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1.
Discrimination between abiotic and biotic drought stress in tomatoes using hyperspectral imaging
Barbara Gerič Stare, Gregor Urek, Andrej Vončina, Matej Knapič, Jaka Razinger, Polona Strajnar, Saša Širca, Uroš Žibrat, Nik Susič

Povzetek: Crop plants are subjected to various biotic and abiotic stresses. Both root-knot nematodes (biotic stress) and water deficiency (abiotic stress) lead to similar drought symptoms in the plant canopy. In this work, hyperspectral imaging was used for early detection of nematode infestation and water deficiency (drought) stress in tomato plants. Hyperspectral data in the range from 400 to 2500 nm of plants subjected to different watering regimes and nematode infestation levels were analysed by partial least squares – discriminant analysis (PLS-DA) and partial least squares – support vector machine (PLS-SVM) classification. PLS-SVM classification achieved up to 100% accuracy differentiating between well-watered and water-deficient plants, and between 90 and 100% when identifying nematode-infested plants. Grouping the data according to the time of imaging increased the accuracy of classification. Shortwave infrared spectral regions associated with the OH and CH stretches were most relevant for the identification of nematode infested plants and severity of infestation. This study demonstrates the capability of hyperspectral imaging to identify and discriminate between biotic and abiotic plant stresses.
Ključne besede: nematode, Hyperspectral imaging, Drought stress, Root-knot nematode, Tomato
DiRROS - Objavljeno: 20.07.2018; Ogledov: 9; Prenosov: 2
.pdf Celotno besedilo (847,87 KB)

2.
Resin yield of Pinus nigra and Pinus sylvestris in the Slovenian Karst
Robert Brus, Kristjan Jarni, Miha Brecelj, Domen Gajšek, 2018

Povzetek: The aim of our research was to study the impact of various environmental factors on the resin production of pines in the Slovenian Karst. Five plots were established % three in Pinus nigra (Arnold) stands and two in Pinus sylvestris (L.) stands. On each plot, the 19-20 most vigorous dominant or codominant trees with a minimum diameter at breast height (DBH) of 20 cm were selected and their resin yield analysed in 2012. Resin yield in P. nigra was considerably higher than that in P. sylvestris. The average resin yield per tree during the study period of 102 days was 1.144 kg for P. nigra and 0.612 for P. sylvestris. There were substantial differences in resin yield among individual trees in the study period: 0.336-2.487 kg for P. nigra and 0.249-1.270 kg for P. sylvestris. The resin yield in P. nigra was considerably higher for the trees with larger DBH, while this was not the case in P. sylvestris. Tree species was the most important factor in resin yield. Increased precipitation resulted in higher resin yields on most plots, whereas better site productivity positively affected resin yield on all P. nigra plots but not on P. sylvestris plots.
Ključne besede: Black pine, Scots pine, resin production, resin yield, Slovenian Karst
DiRROS - Objavljeno: 05.07.2018; Ogledov: 94; Prenosov: 4
.pdf Celotno besedilo (1,78 MB)

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Trije pomembni gozdarji med Pohorjem in Kozjakom : dr. Maks Wraber
Ljudmila Medved, 2018

Ključne besede: gozdarstvo, biografije, gozdarji, Maks Wraber
DiRROS - Objavljeno: 20.06.2018; Ogledov: 169; Prenosov: 0
.pdf Celotno besedilo (323,99 KB)

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Belgijski gozdarji v Sloveniji izvedli trening odkazila
Kristina Sever, 2018

Ključne besede: gozdarstvo, mednarodno seodelovanje, gozdarji, izobraževanje
DiRROS - Objavljeno: 20.06.2018; Ogledov: 165; Prenosov: 0
.pdf Celotno besedilo (148,70 KB)

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Josip Koller : začetnik pogozdovanja krasa s črnim borom
Franc Perko, 2018

Ključne besede: erozija, zgodovina, Pinus nigra, umetna obnova, Kras
DiRROS - Objavljeno: 20.06.2018; Ogledov: 166; Prenosov: 0
.pdf Celotno besedilo (295,22 KB)

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