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العنوان
Studies On Some Soil Enhancers Used In Arid Regions /
المؤلف
Elmahdy, Manal Hassan Mohamed Ibrahim.
هيئة الاعداد
باحث / منال حسن محمد ابراهيم المهدى
مشرف / فريدة حامد ربيع
مشرف / أحمد عبدالقادر طه
مشرف / محمد علي عثمان
تاريخ النشر
2020.
عدد الصفحات
124 p. :
اللغة
الإنجليزية
الدرجة
الدكتوراه
التخصص
علوم التربة
تاريخ الإجازة
4/5/2020
مكان الإجازة
جامعة عين شمس - كلية الزراعة - علوم الأراضي
الفهرس
Only 14 pages are availabe for public view

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Abstract

The current work is interested in studying the nature of some selected soil amendment enhancers in the laboratory in terms of some mineralogical initial characters, i.e., their X-ray diffraction as well as their response to the metal bioleaching due to the inoculation with P or K- solubilizing bacteria and/or their co-culture. Furthermore, studying their effect on P & K uptake of maize plants and the soil available P & K in a greenhouse experiment. In addition, a field experiment was laid out to evaluate their effect on maize growth, maize ear yield, maize seed yield. The obtained results could be summarized as in the following:
1- Laboratory work:
1.1. Bioleaching of K from feldspar, bentonite and biochar:
Any of Bacillus circulans, Serratica mercescenes, Pseudomonas fluorescence and their co-culture mixture was able to act as bioleaching agent to liberate K from any of feldspar, bentonite and biochar. Their Co-culture mixture recorded the highest available bioleached K amount from biochar followed by those scored by Ps. fluorescence, B. circulans and Serratica mercescenes in respective order compared to control without inoculation. Also, the bioleached available K amount from biochar was much higher than that bioleached from feldspar.
1.2. Bioleaching of P from rock phosphate and biochar:
- Both Bacillus polymyxa and Bacillus megaterrium and their co-culture and/or their co-culture ware able to release P from rock phosphate and biochar.
- Inoculation with co-culture bacterial mixture achieved the highest amount of available bioleached P from rock phosphate. This available bioleached P from rock phosphate was quite higher than that leached by biochar.
2- Greenhouse work:
- Using biochar alone at 3 tons fed-1 gave the highest mean value for maize plant dry weight, plant height, P & K plant uptake and soil available, P & K.
- Using rock phosphate alone recorded the highest mean values for maize plant dry weight and maize plant height, P plant uptake and soil available P.
- Using feldspar alone gave the highest mean value K plant uptake and the highest mean value of soil available K.
- The interaction between any of bentonite and biochar each applied at a rate of 3 tons fed-1gave the highest maize plant dry weight.
- The interaction between any of rock phosphate and biochar each applied at a rate of 3 tons fed-1gave the highest maize plant height, P plant uptake and soil available P.
- The interaction between any of bentonite and biochar each applied at a rate of 3 tons fed-1gave the highest maize K plant uptake.
- The interaction between any of feldspar and biochar each applied at a rate of 3 tons fed-1gave the highest maize soil available K.
3- Field work:
- Using biochar alone at 3 tons fed-1 combined with bacterial inoculation gave the highest mean value for maize plant dry weight, plant height, P & K plant uptake, soil available, P & K, maize ear yield, and maize seed yield compared to those recorded by same treatment without bacterial inoculation.
- Using rock phosphate recorded the highest mean values of for maize plant dry weight, plant height, plant P uptake; soil available P, maize ear yield and maize seed yield compared to those obtained by the un-inoculated treatments.
- Using feldspar along with bacteria inoculation recorded the highest mean value of maize plant K uptake compared to those recorded by same treatment without bacterial inoculation.
- Using bentonite along with bacteria inoculation recorded the highest mean value of soil available K compared to those recorded by same treatment without bacterial inoculation.
- . The interaction between any of rock phosphate along with bacterial inoculation and biochar each applied at a rate of 3 tons fed-1gave the highest maize dry weight, plant height, plant P uptake, soil available P, maize ear yield and maize seed yield.
- The interaction between any of feldspar along with bacterial inoculation and biochar each applied at a rate of 3 tons fed-1gave the highest maize plant K uptake and soil available K.