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Attempt at a comparison of the grapevine water requirements in the regions of Bydgoszcz and Wrocław

Rolbiecki S., Piszczek P., Chmura K.

Infrastruktura i Ekologia Terenów Wiejskich

2017

nr III/2

1157--1166

The aim of the present research was to compare the water requirements of grapevine in the regions of Bydgoszcz and Wrocław in the forty-year period between 1976 and 2015. In the research the authors used the mean monthly temperature values (°C) and monthly precipitation (mm) for the May-September period in the years 1976-2015. The meteorological data for the Bydgoszcz region was derived from standard meteorological measurements performed at the Experiment Station at Mochełek, and analysed at the Department of Land Reclamation and Agrometeorology of the UTP University of Science and Technology in Bydgoszcz. The meteorological data for the Wrocław region were provided by the Swojec experiment station of the Wrocław University of Environmental and Life Sciences. The grapevine water requirements were determined as optimal precipitation assumed by Kemmer and Schulz. It has been found that the grapevine water requirements in 1976-2015, expressed as the optimal annual precipitation according to Kemmer and Schulz, were higher in the Wrocław region than in the Bydgoszcz region and they amounted to 469.3 mm and 435.8 mm, respectively. The grapevine water requirements in both regions in the forty-year period under study showed a growing tendency. A larger increase in grapevine water requirements (27.5-28.0 mm per decade) occurred in the Wrocław region. The estimates show that during the forty-year period (1976-2015) the precipitation deficits in grapevine growing in the May-September period occurred in 11 years in the Bydgoszcz region and in 9 years in the Wrocław region.

Effect of the forecast climate change on the grapevine water requirements in the Bydgoszcz region

Rolbiecki S., Piszczek P.

Infrastruktura i Ekologia Terenów Wiejskich

2016

nr IV/4

1847--1856

The present research has aimed at estimating the water requirements of grapevine in 2016-2050 in the Bydgoszcz region based on the anticipated temperature changes. . The paper draws on the forecasting of mean monthly temperature for the Bydgoszcz region in 2011-2050 according to the climate change scenario for Poland SRES: A1B (Bąk, Łabędzki 2014). The water requirements of the grapevine have been determined based on the indispensable precipitation determined by Kemmer and Schulz. The water requirements were calculated for the period January through December and May through September for each year in the 35-year period (2016- 2050). The reference period was made up by a 35-year period immediately preceding it (1981-2015). In the 2016-2050 period in the Bydgoszcz region, in the light of the anticipated temperature change scenarios, one can expect increased grapevine water requirements. Determined with the Kemmer and Schulz method, the required optimal annual (January-December) precipitation will increase for the grapevine from 440 mm to 576 mm (by 136 mm, namely by 31 %). The optimal precipitation trend equations demonstrate that in the reference period (1981-2015), calculated with the Kemmer and Schulz, the optimal annual precipitation was increasing in grapevine in each pentad by 2.2-2.6 mm. In the forecast period (2016-2050) the water requirements will increase, however, in each pentad in a much greater range (8.0-8.9 mm). In the summer period (May-September) determined by Kemmer and Schulz, the total precipitation optimal for the grapevine, expressing the water requirements, in 2016-2050 will increase by 68 mm.