ﻣﺤﺎﺳﺒﻪ ﺗﺒﺨﯿﺮ- ﺗﻌﺮق ﺑﺎ ﺿﺮﯾﺐ ﮔﯿﺎﻫﯽ ﯾﮏ ﺟﺰﺋﯽ و دو ﺟﺰﺋﯽ ﺑﺮاي ﮔﯿﺎه ذرت در ﻃﻮل ﻓﺼﻞ رﺷﺪ

Calculation of evapotranspiration with a plant coefficient of one and two-component For the corn plant during the growing season

ﺗﻌﯿﯿﻦ ﻣﻘـﺪار ﺗﺒﺨﯿﺮ و ﺗﻌﺮق )ﻧﯿـﺎز آﺑﯽ ﮔﯿـﺎه( ـﯾﮏ ﻣﺆﻟﻔـﻪ ﻣﻬﻢ در ﺗﻌﯿﯿﻦ ﺑﯿﻼن آب و ﺑﻮدﺟـﻪﺑﻨـﺪي آﺑﯿـﺎري ﻣﯽـﺑﺎﺷــﺪ. ﻫـﺪف از اﯾﻦ ﻣﻄـﺎﻟﻌـﻪ ﻣﺤﺎﺳــﺒﻪ ﺗﺒﺨﯿﺮ و ﺗﻌﺮق ﮔﯿﺎه ذرت ﺑﺎ ﺿــﺮﯾﺐ ﮔﯿﺎﻫﯽ ﯾﮏ ﺟﺰﺋﯽ و دو ﺟﺰﺋﯽ و ﻣﻘﺎﯾﺴــﻪ آﻧﻬﺎﺳــﺖ. ﻣﻨﻄﻘﻪ ﻣﻮرد ﺑﺮرﺳــﯽ ﻣﺰرﻋﻪ آﻣﻮزﺷــﯽ و ﭘﮋوﻫﺸـﯽ ﭘﺮدﯾﺲ ﮐﺸـﺎورزي و ﻣﻨﺎﺑﻊ ﻃﺒﯿﻌﯽ داﻧﺸـﮕﺎه ﺗﻬﺮان اﺳـﺖ. در اﯾﻦ ﻣﻄﺎﻟﻌﻪ ﺿـﺮﯾﺐ ﮔﯿﺎﻫﯽ ﺑﻪ ﺻـﻮرت ﯾﮏ ﺟﺰﺋﯽ و دو ﺟﺰﺋﯽ ﺑﺮاي ﮔﯿﺎه ذرت در ﻃﻮل دوره رﺷـﺪ 100روزه ﻣﺤﺎﺳـﺒﻪ ﺷـﺪ. ﻧﺘﺎﯾﺞ ﻧﺸﺎن داد ﮐﻪ ﺑﯿﺸﺘﺮﯾﻦ ﺗﻔﺎوﺗﯽ ﮐﻪ در ﺿﺮﯾﺐ ﮔﯿﺎﻫﯽ ﯾﮏ ﺟﺰﺋﯽ و دو ﺟﺰﺋﯽ و در ﻧﻬﺎﯾﺖ در ﺗﺒﺨﯿﺮ- ﺗﻌﺮق ﻣﺤﺎﺳـﺒﻪ ﺷـﺪه ﺗﻮﺳـﻂ اﯾﻦ دو ﺿـﺮﯾﺐ ﺑﺮاي ﮔﯿﺎه ذرت وﺟﻮد دارد، در ﻣﺮﺣﻠﻪ اوﻟﯿﻪ رﺷـﺪ اﺳـﺖ. ﺑﺎ ﺗﻮﺟﻪ ﺑﻪ اﯾﻨﮑﻪ در ﺿـﺮﯾﺐ ﮔﯿﺎﻫﯽ دو ﺟﺰﺋﯽ ﻣﻘﺪار ﺗﺒﺨﯿﺮ در ﻣﺮاﺣﻞ اوﻟﯿﻪ رﺷﺪ ﮐﻪ ﺳﻄﺢ ﺧﺎك ﻟﺨﺖ اﺳﺖ، در ﻧﻈﺮ ﮔﺮﻓﺘﻪ ﻣﯽﺷﻮد، ﻣﻘﺪار ﺗﺒﺨﯿﺮ-ﺗﻌﺮق ﮐﻞ ﻣﺤﺎﺳﺒﻪ ﺷﺪه ﺑﺎ ﺿـﺮﯾﺐ ﮔﯿﺎﻫﯽ دو ﺟﺰﺋﯽ ) 602ﻣﯿﻠﯽﻣﺘﺮ( ﺑﯿﺸـﺘﺮ از ﻣﻘﺪار ﺗﺒﺨﯿﺮ- ﺗﻌﺮق ﮐﻞ ﻣﺤﺎﺳـﺒﻪ ﺷـﺪه ﺑﺎ ﺿـﺮﯾﺐ ﮔﯿﺎﻫﯽ ﯾﮏ ﺟﺰﺋﯽ )557/5 ﻣﯿﻠﯽﻣﺘﺮ( اﺳﺖ.

Determining the amount of evapotranspiration (plant water requirement) is an important component in determining water balance and irrigation budgeting. The aim of this study was to calculate the evapotranspiration of maize plants with one-component and two-component plant coefficients and compare them. The study area is the educational and research farm of the Agriculture and Natural Resources Campus of the University of Tehran. In this study, plant coefficient was calculated as one-component and two-component for maize during the 100-day growing period. This study was conducted in the educational and research farm of the Campus of Agriculture and Natural Resources, University of Tehran. The results showed that the greatest difference between the one-component and two-component plant coefficients and finally in the evapotranspiration calculated by these two coefficients for the corn plant is in the early stages of growth. Considering that in the two-component plant coefficient, the amount of evaporation in the early stages of growth, when the soil surface is bare, is considered, the total evapotranspiration rate calculated with the two-component plant coefficient (602) is greater than the total evapotranspiration rate Calculated with a one-component plant coefficient (557.5).