6465

6030

كارشناسي ارشد

آبياري و زهكشي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده كشاورزي

1390

نوزده، 198ص.: مصور، جدول، نمودار

ص.ع. به فارسي و انگليسي

بهروز مصطفي زاده، فرهاد موسوي

محمدرضا عليزاده، محمدرضا يزداني

16/11/90

سعيد اسلاميان، محمدعلي حاج عباسي

1396/10/12

كتابنامه

كشاورزي

مهندسي كشاورزي

ID6030

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Effects of Different Methods of Puddling on Hydraulic Characteristics and Moisture Conditions of Dominant Paddy Soil in Guilan Province Maryam Marzi Nohadani Maryam marzi88@yahoo com Date of submission September 14 2011 Department of Water Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiB Mostafazadeh Fard Professor Supervisor behrouz@cc iut ac irS F Mousavi Professor Supervisor mousavi@cc iut ac irAbstractPuddling is one of the commonly used methods of land preparation and important step for ricecultivation Puddling affects the physical chemical and biological characteristics of soils and thesecharacteristics affect the growth of rice The common method of puddling is conventional tiller whichrequires long time of soil operations For rice cultivation during the shortage of water flood irrigationis changed to intermittent irrigation and the main problem with intermittent irrigation is developmentof soil cracks After irrigation when soil losses water the soils in Guilan province crack due to highclay content and cause high deep percolation In this study the effects of different puddling methodson hydraulic characteristics and moisture conditions of dominant paddy soil of Guilan province wereinvestigated in laboratory The treatments were 1 tillage equipment T1 conventional tiller T2 rotary puddler T3 cone puddler T4 tractor mounted rotivator 2 number of puddlings P1 one timepuddling P2 two times puddling P3 three times puddling P4 four times puddling 3 irrigation W1 permanent flooding W2 irrigation after the appearance of small cracks with width of 3 mm W3 irrigation after appearance of cracks with width of 1 cm W4 irrigation after appearance ofcracks with width of 3 cm The effects of the above treatments on soil physical characteristics andsoil crack properties were investigated during the soil wetting and drying phases The results showedthat the effects of irrigation on soil physical characteristics and soil crack characteristics weresignificant at 1 level for both soil wetting and drying phases During the drying phase as the soilmoisture condition changed from W1 to W4 soil compaction and water losses increased and soilmoisture decreased and the highest soil compaction was belonged to the W3 treatment In W4treatment soil compaction was lower than W3 treatment because soil shrinkage was lower for the W3treatment As number of puddlings increased soil moisture decreased During the drying phase soilbulk density increased from W1 to W3 and the soil water losses increased from P1 to P3 treatments The highest soil shrinkage and soil expansion was belonged to the T4 treatment The soil shrinkagedecreased from P1 to P3 The highest soil column diameter change was belonged to the P4 treatment The highest crack length was belonged to the conventional tiller and the tractor mounted rotivatortreatments and the lowest crack length was belonged to the P3 treatment The results of this studyshowed that the use of two new methods of T2 and T3 treatments rotary puddler and cone puddler caused higher soil misture conditions and delayed crack development These new methods reduce thenumber of puddlings and consequently lower labor costs Keywords Puddling Tillage equipment Paddy fields Intermittent irrigation Rotary puddler Conepuddler

بهروز مصطفي زاده، فرهاد موسوي

محمدرضا عليزاده، محمدرضا يزداني

سعيد اسلاميان، محمدعلي حاج عباسي