3596

3399

كارشناسي ارشد

مكانيك ماشينهاي كشاورزي

اصفهان: دانشگاه صنعتي اصفهان، دنشكده كشاورزي

1385

چهارده، 75، [II] ص: مصور، جدول، نمودار

ص.ع. به فارسي و انگليسي

امين الله معصومي، مرتضي صادقي

عباس همت

86/4/27

جليل رضوي، خورشيد رزمجو

مهندسي كشاورزي

ID3399

به فارسي و انگليسي: قابل رويت در نسخه ديجيتال

Abstract Alfalfa is the queen of forage plants The drying rate of this product in the fieldinfluences some properties including quantity quality and field curing time duringharvest One important factor in drying of this product is the resistance of boundarylayer to the air humidity When a mower conditioner is used for harvesting alfalfa drying happens with lower rate because of higher density of the swath In some zonesthe dew formed by wet air layer affect resistance of boundary layer Because ofradiation and wind blow leaves and stems on the upper part of the harvested alfalfaswath dry faster Alfalfa in the lower layers of the swath usually has higher moisturelevels which cause problem in quality and delays in baling Therefore to overcomethis problem it is necessary to design fabricate and evaluate a device for fluffing theswath without turning over or displacement Air movement through the alfalfawindrow as a result of fluffiness permits equal drying on different layers in thewindrow A fluffing mechanism was designed fabricated and evaluated having aframe three point hitch and power transmission unit A hydromotor provided thepower for running the system A pickup mechanism similar to what is used on bailerswas used Field test was performed and compared with customary field curing ofalfalfa Machine performance and it s effect on drying rate shatter loss and quality ofharvested crop was compared with performance of a wheel rake Cutting of alfalfawas performed using a self propelled windrower having crimper conditioning rolls Acomplete block design with four replications was used to conduct experiments Moisture content at cutting and baling stages was 70 and 20 on a wet basis respectively Moisture content was measured based on standard procedure in 3 hourintervals The well known exponential model was used to estimate and determinecoefficient Results indicated that alfalfa raked and processed by fluffing machine hada faster drying rate as compared to alfalfa undisturbed and cured in customarymethod Average value of drying constants for rake fluffer and undisturbed windrowcut with swather was 0 077 0 066 and 0 051 respectively Experiments fordetermining the amount of shatter loss and quality of the crop harvested wereperformed using a complete block design with three replications The results ofanalysis of variance showed no significant difference among different treatments forshatter loss percent protein and dry mater harvested

امين الله معصومي، مرتضي صادقي

عباس همت

جليل رضوي، خورشيد رزمجو