Year: 2014
Type: article
Abstract: Egyptian cotton growers are facing an unavoidable problem of late planting of cotton.To address such problem, four barbadense genotypes; two long staple [cultivar G86 and promising line of the cross (10229 x Giza 86)] and two extra long staple [cultivar G88 and promising line of the cross (Giza 84x G70xG51BxPima62)] were grown in three planting dates (April 15, April 30 and May15) at Nile Delta cotton zone, Egypt, during two successive seasons 2012 and 2013.Research objectives were to determine planting date effects on the performance of selected genotypes, data variability, and relation with air thermal units.The results showed that the PDs and genotypes had less effect on the data normality in both seasons with few exceptions.Slightly negative to positive skewness and kurtosis were observed.Moderate to high variability (CV %) was observed in yield determinants; while moderate to low variability existed in fiber and yarn determinants.Planting date (PD) and genotype (G) influenced significantly (P<0.01)yield, fiber and yarn variables.However, the PD x G interaction was not significant for most lint and yarn traits.With the exception of plant height and yarn evenness, mean performance of yield and fiber determinants of genotypes declined by delaying planting date.The delayed planting from 30 April to 15 May had more adverse effect on most traits than the delayed planting from 15 to 30 April.For example, seed cotton yield per plant lost 6.38 and 9.15 gm in the first season compared with 8.14 and 8.47 gm in the second season due to the first and second 15-day delay of planting, respectively.Except for yarn traits, response curves showed linearly negative effects of delaying planting on cotton yield and fiber traits in the two seasons.The two promising crosses were significantly better than their corresponding cultivars especially in yield and its attributes.Averaged over the two seasons, heat units efficiency use (HUE) measured as a number of open bolls/plant corresponded to each accumulated heat unit (AHU) were 106.14, 129.15 and 164.41 hu/boll for the first, second and third planting dates, respectively.Discussion on yield and its attributes, fiber and yarn properties pointed out that the two promising crosses possessed potential to tolerate conditions of late planting, suggesting their use to replace the present cultivars and utilize in breeding program aimed at developing barbadense genotypes to grow under late planting of agroclimatic conditions of the River Nile Delta.
Institutions: Cairo University, Agricultural Research Center
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: diamond
OpenAlex ID: W4210264523