Zinc availability in the presence of boron and humic fractions

Rabar, Francesca Norbert (2010) Zinc availability in the presence of boron and humic fractions. [Project Paper] (Submitted)

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Abstract

Zn deficiency is one of the major problems in most crops. It is the most widespread of all micronutrient deficiency problems as compared to other micronutrients element. In the soil, Zn availability is affected by presence of an anion, Boron, soil pH and humic fractions. This study wa carried out to determine the relationship between Zn availability with different humic and fulvic acids concentrations and its interactions in the presence of B. Different amounts of humic acid (0.3 g, 0.6 g and 0.9 g), fulvic acid (3 mL, 6 mL and 9 mL), and mixed humic and fulvic acid levels (0.3 g and 0.3 mL ; 0.6 g and 6 mL ; 0.9 g and 9 mL) was applied into the soil which has been applied with 10 mg/kg of zinc sulphate and 10 mg/kg of boric acid. Experiments were carried out for fifteen days of incubation periods and were collected every 3 days. Soils were then further analysed for the availability of Zn and exchangeable cations K, Ca, Mg and Na, pH in water and in KC1. This study showed that higher amounts of humic fractions of either humic acid alone, fulvic acid alone or mixed humic and fulvic acids has decreased the availability of Zn thus causing the soil to become more acidic as soil pH. The results of this experiment have shown decrease in Zn availability with the increase of treatments applied and increased with the decrease in the amounts of treatments applied. The increasing amount of treatments applied has shown to lower the pH value of the soil thus making the soil to become more acidic. Availability of exchangeable cation Na has increased with the increasing amount of treatments applied. The presence of B decreased the availability of Zn in the soil due to the interactions between anion B and cation Zn. Zn is also less available in the soil because of the actions of chelating potentials of humic fractions that held cations Zn in the soil and will only release them when needed by plants.

Item Type:	Project Paper
Subjects:	S Agriculture > S Agriculture (General) S Agriculture > SB Plant culture
Faculty:	Faculty of Agriculture and Food Sciences
Depositing User:	Mr. Mohd Faizal Jabat
Date Deposited:	11 May 2026 02:02
Last Modified:	11 May 2026 02:02
URI:	http://psaspb.upm.edu.my/id/eprint/2752

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