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Adaptations of Lamium album L. flowers to pollination by Apoidea

100%

Sulborska A., Dmitruk M., Konarska A., Weryszko-Chmielewska E.

Acta Scientiarum Polonorum. Hortorum Cultus

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2014

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tom 13

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nr 6

The presence of ruderal and mid-field vegetation promotes conservation of biodiversity and provides an additional source of food for insect pollinators. The white deadnettle is a common synanthropic plant visited frequently by various groups of insects, as it is a source of pollen and nectar. In 2012–2013, in the city of Lublin (Poland), signalling and food attractants in L. album flowers were analysed using light and scanning electron microscopy. The pipetting method was used for determination of nectar abundance in the flowers, and the content of sugars in the nectar was assessed with the use of an Abbe refractometer. It was found that the white dead-nettle flowers emitted a fragrance and were equipped with nectar guides, and the corolla and stamens had glandular trichomes and papillae secreting essential oils. On the stamens, there are also non-glandular trichomes, which play a role of pollen presenters. The nectary in the L. album flower has a shape of an irregular disc partly surrounding the base of the ovary. The content of sugars in the nectar was 43%. Sugar and honey yields per ha were calculated, and the values obtained were 153 kg and 191 kg, respectively.

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Flowering dynamics, nectar secretion and insect visitation of Phacelia campanularia A. Gray

100%

Wroblewska A.

Acta Agrobotanica

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2010

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tom 63

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nr 1

In the years 2004-2006, flowering dynamics and nectar secretion of Phacelia campanularia A. Gray flowers as well as the insect visitation rate were studied in the climatic conditions of Lublin, Poland. The flowering of phacelia started in the middle of June and lasted for 1.5 up to 2 months. Full bloom occurred between the third and fifth week of the flowering period of this taxon. For the study period, the average weight of nectar produced by 10 flowers was 75.64 mg, weight of sugars 11.31 mg, while their concentration in the nectar was 20.2%. Among the entomofauna foraging on the flowers of phacelia, honey bees were predominant, with their proportion among the pollinators accounting for 84.8%.

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Effect of different K-supply on sugar beet production and soil fertility in a long-term fertilizer experiment

100%

Von B. L. C., Orlovius K.

Biuletyn Instytutu Hodowli i Aklimatyzacji Roślin

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2002

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tom 222

In a long-term field experiment with a duration of 19 years the impact of different rates of potassium (0–100–200–300 kg K2O/ha/year) with and without farmyard manure (FYM) (30 t/ha every 3 years before sugar beet) on yields, crop quality, K-content in the soil and the economic effects in a sugar beet — wheat — barley crop-rotation was studied. K-rates below crops K-uptake led to a distinct decline in soil fertility. Sugar beet as well as wheat showed an average yield decrease of 35% and 12%, resp. during the whole trial period. FYM increased the yield level especially of sugar beet, but did not affect the optimum K-rate. With negative K-balances and a falling K-content in the soil, sugar yields decreased over the whole trial period combined with a lower sugar content in the roots. For that reason the efficiency of K-fertilization increased with the duration of the experiment. At the described site an extractable K-content of about 250 ppm K2O was optimum. In order to maintain this soil-K-value a K-application rate exceed the K-removal by 45 kg K2O/ha/year was necessary.

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Technological quality of sugar beets under influence of FYM and potassium fertilization in a permanent field trial

100%

Sienkiewicz S., Krzebietke S., Wojnowska T., Panak H., Czapla J.

Fragmenta Agronomica

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2005

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tom 22

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nr 1

5

The effect of soil conditioners on yield of dry matter, protein, and sugar in grass

80%

Jankowski K., Truba M., Wisniewska-Kadzajan B., Sosnowski J., Malinowska E.

Acta Agrophysica

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2018

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tom 25

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nr 1

6

Dlugosc wegetacji burakow decyduje o plonach korzeni i cukru

71%

Kostka-Gosciniak D.

Agrochemia

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1999

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nr 10

11-12

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Produkcyjne i ekonomiczne efekty ochrony burakow cukrowych przed Cercospora beticola

61%

Borowczak F., Grobelny M., Zielinski T.

Progress in Plant Protection

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2003

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tom 43

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nr 2

542-544

Ograniczanie wyników

Adaptations of Lamium album L. flowers to pollination by Apoidea

Flowering dynamics, nectar secretion and insect visitation of Phacelia campanularia A. Gray

Effect of different K-supply on sugar beet production and soil fertility in a long-term fertilizer experiment

Technological quality of sugar beets under influence of FYM and potassium fertilization in a permanent field trial

The effect of soil conditioners on yield of dry matter, protein, and sugar in grass

Dlugosc wegetacji burakow decyduje o plonach korzeni i cukru

Produkcyjne i ekonomiczne efekty ochrony burakow cukrowych przed Cercospora beticola