on bulk density particle density MWD and Zn and P uptake by plant were not significant A significant increase in height fresh weight and dry weight of cucumber plants were observed in the 5 g Geohumus per kg soil but there was a significant decrease in these growth indices by increasing the Geohumus levels Using of Superab A200 leads to significant increase in amount of FC and PWP water MWD water availability fresh and dry weight of plant but it leads to significant decrease in soil hydraulic conductivity No significant difference was observed in bulk density particle density and fruit weight Also No special trends were found in nutrient uptakes by plant in Hydrogel treatments Increasing of water regimes to 100 of FC leads to significant increase in fruit weight and all growth indices of plant Key words Superabsorbent polymers Geohumus Hydrogel

مجيد افيوني، محمدعلي حاج عباسي

جهانگير عابدي كوپايي

محمدرضا مصدقي، سعيد اسلاميان