In the climatic conditions of Poland the temporary lack of rainfall
during the vegetation season, influenced on the water deficits in the top
soil level. This situation can effect on the height and quality of yields in
particular years. There is estimated that in the – so called – Large Valleys
Region the water deficiency ranged 200-300 mm. Production of cucurbit’s
vegetables in open field is strictly connected with thermal-rainfall conditions
during the vegetation season. The optimal soil moisture is the very
important factor for high and good quality yield. So, the production of
the cucurbit plants should be connected with the irrigation installations.
The aim of the study was to determine the influence of drip irrigation in
cultivation of summer squash ‘Danka’ under light soil conditions. The trials
were conducted in the years 2004 – 2006 at the experimental field
in Kruszyn Krajeński near Bydgoszcz – on a soil of rye weak complex.
The plot area for harvest was 9,1 m2. The irrigation rates were done on
the base of soil water potential according to tensiometer indications. The
irrigation was started when the soil water tension was – 0,04 MPa. The
fruits of the summer squash were harvested in the technological maturity
in the second decade of September in each year of the study. The
single weight and number of the fruits as well as marketable yield from
the unit area were estimated. In the pulp the dry matter, vitamin C, sugars
and carotenoids content were determineted. It was found that drip irrigation
significantly increased the marketable yield of fruits. The higher
yield increases were detected in the years with lower rainfalls. The significant influence of drip irrigation on the content of vitamin C and
sugars was stated. The dry matter and carotenoids content were higher
in the fruits from the irrigated plots, but the difference was insignificant.
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