Akademska digitalna zbirka SLovenije - logo
Fakulteta za strojništvo, Ljubljana (FSLJ)
  • Fruit thinning with selective spraying [Elektronski vir]
    Osterman, Aljaž ...
    Experimental fruit thinning was performed in an orchard on apple trees of Elstar and Brina variety. Fruit thinning, which gives bigger fruit and reduces the effect of alternate bearing, was done by ... spraying during development of fruit (phenological growth stage 71 using the BBCH-scale). A precision GPS module was added to an air-blast sprayer previously upgraded with electromagnetic valves, relays, National Instruments Compact Data Acquisition (NI cDAQ) system and a computer. Selective spraying was based on a number of flowers on each individual apple tree. Flowers were manually counted during full flowering when trees were also recorded with a camera. For each picture a corresponding GPS position was logged. Precise GPS positioning was based on a u-blox LEA- 6T module and Real-Time Kinematics for which a base station signal was obtained via GSM modem from Slovenian GPS network SIGNAL. GPS signals were processed by RTKLib program package. In this way real-time positioning in a cm-range was possible. Precise locations of apple trees were determined from recorded pictures. Location of a tree was determined so that a trunk was in the center of the picture. Locations and corresponding number of flowers were stored on the computer mounted on the sprayer. During thinning GPS positioning was done in the same way (as during the recording of trees). Based on a current sprayer location the number of flowers of the nearest tree was compared against a threshold value. When the number of flowers was higher than the threshold value the electromagnetic valves, which were mounted before the spraying nozzles, opened and the tree was sprayed. In this way only over-flowering trees were thinned. For manipulation of electromagnetic valves based on a number of flowers a LabView program was written. Selective spraying of alternating apple trees resulted in reduced spray consumption, more evenly loaded trees and higher quality of apples. It is also expected that with such spraying alternate bearing will be reduced in the future.
    Vir: Aktualni zadaci mehanizacije poljoprivrede [Elektronski vir] : Zbornik radova 42. Međunarodnog simpozija iz područja mehanizacije poljoprivrede, Opatija, 25. - 28. veljače 2014 = Actual tasks on agricultural engineering : proceedings of the 42nd International Symposium on Agricultural Engineering, Opatija, Croatia, 25-28 February 2014 (F. 189-195)
    Vrsta gradiva - prispevek na konferenci
    Leto - 2014
    Jezik - angleški
    COBISS.SI-ID - 13362459

Vnos na polico