Keywords : plant densities


EVALUATE THE PERFORMANCE OF DOUBLE, SINGLE HYBRIDS AND INBREDS OF MAIZE UNDER DIFFERENT PLANT POPULATION AND ESTIMATE HETEROSIS AND HYBRID VIGOR (SOME AGRONOMIC TRAITS)

ANBAR JOURNAL OF AGRICULTURAL SCIENCES, 2018, Volume 16, Issue 1, Pages 817-835
DOI: 10.32649/aagrs.2018.153331

field experiment was conducted during the fall season 2017 at the fields of Field Crop Department - College of Agriculture - University of Baghdad in order to evaluate the performance of double, Single hybrids, and their inbreds of maize (ZM43WIZE, ZM60, ZM49W3E, ZM19, and CDCN5) in two plant densities. The Study included the comparison among five inbreds, ten single hybrids, and fifteen double hybrids. The experiments were conducted according to the randomized complete block design (RCBD) with four replication, using the spilt plot treatment arrangement, where the two densities 60 and 80 thousand plants h-1 were randomized in the main plots and the 30 genotypes in the subplots. The results showed the superiority of the single and double hybrids over their inbreds in all the studied traits. The earliest single hybrids (ZM43WIZE × ZM19) in tassling and silking reached 56.33 and 60.33 days respectively. The double hybrid (ZM43WIZE × ZM19) (ZM49W3E × CDCN5) To reach the tassling was 56 days and did not differ between the hybrids among them in access to silking and the earliest (ZM43WIZE × ZM49W3E) (ZM60 × CDCN5) with a period of 60.17 days. The earliest single hybrids and the double hybrids had negative heterosis and hybrid vigor (ZM49W3E × CDCN5), (ZM43WIZE × ZM49W3E) and (ZM43WIZE × ZM19) The highest mean plant height was 245.9, 233.9 and 231.6 cm respectively, which is higher than the general mean. (ZM43WIZE × ZM49W3E) The highest mean ear height was 107.87 cm followed by the hybrid (ZM49W3E × CDCN5) which reached 107.05 cm and the hybrid (ZM43WIZE × ZM19) which was 101.77 cm and did not differ significantly, the hybrid (ZM43WIZE × ZM60) (ZM49W3E × CDCN5) by giving the highest height of the plant reached 295.9 cm while the double hybrid gave the(ZM60 × CDCN5) (ZM49W3E × ZM19) the highest average ear height reached 112.45 cm followed by the double hybrid (ZM43WIZE × ZM19) (ZM60 × ZM49W3E). The single hybrid ) ZM60× ZM49W3E (giving it the highest mean of 16.28 leaves number followed by the hybrid (ZM60 × 5) by 16.03 leaves and did not differ significantly from the remaining hybrids except for the hybrids (ZM43WIZE × ZM19) and (ZM60 × ZM19) gave least leaves number (15.25 and 15.17) sequence. (ZM60 × ZM19) (ZM49W3E × CDCN5) by giving the highest number of leaves of 17.08 leaves followed by (ZM43WIZE × ZM19) (ZM49W3E × CDCN5), (ZM43WIZE × ZM60) (ZM19 × CDCN5) , (ZM43WIZE × CDCN5) (ZM60 × ZM19), (ZM49W3E × ZM60) ( ZM19 × CDCN5), (ZM60 × CDCN5) (ZM49W3E × ZM19) and (ZM43WIZE × CDCN5) (ZM49W3E × ZM19), reaching 16.48, 16.38, 16.37, 16.33 and 16 .27 and 16.23 respectively, which is higher than the general average and the average inbreds and the average of the single and double hybrids . Most of the single and superior double hybrids were characterized by the height of the plant and the ear and the number of leaves by the positive hetrosis and hybrid vigor in the desired direction.

Genetic variation and analysis of path coefficient of some traits of wheat under three plant densities

Omar H. Al-Rawi; Hadil Sabbar; Mohammed H. Al-Issawi

ANBAR JOURNAL OF AGRICULTURAL SCIENCES, 2015, Volume 13, Issue 1, Pages 254-264
DOI: 10.32649/ajas.2015.120026

A field experiment was conducted in a farmer field in Alneaamia region/Fullujah/Anbar governorate, during the winter season 2012-2013. Seed of four cultivars of durum wheat (Abu-Gariab, Aliraq, Tahady and Alezz) was planting under three planting rates (100, 130 and 160 kg.ha-1). Split plot arrangements in RCBD design were used. The objective of this study was to determine the more effective traits in grain yield, which were considered it as a selection index to improve grain yield in wheat. The result of analysis of variance showed that there is a highly significant difference for all studied traits for all planting rate. The value of genetic variance was highly than environment variance for all traits and it was increase with increase of planting rates exception of leaf area which was decrease of its genetic variance with increase of planting rate. Number of spick.m-2 gave highly broad sense heritability (0.956) for planting rate (130 kg.ha-1) and number of grain.Spike-1 (0.902) for planting rate (160 kg.ha-1).
The value of standard coefficient variance and genetic, phenotypic covariance was contrast with planting rate, there is highly value of its in grain yield and number of grain.spike-1. There is positive genetic, phenotypic and environment correlation concern between yield and number of spick and number of grain and there is a negative correlation between yield and leaf area and weight of 1000 kernel at planting rates (130 and 160 kg.ha-1) while there is a positive and highly correlation of environment between yield and number of grain.spike-1 and weight of 1000 kernel at the three planting rate. The path coefficient analysis showed are the number of spick have a highly direct positive effected (1.339, 1.273 and 0.776) at the three planting rate respectively, as well as the total of effects (0.982, 1.095 and 0.965). The number of grain spick-1 gave highly positive indirect effects (1.365) among number of spick at 130 kg.ha-1

COMPETITIVE ABILITY OF SOME SOYBEAN CULTIVARS UNDER DIFFERENT PLANT DINSITIES WITH WEEDS AND THEIR EFFECTS ON YIELD, AND YIELD COMPONENTS

Faik T. AL-Chalabi; Abdul-Lateef M. AL-Kaisy; Jasim M. AL-Jumailly

ANBAR JOURNAL OF AGRICULTURAL SCIENCES, 2013, Volume 11, Issue 2, Pages 339-358
DOI: 10.32649/ajas.2013.87260

A field experiment was conducted at a field located in Ramadi city/ Al-Anbar province during the growing seasons of 2010 and 2011, to evaluate the potential variations in growth traits of some soybean cultivars and its role in determining of competitive ability of these cultivars to accompanied weeds and their inpact on yield and yield components.. The study involved four different weed treatments (weedy, weed free,Treflan EC45% herbicide spray at recommended concentration(1.152 g.ha-1)and half of recommended concentration, respectively) as main treatments, whereas, sub plots involved two plant densities which were (400000 plants.ha-1) and (266666 plants.ha-1). Sub-sub plots comprised of four soybean cultivars (Ls 75, Lee 74, Giza 111 and Giza 35).For soybean cultivars, Giza 111 characterized with its ability to reduced weeds density and its dry weights, and increased control percentage of the accompanied weeds in a degree better than other cultivars under study. This cultivar achieved higher mean values for no. of pods (86.58 and 92.51 pod. plant -1), 100 seed weight (14.39 and 14.27 g) for both seasons, respectively. This was positively reflected in total yield characterizing this cultivar by showing higher means (3.422 and 4.085 t. ha-1). This gave an indicator that this cultivar had an ability to tolerate weed competition comparing with Ls 75 cultivar which recorded the lowest means for most studied traits. Most of soybean cultivars showed a response to the different treatments of weed control higher than their response to plant densities in reducing accompanied weed density. However, weed density significantly decreased in the highest crop density (D1) comparing with lowest density (D2) during the period 90 days in both seasons. The density ( D1) gave highest seeds yield ( 3.66 , 4.26 t. ha-1).