Evapotranspiration of osteospermum Denebola and New Guinea impatiens Timor grown on ebb-and-flow benches as affected by climate conditions and soil water potential

• Autorzy: Treder J , Nowak J
• Języki publikacji: EN

Abstrakty

EN

Daily evapotranspiration (EVPT) of two bedding plants osteospermum 'Dened impatiens 'Timor' grown on ebb-and-flow benches was measured by weighing method, together with assessment of indoor climate parameters (solar radiaperature, humidity) and leaf area index (LAI) at different growth phases. The 'on inside the greenhouse as affected by climatic factors i.e.: solar radiation, re, humidity and air velocity was also measured using Piche's evaporome:ts were irrigated according to soil water potential (irrigation at -0.5; -3; -ID 'a). Irrigation at high water potential decreased plant growth and leaf area of lts. LAI of osteospermum decreased as water deficit increased. In the case of .,~ the highest LAI at full flowering obtained plants irrigated at -3 kPa. actual, daily EVPT of plants irrigated at -0.5 kPa increased with plant growth in the case of osteospermum while that of impatiens remained at similar level. At flowering water stress decreased strongly EVPT of osteospermum and in lesser " . of impatiens. Osteospermum irrigated at -0,5 kPa had 2,5 higher EVPT than impatiens. For both plants good, positive correlation between EVPT and daily mean temperature between 7-17 h and evaporation according to Piche' s evaporometr readings were obtained. As expected EVPT was negatively correlated with relative irrespective the growth phase and soil water potential. The correlation and solar radiation, was changed during plant growth due to differences in temperature under shading screen, used during sunny days.

PL

Zbadano w warunkach laboratoryjnych różne aspekty oddziaływania saponin z lucerny siewnej, Medicago sativa L. na larwy stonki ziemniaczanej. W badaniach zastosowano wodne roztwory (0,5; 0,1; 0,01 i 0,001%) sumy saponin wyodrębnionych zarówno z korzeni jak i z części nadziemnych lucerny, które podawano 12-godzinnym larwom L , metodą ekspozycji na traktowanych liściach ziemniaka. Przeprowadzone badania wykazały, że saponiny lucerny włączone do diety larw stonki ziemniaczanej obniżały żerowanie, wzrost i przeżywalność badanych owadów. Aktywność biologiczna tych związków była ściśle skorelowana z dawką. Larwy hodowane na liściach traktowanych 0,5% roztworem praktycznie nie żerowały i ginęły po 4-6 dniach. Niższe dawki saponin (0,01 i 0,001%) w mniejszym stopniu ograniczały żerowanie owadów, wpływały jednak hamująco na ich wzrost. Obserwowany, zdecydowanie mniejszy przyrost masy ciała w porównaniu z ilością pobranego pokarmu sugeruje, że saponiny zakłócały procesy trawienia i przyswajania. Stosowane związki powodowały również przedłużenie stadium larwalnego oraz śmiertelność na poziomie 76,7 - 100 %. Nie stwierdzono większych różnic w aktywności saponin związanych z miejscem ich występowania w roślinie.

Słowa kluczowe

EN

soil water; impatiens; climate condition; New Guinea impatiens; osteospermum; water potential; evapotranspiration; leaf area

• Wydawca: -
• Czasopismo: Acta Agrobotanica
• Rocznik: 2001
• Tom: 54
• Numer: 2
• Opis fizyczny: p.47-57,fig.

Twórcy

autor

Treder J

• Research Institute of Pomology and Floriculture, 96-100 Skierniewice, Pomologiczna 18, Poland

autor

Nowak J

• Research Institute of Pomology and Floriculture, 96-100 Skierniewice, Pomologiczna 18, Poland

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