فهرست مطالب

Azarian Journal of Agriculture - Volume:6 Issue:4, 2019
  • Volume:6 Issue:4, 2019
  • تاریخ انتشار: 1398/09/10
  • تعداد عناوین: 4
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  • Mahmud Sani*, Ibraheem Alhassan Pages 80-85

    This study was designed   to find out the influence of soil texture and depth on soil volumetric moisture retention (𝜃) in percentage at three matric potentials (0, 0.3, and 15 bars suction) and Plant Available Water Content (PAWC) on Nigerian Northern Guinea Savannah (NGS) Alfisols. After laboratory moisture determination using pressure plate apparatus, descriptive statistics was employed to summarize the data of disturbed soils sampled   from four depth  (0-20cm; 20-40cm; 40-60cm; and 60-80cm), and grouped by surface layer textures into Sandy-Loam (SL), Loam (L), Loamy-Sand (LS), Sandy Clay-Loam (SCL), and Clay-Loam (CL). Generally, all the moisture characteristics increased with depth in the overall study area. Sandy Clay-Loam (SCL) however, retained the highest moisture at saturation (76.6±11%) in term of textural groups. For moisture retention at Drained Upper Limit (DUL), Drained Lower Limit (DLL) and Plant Available Water Content PAWC, Clay-Loam texture group retained the highest with 33.3±6, 18.6±4%, and 14.7±1% respectively. It could therefore be concluded that CL texture exhibited the ability to retain the most agriculturally important moisture characteristics, while the moisture availability itself increase down soil depth in NGS irrespective of its texture.

    Keywords: Drained Lower Limit, Drained Upper Limit, Northern Guinea Savannah, Plant Available Water Content, Saturation
  • Kouider Hadjadj *, Assia Letreuch Belarouci , Lakhdar Guerine , Mohamed Benaissa Pages 86-90

    The study of the descriptive parameters of the cork oak crown in Hafir forest (western Algeria) was carried out on 14 sample plots of 10 ares. Projection area, diameter, volume, maximum area, vital spacing quotient, crown competition factor, and ideal density were determined for each plot. The results obtained show that the studied settlements were composed mainly of small wood whose diameter varies between 7.5 and 22.5 cm. The cork oak crown is characterized by a diameter ranging from 1.85 m to 5.08 m, a projection surface ranging between 4.77 m2 and 35.28 m2, a volume of 3.50 m3 to 45.08 m3 and a maximum surface ranging from 4.48 m2 to 32.88 m2. Plots 7, 11 and 12 represent respectively 37%, 36% and 40% span scales, which results in a very strong competition between crowns. The ideal densities calculated for plots 1, 2, 3, 4, 5, 6, 8, 9, 10, 13 and 14 are higher than the current densities, so it is essential to practice reforestation operations. The opposite case is recorded for plots 7, 11 and 12 which have an excess of stems, hence the interest of starting thinning work.

    Keywords: Cork oak, Hafir forest, crown, thinning, reforestation
  • Rashma Afrose, Md. Majharul Hossain, Nurun Nahar Shahinur, Maruf Mostofa*, Md. Shamsuzzoha Pages 91-105

    The study was conducted to evaluate five female parents (lines) and eight male parents (testers) in a line x tester mating design at the research field of Sher-e-Bangla Agricultural University, Bangladesh, to estimate their gene action and heterosis for seed yield and yield contributing attributes in rapeseed. The data recorded on 40 F1’s and their parents for their combining ability indicated that the GCA effect was significant for primary branches per plant, secondary branches per plant, number of siliqua per plant, seeds per siliqua, thousand seed weight and seed yield per plant. High ratio of GCA and SCA variance was observed indicating a preponderance of non-additive gene effects in the inheritance of the yield and yield contributing characters under study. Among the lines Nap 9908 and Nap 94006 were found as good general combiners. Among 40 hybrids 16 were found as a good specific combiner for yield and yield contributing characters. Different types of heterosis, i.e. heterosis over mid parent (Hm), heterosis over better parent (Hb) and heterosis over the standard check (Hc) were estimated to evaluate forty hybrids for seed yield and yield contributing characters. The average heterosis for seed yield of forty hybrids over mid parent was 3.27% and that of better parent and the standard check was -9.72% and 5.60%, respectively.

    Keywords: Brassica napus, Combining ability, Heritability, Rapeseed, Yield
  • Ibraheem Alhassan * Pages 106-111

    The soils of Bade Local Government Area (LGA) of Yobe State, Nigeria were assessed to determine the micronutrient status and their relationship with pH, electric conductivity and organic carbon. Soil samples were taken from the five major district of the LGA at the depth of 0-20cm using soil sampling auger. The samples were then analyzed using the standard procedures. Results obtained indicated that the mean pH value was 6.45 with 2.97 % coefficient of variability (CV). The mean electric conductivity (EC) showed non saline (0.17dSm-1); while organic carbon (OC) content of the soils was very low (1.03g kg-1). Micronutrients mean concentrations indicated low limit for boron (B) (0.35mg kg-1), moderate values (0.24mg kg-1) for copper (Cu), high concentration of iron (Fe) (5.07mg kg-1) and manganese (Mn) (3.12mg kg-1), while zinc (Zn) was found to low (0.99mg kg-1) in the soils. All the assessed micronutrients showed moderate variability except Zn which is the least. Cu (r -0.243), Fe (r -0.370), Mn (r -0.028) and Zn (r -0.196) showed negative correlation with pH, while only B (r = 0.043) and Zn (r = 0.285) showed positive correlation with EC. Except for zinc all other micronutrients tested showed positive relationship with OC. The nutrient fertility index of the soils indicated moderate fertility level for B (1.95), Cu (1.80) and Fe (2.00), while Mn (3.00) and Zn (1.50) showed high and low fertility level respectively. The soil management strategies need to put into consideration micronutrients supplement and addition of organic matter.

    Keywords: Bade, correlation, micronutrients, Yobe, zinc