The aim of the study was to determine the effect of weather components (air temperature, precipitation) on the growth, yield and the length of the growing season of sweet corn cultivated in eastern Poland. The results come from a field experiment conducted in 2006-2011. Weather conditions in the successive years of the study significantly modified the yield of ears, weight and number of formatted ears, high of plants and the length of the growing season of sweet corn. Good yielding of sweet corn favoured years with moderate air temperatures in July and uniform distribution of precipitation during the growing season. The highest yield of ears was found in 2011, the lowest in the very difficult in terms of weather 2006. The shortest growing season was characterized corn grown in the years 2006 and 2010 with the high air temperatures in July and August, the longest in the years 2009 and 2011, in which the temperatures in the period June-August were the lowest of all the years of research. Irrespective of the year of study, cv 'Sheba F 1 ' was formatted eras with higher weight than cv 'Sweet Nugget F 1 '.
The experiment was carried out in 2007–2009. The investigated factors were: the kind of covers – without covering (control object), perforated foil with 100 holes per 1m2, polypropylene fibre weighing 17 g m−2 and broad beans cultivars – ‘Windsor Biały’, ‘Bizon’ and ‘Bachus’. Broad bean seeds were sown at the beginning of the second 10-days of April, at a spacing of 50 × 10 cm. Directly after, sowing field was covered by covers, which were left for 3 weeks. Broad bean was harvested in the stage of milky maturity of seeds. Before the harvest, the number of pods per plant was determined. During the harvest, the weight of pods and the yield of fresh seed were determined and productivity of seed from the weight of pods was calculated. Biometric parameters of pods and seeds i.e. length of pods, the number of seeds in the pod and length, width and thickness of seed was performed. It was found that the broad bean covering contributed to increase yield and improvement of the biometric parameters of pods and seeds compared to the control object without covering. The highest yield of pods and seeds produced cv ‘Bizon’. The best yield was obtained from plants covered by polypropylene fibre. The seeds of cultivated cultivars were characterized by similar parameters. Polypropylene fibre covering favoured formation of pods and seeds in the pods but did not cause changes in the seeds parameters.
Melon is a little popular vegetable to grow in Poland, due to high climatic requirements. Ensuring appropriate thermal conditions for plants growth is possible with relatively late planting seedlings. However, late planting does not guarantee high yield of good quality fruit. The factor enabling the earlier planting seedlings and improving the conditions of growth is the use of flat covers. covering (by 4 and 8 weeks from planting, until harvest, control without covering) on the yield and economic efficiency of melon cultivation in the field was investigated. Most preferably the yield level and profitability of melon cultivation were influenced by planting seedlings on the 15 May and covering by 4 weeks. However, earlier planting decreased the share of marketable fruits in the total number of fruits. The highest share in the costs structure of melon cultivation had the costs of human labour.
The effect of different transplanting dates (May 15, May 25, and June 4) and date of polypropylene fiber removal (4 and 8 weeks after transplanting, and control without covering) on the growth, development, and yield of melon (Cucumis melo L.) were investigated. The experiment was carried out during 2008-2010 in eastern Poland (51°53'23.64" N, 22°27'47.96" E). Plants planted on May 15 were longer by 22% and 56%, weighed more by 39% and 76%, and their leaf area index (LAI) was higher by 24% and 117% compared to plants planted on May 24 and June 4, respectively. However, delayed planting reduced the period of growth and development by 7 and 17 days, respectively. When the covering application period was extended from 4 to 8 weeks, stem length increased by an average of 23% and LAI by 38%, but harvest was delayed by 6 days. The respective yields of melon fruits planted on May 15, May 25, and June 4 amounted to 5.09, 4.73, and 3.99 kg m −2 . The covering of plants planted at each date contributed to an increase in yield and in the share of marketable fruit yield in the total yield. However, the length of the cover application period did not affect yield levels.
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