ارزيابي كاربرد دستگاه چاهك معكوس در مبارزه با سرماي بهاره (مطالعه موردي باغات بادام علويجه اصفهان)

An investigation on national SIS efficiency for spring frost protection (Case study,Almond orchards of Alavijeh, Isfahan)

In this research an almond orchard with 20 hectare area was selected according to frost damages data. The main factors for selecting this orchard were: at first its sufficient area and using modem agricultural systems such as sprinkle irrigation, Fogger and ... secondly high frost damages on crop yield according to available frost data. In the second stage we selected 7 plots in 50><50 m dimensions where distance between two plots was 50 m. We installed a meteorological screen, in which was a thermograph with minimum and maximum thermometers, in every plots for analyzing efficiency of Sink Inversed System (SIS) in frost protection. To determine efficiency and usefulness of SIS we selected another experimental plot that was sufficiency far from effectiveness domain of SIS as Control plot. After installing meteorological stations in orchard we signed some available almond trees in every plots. In each tree we selected two branches and every day total number of flower buds were counted, these data can be used for determining occurred frost damage percent in every plots. Finally we used Multi domain duncane test for comparing the effect of SIS in every plot with compare to the Control plot temperature data. The results showed that SIS can be used for increasing orchard air temperature and frost protection. The increasing in minimum air temperature can be 2.8 degree centigrade in the best situation and vary from 0.5 to 2.8 degree centigrade.