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Register a new userEffect of Humic Substances on Micronutrients Availability in Soils
تأثير المواد الهيومية في تيسر المغذيات الصغرى في التربة
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تحولت مساحات واسعة من الأراضي المروية في سورية من الزراعة الواسعة إلى الزراعة المكثفـة خلال الفترة الأخيرة. و أصبحت أنواع عديدة من الترب غير قادرة على إمداد أصناف المحاصـيل عاليـة الغلال باحتياجاتها من المغذيات الصغرى. نتيجة لذلك ظهر نقص واضح للزنـك و البـورون و المنغنيـز و الحديد في كثير من تلك الترب. و من المعروف أن المواد الهيومية (الدبالية) تؤثر فـي تيسـر المـواد الصغرى من خلال تكوين المخلبيات chelating و يعمل هذا على زيادة تيسر تلـك المغـذيات أو علـى نقصه. ضمن هذا الإطار نُفذت تجربتا أصص في محطة الدفيئات التابعة لجامعة بليموث عام (2006) لدراسة تأثير إحدى المواد الهيومية التجارية واسعة الانتشار في سورية في تيسر أربعة عناصر مغذية صـغرى هي: الحديد و المنغنيز و الزنك و النحاس، و استعملت عينات سطحية مركبة من التربة، جمعت من التـرب المتغيرة القلابة Cambisols Vertic في محافظة درعا، و أخرى مـن التـرب المتغيـرة المغسـولة أو المتدهورة Cambisols Dystric في منطقة ديفون جنوب غرب انكلترا.
During the last decades a large area of irrigated lands in Syria has been shifted from extensive cropping to intensive agriculture. Many kinds of soils became incapable to supply high yield crops by their micronutrients requirements. Therefore, the deficiency of Zn, B, Mn and Fe was mentioned in this soil. Humic substances influence micronutrients availability through chelating, which can either increase or decrease the availability of the micronutrients (MN). In this framework, two pot experiments were carried out in a greenhouse at the University of Plymouth (2006) to investigate the effect of a commercial humic substance (HS) on the micronutrients availability of: Fe, Mn ,Zn & Cu in two composite surface soil samples collected from Vertic Cambisols ,southwest of Syria & from Dystric Cambisols, southwest of England.
References used
(Abu Nukta, F. (1994). Soil humus. In: Pedology. pp. 163-184. Damascus University Pulications. (in Arabic
Abu Nukta, F. (1995). Environmental impact of fertilizers use in Syria. Proc. Seminar, production & use of chemical fertilizers and environment. Cairo. Eds. M. M. El-Fouly and F.E. Abdalla, pp35-50
(Abu Nukta, F. (2004). Soil classification; The soils in Syria. In: Principles in Soil Science. PP.197-262, Damascus University Publications.(in Arabic
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In order to implement this research soil profiles selected on a toposequence
were systematically collected from different geohorizons. Results indicated that
topographical factors played important roles in determining some soil features
such as th
e depth, texture distribution of CaCO3 and the fertility matter. The
study showed that the soil content of minor element was ranged between
moderate to low, and this may be related to the mineralogical composition of
the parent rock and weathering status and to the use of these elements by the
plants uptake during the long lasting exploitation. The results also indicated
that the decrease of these elements was consistent with the decrease of
elevation, such as heading from the slop to the plain. This probably also due to
the relation between the leaching process and topographical position and to a
less extend to the pH of the soil.
This paper aims at investigating the effect of organic matter
content on the engineering properties of the soil.
The effect of the organic matter on both the consistency limits and strength have been investigated. The results show that the organic
matter increases both the plasticity and the strength of soil.
Mathematical formula is presented in which the unconfined
compression strength of the soil is related to the organic matter
content. It was concluded that increasing the organic matter
content increases the displacement corresponding to the maximum shear stress. In addition, the effect of the organic matter has been studied and the results show that the organic matter increases the compressibility of the soil.
Stabilizing the soil with cement has been investigated as well. The
results show that adding the cement to the soil improves the
strength of the soil and decreases its swelling potential.
Depending on the organic matter content, a mathematical formula
is presented to determine the required cement ratio to treat the
soil to decrease its swelling potential.
Clayey expansive soils are fine grained soil with a low strength. Its
swelling potential and shear strength are significantly affected by
the water content.
This research aims to study the effect of the initial water content
on both shear strength and the required displacement to reach the
maximum strength.
The experiment was conducted during the two seasons (2015 , 2016 ) on the Lemon trees
cv (Meyer ) aiming at studying the effect of the foliar spraying with the nutrients ( boron ,
zinc and iron ) on physical and chemical properties of the fruits Th
ese nutrients were
sprayed separately or as a mixture .
The average of each of the physical properties of the fruit (length , width , firmness,
volume and weight of the fruit ) , in addition to rind thickness and the fruits ` juice volume,
,the chemical properties of the fruit juice (total soluble solids, total sugars, total acidity,
vitamin C) were studied. An increase was observed in all the studied parameters in the
sprayed treatments compared to the control from( 6.37%- 3.33% -0.37% -
34.57mg%)to(9.33% -4.88% -1.89% -43.5%) in the first season and( 9.75% 5.87- 3.32% -
45%) in the second season, respectively. As a result of the statistical analysis, there were
significant differences between all the studied treatments and the control with overpass of
the treatment of the three elements (iron chelate + boron oxide + zinc chelate ) of all
treatments in the most of the studied figures in both seasons. Statistical analysis of the fruit
rind thickness showed the absence of the significant differences among the studied
treatments.
نفذ البحث خلال الفترة 2013-2016 م في كلية الزراعة بجامعة دمشق , بهدف دراسة تأثير المعاملة ببعض المواد الكيميائية والطبيعية ( 1- ميثيل سكلو بروبان , ونتروبروسيد الصوديوم , الشيتوزان , وأمينوفينل علايسين , والميثيل جاسمونات , وفيتامين E ) في القدرة الت
خزينية لثمار البندورة ( الهجين Tala ) وصفاتها البيوكيميائية ( نسبة المواد الصلبة الذائبة TSS ونسبة الحموضة القاتلة للمعايرة TA ) والفيزيائية ( الصلابة ونسبة الفقد بالوزن والفقد المطلق ومؤشرات اللون ) ومعايير الأكسدة ومضادات الأكسدة .
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