Hrátky s mikulášem

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Ručně kreslený plakát vytvořila Lenka Kupková.

Unterhaltung & Humor

Statutární mě Brno finančpodporuje Knihovnu JiřMahena v Brně
sto ně ího ,
př vkovou organizaci. Č
íspě innost poboč
ky "Na Kř
iž
ovatce" finančpodporuje
ně
MČ - stř
Brno ed.

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Ольга Максимова

Development of drought-tolerant maize varieties with high and stable yields is very imperative as being affordable alternative to many smallholder farmers. Drought-tolerant maize varieties belonging to two maturity groups (10 early and 10 late/intermediate) were evaluated for yield and other related characters in the southern guinea savannah (SGS) of Nigeria for two years. Days to flowering were higher in the second year than the first year. Consistent number of days (3 days) was recorded for anthesis-silking interval in both years. Plant and ear heights are greater in 2008 than 2007. However, plant and ear aspects were fair in overall phenotypic appeal and grain yield was not significantly difference in both years. Maize grain yield in late/intermediate varieties is significantly higher than the early with a difference of one tonne. High grain yield recorded in two varieties each among the early (AC 90 POOL 16 DT STR and TZE-Y DT STR C4) and late/ intermediate (DT-SR-WC0 F2, SUWAN-1-SR-SYN) varieties was approximately 4.6 t/ha. These genotypes could be used either as cultivar per se to escape the prolonged moisture stress during the later part of the cropping season or introgressed with favourable cultivars for high yield adaptable to drought-prone areas in SGS ecologies.

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Twenty two genotypes of quality protein maize (QPM) and two local checks were assessed for their lysine and tryptophan levels, as well as grain yield characteristics at the Lower Niger River Basin Development Authority station, Oke-Oyi, Ilorin, Nigeria for three years (2009-2011). The results showed that the QPM genotypes and the standard checks varied from one another, with respect to crude protein, zein dry matter, zein crude, lysine and tryptophan. The best QPM hybrids for grain yield (Dada-ba, ART98-SW5-OB, ART98-SW4-OB and TZPB-OB had percentage lysine and tryptophan advantage of 34% compared with the local checks. These hybrids also out-yielded other genotypes with yield advantage of 10, 24 and 26% over the best inbred, open pollinated variety and the standard check respectively. However, grain yield showed positive association with all the characteristics except crude protein content. Kernel number per cob had maximum correlation with grain yield followed by kernel rows per cob, cob diameter and cob weight. The direct effect for crude protein was positive but the correlation was negative. Conclusively, the QPM hybrids that combined high yield with the essential amino acids could be tested in different savanna agro-ecologies to identify those that could be released to farmers, while the superior inbreds could be introgressed for further breeding programs.

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Hrátky s mikulášem

1. Statutární mě Brno finančpodporuje Knihovnu JiřMahena v Brně sto ně ího , př vkovou organizaci. Č íspě innost poboč ky "Na Kř iž ovatce" finančpodporuje ně MČ - stř Brno ed.