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استجابة نبات الذرة الصفراءZea mays L. للتلقيح ببكتريا الازوتوباك Azotobacter chroococcum في التربة المعاملة بالمادة العضوية ومستويات من النتروجين == RESPONSE OF CORN (Zea mays L.) TO INOCULATION WITH (Azotobacter chroococcum )IN SOIL TREATED WITH ORGANIC MATTER AND NITROGEN
Author name:
حسن علي طاهر الهلالي
Supervisor name:
عبد الزهرة طه ظاهر
General topic:
Agricultural sciences
Specific topic:
Soil and Water
Degree:
Master
University:
University Of Basrah - Faculty Of Agriculture - Department Of Soil Sciences And Water Resources
Language:
Arabic
University location:
Basrah
First pages:
31T1776 - p.pdf
Abstract:
Twelve isolates of Azotobacter as free nitrogen fixing bacteria were isolated from rhizosphere of different plants and soils in (Thi - Qar and Basrah province) ,two strains were brought from (Thi - Qar university - College of Sciences) and one strain was brought from Ministry of Agriculture ( imported from Italy), all strains were diagnosed by studying biochemical , microscopical and morphological characteristcs .strains (A1,A21and AB) gave maximam efficiency of nitrogen fixation then were used for inoculanting seeds of corn.Agricultural experiment was carried out during spring season 2014 in research station of College of Agriculture - Basrah University in loam soil using CRD design with three replicates to study response of corn for inoculation with Azotobacter intergraded with organic fertilizer (0, 30) ton hectar - 1 and nitrogen fertilizer levels(0,80,120and160) kg N hectar - 1of which represented of (0,50,75,100)% of recommended completed of nitrogen fertilizer(160)kg N hectar - 1.After tow months of growing ,plants were scythed .then dried and estimated : heigh plant, length of root , dry weigh for plant and root, (N,P,K) uptake in plant and root , number of Azotobacter, total residual nitrogen in soil polts.Results obtained from this study : - 1 - A1 locally isolate showed superiority over the rest used isolates in height plants , length root,dry weight of plant and root, (N) uptake in vegetative part in corn and soil total nitrogen residual percentage 18.3%,56.1%,13.6%,64.4%, 56.9% respectively compared with control.2 - Use treatment(A1N2M1) lead to increase height plants , length root,dry weight of plant and root, (N) uptake in vegetative part in corn, number of Azotobacter and soil total nitrogen residual 3 - A21 strain showed superiority over the rest used strains in phosphorus and potash uptake of vegetative part percentage 62.6% and 61.2% respectively.4 - Treatment(A21N2M1) excelled significantlly in phosphorus and potash uptake of vegetative and root of plant .5 - Inculation whith three isolates and adding organic matter (singular or mixed) lead to significant increase all characteristcs studied.
