Volume 3, Issue 2 (2001)
JAST 2001, 3(2): 147-153 |
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Rezaei H, Malakouti M J. Critical Levels of Iron, Zinc and Boron for Cotton in
Varamin Rigion. JAST 2001; 3 (2) :147-153
URL: http://jast.modares.ac.ir/article-23-5579-en.html
URL: http://jast.modares.ac.ir/article-23-5579-en.html
1- Soil Science Department, Tarbiat Modarres University, Tehran, Islamic Republic of Iran.
Abstract: (6888 Views)
Cotton (Gossypium hirsutum L. cv. Varamin ) an important industrial crop of Iran, is
grown in 300,000 ha, with an average seed -cotton yield of 1750 Kg.ha-1. The main obstacle
in the way of increasing average cotton yield is imbalanced fertilizer use. Along with
urea and triple super phosphate, cotton growers also need K, Mg, Zn, Fe, Mn, Cu, and B,
so these elements’ critical levels should be determined in cotton fields. Field experiments
were conducted in 12 different fields in 1997 to determine critical levels of Fe, Zn, and B
in soil, and to study the effects of these micronutrients on the yield and quality of cotton in
Varamin region. The experiment design was a randomized complete block one (RCB)
with four treatments and three replications. Treatments were; NPK, NPK+Fe, NPK+Zn,
and NPK+B. Iron was applied as FeEDDHA (20 kg.ha-1), Zn as zinc sulfate (40 Kg.ha-1),
and B as boric acid (20 Kg. ha-1) prior to planting. Average seed cotton yield, lint yield,
seed index, and boll weight increased significantly by adding Fe, Zn, and B. In a cotton
field with higher soil B concentrations, cotton yield decreased with B fertilizer. Critical
levels of Fe, Zn, and B were determined based on Cate-Nelson graphical and analysis of
variance methods. In graphical method critical levels of Fe, Zn, and B were 4.8, 1.1, and
1.0 mg.Kg-1 soil, respectively, while on the basis of analysis of variance method, these levels
were 5.5, 1.1, and 1.3 mg.kg-1 soil, respectively. In one field, boll shedding decreased by
Zn and Fe treatments but was not affected by B addition. Iron to Zn ratio in cotton leaves
increased at Fe treatment and decreased in Zn treatments. Boron treatment increased B
content of leaves. Furthermore, zinc sulfate decreased B toxicity in the cotton leaves. In
short, applying micronutrients increased quality and yield of cotton in Varamin region.
Subject:
Soil Science
Received: 2010/05/16 | Accepted: 2010/05/16 | Published: 2010/05/16
Received: 2010/05/16 | Accepted: 2010/05/16 | Published: 2010/05/16
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