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Wyszukujesz frazę "occurrence frequency" wg kryterium: Temat


Wyświetlanie 1-3 z 3
Tytuł:
Częstość występowania niekorzystnych warunków wilgotnościowych w okresie wegetacji buraków cukrowych
Povtorimost neblagoprijatnykh uslovijj vlazhnosti v period rosta sakharnojj svjokly
The occurence frequency of unfavourable humidity conditions in the growth period of sugar beets
Autorzy:
Tomaszewska, T.
Powiązania:
https://bibliotekanauki.pl/articles/803608.pdf
Data publikacji:
1990
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
wystepowanie
czestosc
niekorzystne warunki
wilgotnosc
wegetacja
burak cukrowy
occurrence
frequency
less favoured area
moisture
vegetation
sugar-beet
Opis:
Для характеристики условий влажности принят условный гидротермический показатель (К) используемый в районировании сахарной свеклы на территории социалистических стран Европы. Классификация на районы влажности принимается по величине показателя К на уровне вероятности. Для умеренной зоны выделяются следующие районы увлажнения: очень засушливый район (К = 0,61-0,80), засушливый (К = 0,81-1,00), слабозасушливый (К = 1,01-1,20), умеренного увлажнения (К = 1,21-1,40), оптимального увлажнения (К = 1,41-1,60) и влажный (1,61 -1,80). На основе тридцатилетних данных (1931-1960) составлена карта распределения обсуждаемого показателя на уровне 80% вероятности. Преобладают три главных района влажности: умеренного увлажнения, оптимального увлажнения и влажный. На небольшой территории в окрестности Гнезна и Тшемешна - район слабо засушливый. По тридцатипятилетним данным (1951/52-1985/86) сравнива псовтормость лет с неблагоприятными условиями влажности для сахарной свеклы в выделенных на карте районах. В районе умеренного увлажнения годы с засушливыми условиями выступают в около 3-6%, с условиями слабо засушливыми в около 9-17%, тогда как в районе оптимального увлажнения годы с засушливыми условиями вообще не выступают, а с условиями слабо засушливыми выступают в около 6-9% лет. Во влажном же районе годы с засушливыми условиями не выступают, а со слабо засушливыми выступают не чаще 3% лет. Можно принять, что в годы, в которые показатель принимает значение ниже 1,00 (засушливые условия) орошение должно давать очень хорошие результаты. Также в годы с показателем ниже 1,20 (слабо засушливые условия), особенно на легких почвах, орошение весьма желательно.
The so called hydrothermal index K has been used to distinguish sugar beet cultivation regions under different humidity conditions in socialist states of Eastern Europe. The division has been made on the basis of values of K at the level of 80 per cent probability. For the temperate zone the following regions have been distinguished: extremely dry (K: 0.61-0.80), very dry (0.81-1.00), dry (1.01-1.20), moderately wet (1.21-1.40), of optimal humidity (1.41-1.60) and wet region (1.61-1.80). On the basis of data from the period 1931-1960 the map of K values at the 80% level has been plotted. Three humidity regions are predominant: moderately wet, of optimal humidity and wet. The dry region is located near Gniezno and Trzemeszno but occupies only a limited area. On the basis of 35-year data of the period 1951/1952-1985/1986 a comparison has been made of occurrence of years with unfavourable humidity conditions for sugar beet cultivation in distinguished regions. In the moderately wet region very dry years occur in 3-6% of cases, whereas in the dry region the respective figure is 9-17%. In the optimal humidity region, dry years do not occur at all and very dry years occur in 6-9% of cases. In the wet region very dry years do not occur and dry years occur in less than 3% of cases. It can be assumed that in the years, in which the evaluated index K exceeds the threshold of 1.00 (very dry conditions) irrigation should give good results. Also in the years when the index is lower than 1.20 (dry conditions) irrigation is desirable, especially of sandy soils.
Źródło:
Zeszyty Problemowe Postępów Nauk Rolniczych; 1990, 387
0084-5477
Pojawia się w:
Zeszyty Problemowe Postępów Nauk Rolniczych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Somaclonal variation in winter wheat [Triticum aestivum L.]: frequency, occurrence and inheritance
Autorzy:
Cheng, X Y
Gao, M.W.
Liang, Z.Q.
Liu, G.Z.
Powiązania:
https://bibliotekanauki.pl/articles/2044461.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
inheritance
tissue culture
Triticum aestivum
occurrence
in vitro
winter wheat
gene mutation
plant breeding
callus induction
frequency
somaclonal variation
wheat
embryo
Opis:
Plants were regenerated from immature embryo cultures of 35 winter wheat genotypes. General responses of regenerated plants were investigated and a total of 7142 R₂ spike lines from 1593 R₁ plants were assessed in the field for somaclonal variants in 1985/86, 1986/87 and 1987/88. Selected variants were studied for their possible genetic inheritance. From regenerated plantlets, 81% survived and 63% produced fertile plants. Forms with reduced plant height, length of spike and other morphological abnormalities were found in this progeny. Populations of R₁ plants were highly variable due mainly to the physiological disturbances resulting from the in vitro process. Overall somaclonal variation frequencies were 14.2% per plant basis and 5.3% per R₂ spike basis. The variants were similar in the three different R₂ generations with predominant variants being negative in plant height, maturity, awns, spike type and plant type. Both uniform R₂ variant families and spike lines were found in addition to the segregating variants which constituted the majority. On average, in a variant family or line, 18% and 14% of their component lines and plants were variants, respectively. Inheritability was demonstrated for the uniform variant families and spike lines as well as segregated variants. Of those 134 selections, about 70% were classified as inheritable. Both recessive and dominant gene mutations at one, two or three loci were evident in some variants as suggested by the segregating data.
Źródło:
Journal of Applied Genetics; 1998, 39, 1; 59-72
1234-1983
Pojawia się w:
Journal of Applied Genetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of tillage system and forecrop type on frequency of Fusarium culmorum and F. avenaceum occurrence on culm base of some winter wheat (Triticum aestivum L.) cultivars
Wpływ sposobu uprawy roli i rodzaju przedplonu na częstotliwość występowania Fusarium culmorum i F. avenaceum u podstaw źdźbła wybranych odmian pszenicy ozimej
Autorzy:
Weber, R.
Kita, W.
Powiązania:
https://bibliotekanauki.pl/articles/28466.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
tillage system
forecrop type
frequency
Fusarium culmorum
Fusarium avenaceum
occurrence
culm
wheat
winter wheat
Triticum aestivum
plant cultivar
culm base disease
fungal disease
plant disease
Opis:
In the years 2001 – 2003, there were analyzed relations between the number of Fusarium culmorum and F. avenaceum, fungi found on culm base parts of stalks of seven winter wheat cultivars, and preceding crop type as well as the cultivation system. The research was carried out in Poland, on light soil plots of a Lower Silesia-based experimental station subordinate to the Institute of Soil Science and Plant Cultivation (IUNG). The loglinear and correspondence analyses proved varying immunity of particular wheat cultivars to F. culmorum and F. avenaceum fungi. There were also observed significant differences in Fusarium diseases of wheat as dependent on precipitation and temperature in the growing season. The Kobra cultivar was highly resistant to F. avenaceum. The lowest amounts of F. culmorum fungi were detected in the culm base parts of the Izolda cultivar. The cultivation of corn, as a preceding crop for oats and for spring wheat, did significantly differentiate varieties of fungi in the cultivation systems examined. In the plough cultivation system, wheat was mainly infected by Fusarium culmorum, whereas in direct sowing, particular cultivars of wheat were mostly infected by F. avenaceum.
Źródło:
Acta Agrobotanica; 2010, 63, 1
0065-0951
2300-357X
Pojawia się w:
Acta Agrobotanica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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