نتایج جستجو برای: photoperiod
تعداد نتایج: 5098 فیلتر نتایج به سال:
The effect of photoperiod and growing degree days (GDD) on dry matter and dry matter partitioning in Jerusalem artichoke was investigated during 2008-09 and 2009-10. Three Jerusalem artichoke genotypes (CN-52867, JA-89 and HEL-65) were planted in 15 day-intervals between with thirteen different dates (September 20 to March 20) atKhon Kaen University,Thailand. Jerusalem artichoke genotypes ...
The effect of photoperiod on wing length, body weight, and relationship between wing length and body weight was investigated in the mosquito species Anopheles quadrimaculatus. Individuals reared under a short photoperiod (8 h light: 16 h dark) had longer wings and larger weights than did those reared under a long photoperiod (16 h light: 8 h dark). Covariance analysis showed that photoperiod an...
This study aimed to evaluate the effect of photoperiod and different feeding times on growth performance and feed efficiency of juvenile beluga sturgeon (Huso huso) for 56 days. One hundred and twenty fish with an average weight of 51.5 ± 0.4 g (mean ± SD) subjected to four different treatments with three replications which distributed in 12 circular concrete tanks under the treatments includin...
effect of different photoperiodic regimes was evaluated on growth performance and survival rate of the beluga ( huso huso ) prelarvae and larvae. newly hatched prelarvae were stored in 5 round fiberglass 500‑l tank with different photoperiod (24l:00d, 18l:06d, 12l:12d, 06l:18 d, 00l:24d) till 50 days post hatch with three replicates. light intensity was 200 lux during the experiment. feeding wa...
BACKGROUND An understanding of the genetic determinism of photoperiod response of flowering is a prerequisite for the successful exchange of germplasm across different latitudes. In order to contribute to resolve the genetic basis of photoperiod sensitivity in maize, a set of 201 recombinant inbred lines (RIL), derived from a temperate and tropical inbred line cross were evaluated in 5 field tr...
Photoperiod and nutrient nitrogen (N) supply influence the growth, development, and productivity of crops. This study examined the physiological, biochemical, and morpho-anatomical traits of NA5 and NA9, two barley cultivars with contrasting photoperiod lengths, under the combined treatment of photoperiod regime and N supply. Under long photoperiod, high N supply decreased net photosynthesis; d...
Birds use photoperiod to control the time of breeding and moult. However, it is unclear whether responses are dependent on absolute photoperiod, the direction and rate of change in photoperiod, or if photoperiod entrains a circannual clock. If starlings (Sturnus vulgaris) are kept on a constant photoperiod of 12h light:12h darkness per day (12L:12D), then they can show repeated cycles of gonada...
Maize (Zea mays L.) is one of the major staple food crops of the world. However, high photoperiod sensitivity, especially for tropical germplasms, impedes attempts to improve maize agronomical traits by integration of tropical and temperate maize germplasms. Physiological and phenotypic responses of maize to photoperiod have widely been investigated based on multi-site field observations; howev...
The aim of this study was to assess the effect of different light intensities and photoperiods on growth, survival, and the yolk sac absorb of the Persian sturgeon, Acipenser persicus, larvae. Larvae were reared from hatching to yolk sac absorb (eight days) at four light intensities (0, 50, 150 and 300 lux) and three photoperiods (00L:24D, 12L:12D and 24L:00D) which consisted of seven treatment...
Photoperiod is one of the very important environmental factors that extremely affect growth performance, feeding and reproduction of various fish species. Thus In this research effects of different photoperiod regimes on Caspian Salmon during the premature stage (18 months old at the beginning of experiment) were investigated. One thousand liter tank with 20 premature fishs were allocated for e...
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