Effect of Four Methods of Determinations Potential Evapotranspiration on Maize and Wheat "Yield
1992
Agdaei,Mina | Rezaei , Moslehaldin | Allameh ,Mohammad Ali | Mohammadi,Alireza | Jahani, Khanom Gol
A field experiment was conducted for three growing seasons on application of four potential evapotranspiration determination method and using crop coefficient on yield of corn silage and ear corn (Garin-f-corn-cob) yield, wheat grain and straw yield. The experiment was arranged in a complete randomized block design with 5 replications. The treatments were determination of potential evapotranspiration by Blany-Cridel (B), corrected Penman (P), Radiation (R) , and class A. pan evaporation (AJ, methods. The soil texture was clay loam, (fine/ mixed, thermic, Haplocambids). For corn plant, during three years the number of irrigation for harvesting corn silage and grain were 11 to 12 and 13 to 15 applications, respectively. The effect of treatments on silage and ear yield were not significant. However, B method resulted in the highest water use efficiency by producing 78032 kg/ha corn silage with the least amount of "applied irrigation water of 8841 m3/ha. The water use efficiency for harvesting corn in B and A method were 1.70 and 1.72 kg/m3. The A method, also results in the least amount of application of irrigation "water of 9930 m3/ha and ear corn yield of 17125 kg/ha. For wheat plant the numbers of. irrigation application were 6 to 7. The effect of treatments were not significant on grain and straw yield. The water use efficiency for grain and straw yield resulted in the decreased in order of B and P methods. The 3 method resulted in the highest grain, and straw yield of 4770 and 8413 kg/ha, respectively with irrigation water application of 5098 mVha. ,
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