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Irrigation effects of red beet [Beta vulgaris L.] under sandy soils conditions as affected by rainfall during the critical periods

100%

Rolbiecki S., Rolbiecki R.

Przegląd Naukowy Wydziału Melioracji i Inżynierii Środowiska

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1998

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nr 15

2

Ontogenetic features of protein metabolism in laying hens during the rearing and egg production period

84%

Kyryliv B.

Acta Scientiarum Polonorum. Zootechnica

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2018

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tom 17

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nr 3

3

Competition and critical periods in spring sugar beet cultivation

84%

Martinez J. M., de Juan Valero J.-A., Padilla A. D., Picornell Buendia M.-R.

Journal of Plant Protection Research

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2015

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tom 55

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nr 4

High yields with low costs require that sugar beets be kept free of weeds, during critical periods, using labor or chemical treatments. Since the critical periods for this crop in Castilla – La Mancha (Spain) are unknown, the first goal of this study was to determine the effect of early and late competition on yield. The second goal was to determine the critical periods, while taking into consideration the semiarid climatic conditions of this region. Two irrigation farms located in the province of Albacete are dedicated to sugar beet cultivation. These two farms were chosen to carry out the tests March (140,000–150,000 seeds ∙ ha–1) and harvested in October. Two simultaneous and complementary experiments were carried out in each year and farm. Two scenarios were considered with eight different treatments each. In the first one (With Weeds Until – WWU), plots were infested by weeds up to a certain date. In the second one (Free of Weeds Until – FWU), plots were kept free of weeds up to a certain date. For each test, a randomised experimental blocked field was designed and there were four repetitions, each of them containing eight elemental plots (12 m2). Each plot was weeded by hand or weeds were left to grow till a definite date.The results indicated that a 1% loss of yield was reached in the early competition after 14 days, while a loss of 5% was reached after a period of 41 days after it was infested. The results also indicated that in late competition, if a crop is kept clean for 124 days and it is infested afterwards, a 1% loss is reached. However, the loss increases to 5% if the plot is kept clean for 111 days. For a 1% loss the critical period is 110 days and 70 days for a 5% loss.

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Periodization in the development of flowering plant reproductive structures: critical periods

84%

Batygina T. B., Vasilyeva V. E.

Acta Biologica Cracoviensia. Series Botanica

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2003

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tom 45

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nr 1

The theory of critical periods in plant ontogenesis has been elaborated from studies of integral morphogenetic processes on different levels. The periodization of the development of various reproductive structures (anther, microspore, pollen grain, ovule, megagametophyte, egg cell, zygote and embryo) has been worked out from data on morphogenesis using systemic and complex morphophysiological approaches. Critical phases, stages and periods have been revealed, for example the stage of autonomy in different flowering plants, by means of culture in vitro. The concepts of "critical period" and "critical mass" in relation to embryonal structure periodization are discussed here. Also addressed are the question of allometry and the significance of morphogenetic fields and rhythms of cell division for revealing critical periods and the management of ontogenesis. Examination of the genesis and structure of anthers and ovules in various flowering plant species has permitted us to discover general regularities in their development and the occurrence of three common critical periods: premeiotic, meiotic and postmeiotic. Embryo development in angiosperms is characterized by two common phases (proembryonal/blastomerization and embryonal/organogenesis) and five critical periods (zygote and proembryo, globular, heart-shaped, torpedo-shaped, and mature embryo). The combination of common and specific critical periods and stages determines the taxon-specific morphogenesis of reproductive structures and contributes to the plasticity and tolerance of the reproductive systems of different species of flowering plants, and of ontogenesis as a whole.

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Wykorzystanie dwuwymiarowego modelu przeplywu do oceny statecznosci drzewostanow legowych na przykladzie doliny Wisly w okolicy Pulaw

67%

Kaluza T.

Acta Scientiarum Polonorum. Architectura

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2007

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tom 06

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nr 2

37-48

W pracy przedstawiono zastosowanie modelu numerycznego do analizy warunków, w jakich może dojść do utraty stateczności drzewostanów. Wykorzystując program ArcView i dwuwymiarowy model przepływu Rismo, stworzono aplikację pozwalającą obliczyć wartości krytycznych momentów stateczności drzew. Do weryfikacji numerycznego modelu stateczności drzewostanów wybrano lasy łęgowe doliny rzeki Wisły w okolicy Puław. Lasy te zostały zniszczone w dniu 4 sierpnia 2001 roku w czasie gwałtownej burzy. Wystąpienie w okolicy Puław wichury zbiegło się z przejściem fali powodziowej na Wiśle. Na wybranym odcinku rzeki Wisły wykonano szczegółowe pomiary parametrów drzew i podłoża. Korzystając z danych hydrologicznych i meteorologicznych, możliwe było wykonanie symulacji warunków, w jakich doszło do wywrócenia drzew.

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Maternal behaviour of mares and the condition of foals after parturition

67%

Zurek U., Danek J.

Bulletin of the Veterinary Institute in Puławy

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2011

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tom 55

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nr 3

Eighteen purebred Arabian mares and six Anglo-Arabian mares were observed during first 4 h after foaling in one of the leading Polish stud farms in two foaling seasons. The aim of the research was to analyse the behaviour of mares and the condition of foals after parturition. Specific behavioural responses like licking, nuzzling, and touching a foal were identified as interactive activities supporting the process of creating the bond between the mare and the foal. The maternal behaviours started immediately after parturition and reached the biggest frequency in the first hour after foaling. The time spent by the mares on standing, resting, and eating has also been measured. The results of observations were compared in reference to mares' breeds and statuses. Aggressive maternal behaviour, both normal and abnormal (perceived as aberration) was noticed. Foal's condition after parturition was assessed on the basis of the first standing up, colostrum nursing, and meconium passing. On average, the foals made attempts to stand up in the 21st min after birth, and the first self-reliant getting up occurred in the 85th min. The share of time spent by the foals in the upright position increased with even hour. Furthermore, the time of the first colostrum nursing was associated with the first standing up. The duration of gestation influenced foals' colostrum nursing and meconium passing.

Ograniczanie wyników

1 Acta Biologica Cracoviensia. Series Botanica

1 Acta Scientiarum Polonorum. Architectura

1 Acta Scientiarum Polonorum. Zootechnica

1 Bulletin of the Veterinary Institute in Puławy

1 Journal of Plant Protection Research

1 Przegląd Naukowy Wydziału Melioracji i Inżynierii Środowiska

1 Batygina T. B.

1 Danek J.

1 Kaluza T.

1 Kyryliv B.

1 Martinez J. M.

1 Padilla A. D.

1 Picornell Buendia M.-R.

1 Rolbiecki R.

1 Rolbiecki S.

1 Vasilyeva V. E.

1 Zurek U.

1 de Juan Valero J.-A.

1 2018

1 2015

1 2011

1 2007