The aim of the study was to evaluate the effect of crop load on leaf area evolution and on the amount of intercepted light. The research was carried out in Southern Italy (N 40° 20’, E 16° 48’) in an irrigated vineyard of ‘Montepulciano’ grafted on 1103 P. Vines, with four canes and about 10-12 buds per cane, were spaced 2.50 x 2.50 m and trained to a ‘Tendone’ system. The vineyard was managed according to the ordinary techniques of the area. Three levels of crop load were imposed at fruit set: treatment 1 (UT) or unthinned control, with about 70 clusters per vine; treatment 2 (T50), in which 50% of the clusters were thinned and 1 cluster per shoot was retained; treatment 3 (T75) - in which 75% of the clusters were thinned and 1 cluster every two shoots was retained. Leaf area evolution was evaluated by collecting shoots from mature vines. Six or eight shoots, randomly chosen from 5 vines, were sampled monthly from 15 days after bud break to the end of September. The following measurements were performed on each shoot: number of stem leaves and lateral leaves, leaf area of stem and lateral leaves, stem and lateral length. Leaf area was measured using a photometric area-integrating meter (LI-COR Model LI-3100, manufactured by Lambda Instruments Corporation). Transmitted photosynthetic photon flux density (PPFDt) at the base of the canopy (0.2 - 0.3 m above the ground surface) was determined using a linear PAR Ceptometer (Accupar - Decagon Device, Inc., Pullman, Wash.). Measurements were taken on three different vines per treatment over the single vine spacing area on a grid of 0.2 x 0.1 m. Incident PPFD (PPFDi) was measured outside of the trees every five minutes. Measurements were taken around noon of sunny days from May to September. Intercepted PPFD (PPFDin) was calculated for each point of the grid as the difference between PPFDi and PPFDt; diffused and reflected components of PPFD were not considered. The preliminary results have shown that vines trained to 'Tendone' system have a high capacity to produce fruits and vegetative organs. Intercepted light reaches a maximum value upon maximum LAI. Significant differences in shoot leaf area and LAI between the three crop load levels were observed.

Crop load effects on leaf area evolution and light interception in 'Montepulciano' grapevines (Vitis vinifera L.) trained to 'Tendone' system

NUZZO, Vitale
2004-01-01

Abstract

The aim of the study was to evaluate the effect of crop load on leaf area evolution and on the amount of intercepted light. The research was carried out in Southern Italy (N 40° 20’, E 16° 48’) in an irrigated vineyard of ‘Montepulciano’ grafted on 1103 P. Vines, with four canes and about 10-12 buds per cane, were spaced 2.50 x 2.50 m and trained to a ‘Tendone’ system. The vineyard was managed according to the ordinary techniques of the area. Three levels of crop load were imposed at fruit set: treatment 1 (UT) or unthinned control, with about 70 clusters per vine; treatment 2 (T50), in which 50% of the clusters were thinned and 1 cluster per shoot was retained; treatment 3 (T75) - in which 75% of the clusters were thinned and 1 cluster every two shoots was retained. Leaf area evolution was evaluated by collecting shoots from mature vines. Six or eight shoots, randomly chosen from 5 vines, were sampled monthly from 15 days after bud break to the end of September. The following measurements were performed on each shoot: number of stem leaves and lateral leaves, leaf area of stem and lateral leaves, stem and lateral length. Leaf area was measured using a photometric area-integrating meter (LI-COR Model LI-3100, manufactured by Lambda Instruments Corporation). Transmitted photosynthetic photon flux density (PPFDt) at the base of the canopy (0.2 - 0.3 m above the ground surface) was determined using a linear PAR Ceptometer (Accupar - Decagon Device, Inc., Pullman, Wash.). Measurements were taken on three different vines per treatment over the single vine spacing area on a grid of 0.2 x 0.1 m. Incident PPFD (PPFDi) was measured outside of the trees every five minutes. Measurements were taken around noon of sunny days from May to September. Intercepted PPFD (PPFDin) was calculated for each point of the grid as the difference between PPFDi and PPFDt; diffused and reflected components of PPFD were not considered. The preliminary results have shown that vines trained to 'Tendone' system have a high capacity to produce fruits and vegetative organs. Intercepted light reaches a maximum value upon maximum LAI. Significant differences in shoot leaf area and LAI between the three crop load levels were observed.
2004
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11563/4286
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