Effect of Seeds source and Soil type on Seeds germination and Seedlings Establishment of Acacia polycantha (Willd) North Kordofan State, Sudan

الموضوعات

علوم بيئية

الملخص

This study was carried out during 2007/2008 in the nursery and experimentalfarm of Gum Arabic Research Center, University of Kordofan at El Obeidtown, North Kordofan State, to study the effect of seed sources and soiltypes on seed germination and seedlings establishment of Acaciapolycantha. Seeds were collected from three areas: South Darfur; SouthKordofan and Blue Nile states.The study consisted of seed dormancy breakage test by several methods(pretreatment with soaking in cold and hot water, corroding by 25% and50% conc. H2SO4, and itching by electrical needle); the seed were plantedin the nursery in different soil types (sand, clay and mixture) and fieldestablishment of the species through direct seed sowing and seedlingtransplantation.The seeds from South Darfur failed to germinate, and did not thrivesatisfactorily both in the nursery and in the field, and thus were excludedfrom the experimentation.Seeds treated by electric needle test gave the highest germination percentage(60%). Treatment with H2SO4 25 gave the lowest values (20%), even (10%)xlesser than that of the control and cold water. The electric needle and theboiling water were effective treatment for Acacia polycantha seed dormancybreakage. The cold water and 50% conc. H2SO4 gave identical values.The seed source obviously had little effect on Acacia polycantha seedgermination except for the control from Blue Nile which was twice strongerthan that of South Kordofan.The study showed that there were significant differences among the types ofsoils in measured parameters in the nursery.The seedlings length in themixture was better than in the sand. Little difference was observed betweenseedling length in the mixture and the clay, but the difference between themixture and sand was about 1.5 folds. Root length growth in the sandshowed better performance (32.1cm) and fallowed by clay and mixture.Shoot/root length ratio was similar in the clay and the mixture but that in thesand was the lowest. Seedlings of the mixture had denser foliage than thoseof clay and sand. Shoot dry weight was significantly different between themixture and sand, while there was no difference between both mixture andclay and clay and sand. Seedlings in the sand had the lowest shootmasses.The shoot/root weight ratio, in the sand was far lower than that ofclay and mixture; this difference exceeded 3.7 folds.xiFor the seeds source, the Blue Nile seedlings length was higher than those ofSouth Kordofan by a difference of 4.1 cm. Like wise a significant differencewas obtained between the seedlings root length of the two locations; here theSouth Kordofan seedlings developed longer root lengths by a difference of3.4 cm on average. The shoot/root length ratios of the seedlings of the twolocations were 1.8 and 1.4 for Blue Nile and South Kordofan, respectively.For the shoot and root dry weights, the respective difference of magnitude inthe mass values of these parameters was 0.7 and 0.8 g. For the shoot/rootweight ratio, the Blue Nile seedlings were higher than those of SouthKordofan, by a difference of 0.6.NPK and organic carbon content in the seedlings showed, no significantdifferences between South Kordofan and Blue Nile; also there were nosignificant difference between the soil type (Mixture and Sand) but the claydiffered from the others in Potassium and organic carbon.Direct seed sowing in the field failed to germinate which was attributed tothe poor sandy soil conditions and drought conditions.The study showed that there were no significant differences in the studiedparameters for the seedlings transplanted in the field except for the rootcollar diameter; which was better in mixture fallowed by sand and clay. Forthe two seed sources there were no significant differences in diameter andxiinumber of leaves, but there were significant differences between them inseedlings length which was taller for Blue Nile than South Kordofan source.The study concluded that seed dormancy of Acacia polycantha can be easilybroken by available pre-treatment methods, particularly hot water andelectrical needle itching. Nursery seedling stock can be satisfactorily raisedin sand-clay mixture soils. Seeds from different areas had differentgermination and growth rates which might be considered as separateprovenances. Field establishment of Acacia polycantha in dry ecozones onsandy soils is very poor and better establishment may be obtained in morehumid areas as on clay or loamy soils. In view of the scanty informationabout this species and envisaging its apparent potential as gum producingtree, more research work is needed both for natural stands and plantations.

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التعريف والنوع

رقم الوثيقة

08f18508-7420-4e69-939d-0b12532d12f6

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل ماجيستير

نوع الملف

pdf text

أسماء الملفات

1637661_1.pdf

بيانات النشر

ألقاب المؤلفين

[{"name_ar":"دلدوم محمد","title_ar":"اشراف","title_en":"Supervision"},{"name_ar":"هبة عبدالله","title_ar":"اعداد","title_en":"Preparation"}]

اللغة

English

المصدر والدورية

اسم المصدر

Effect of Seeds source and Soil type on Seeds germination and Seedlings Establishment of Acacia polycantha (Willd) North Kordofan State, Sudan

المحتوى والصفحات

عدد الصفحات

0

إشراف وإعداد

الإشراف

دلدوم محمد

الإعداد

هبة عبدالله

الاقتباسات الببليوغرافية