A calculative procedure for seasonal decomposition of time series for individualization of long-term fluctuation in the course of weather was presented on an example of 10 year results of mean, monthly air temperature and monthly sum of precipitations at meteorological point Mochełek near Bydgoszcz. That method can by used in analysis and presentation of hydrothermal conditions assisting agricultural research, provided that additive model of decomposition is accepted.
W trzyletnim doświadczeniu polowym badano wpływ 3 terminów siewu (25-28. VIII, 10-11. VIII i 25-27. VIII) na wzrost, przezimowanie oraz plony nasion cykorii korzeniowej uprawianej metodą bezwysadkową. W warunkach regionu środkowo-zachodniego Polski pozyskiwanie nasion cykorii tym sposobem okazało się możliwe, szczególnie w latach o dostatecznej liczbie opadów i dokonywaniu wysiewu najpóźniej do końca I dekady sierpnia.
The base of clustering analysis according to the nearest and furthest neighborhood methods to examine a coincidence of change course in chemical composition of cabbage plants affected by growing retardant doses was shown. A great similarity of phosphorus, magnesium, sugars and crude protein reaction and considerable dissimilarity in forming a content of crude fibre depending on experimental factor were stated. Application of cluster analysis can widen concluding on simultaneous reaction of different traits on a given factor beyond the range accessible due to the analysis of variance and regression.
The present paper concerns interactions between a set of objects, where the same components (fractions) can be isolated, and a standard object, which consists of arithmetical mean shares in these fractions. A method was proposed how to estimate the variability observed in the structure of a given object, as compared with the standard structure, as calculated with a coefficient of compatibility with the standard (CCS). According to the algorithm introduced, the coefficient value falls between ( 0.1). When the structure of a given object is identical with the one of the standard, the coefficient amounts to 0.5. If a growth in cumulative interest for respective fractions is more intensive as compared with the one of the standard, the coefficient amounts to less than 0.5, otherwise the coefficient is higher than 0.5. Applying the method presented, it was observed that the sowing material in the majority of pea cultivars, researched by the Centre for Cultivar Testing (COBORU) in 1995.
The residual effect of presowing soaking seeds in solutions of commercial preparations containing GA₃ and IAA on the growth, development and yield of amaranth of the cultivar Rawa (Amaranthus cruentus L.) was assessed over 2010-2012. It was found that plants grown from treated seeds showed much more abundant growth than the control plants. This activity will be continued also in later developmental phases, although it not always contributed to an increase in plant yield. It appeared that conditioning did not mobilize seeds for more numerous emergences as had been expected when taking up the study. During the growth season the field crop remained under a strong influence of unfavourable weather conditions. Difficulties in obtaining satisfactory density after emergences as well as rainy and windy weather during harvest pose a threat to success in growing amaranth in field.
The effect of some methods for the presowing improvement of seeds of amaranth of the cultivar Rawa (Amaranthus cruentus L.) on their sowing value was assessed in laboratory conditions. The results of seed soaking in solutions of commercial preparations were examined, where the active substance was synthetic growth regulators – auxin and giberelin. The experiments were conducted in 2010-2012 at the time preceding sowing seeds in the field (in April each year). It was indicated that under laboratory conditions germination energy and capacity of amaranth seeds of the cultivar Rawa depends to a much larger degree on germination temperature than on choosing the preparation in which sowing seeds are soaked, and germination capacity at 25ºC can be regarded as quite satisfactory in all the treatments. Soaking amaranth seeds in solutions of bioregulators turned up to be effective, although only in definite conditions.
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