Effect Of Phosphorus In Commercial Fertilizers
On Phytoavailability Cadmium And Zinc Uptake
By Sugarcane
Author(s)
P. Sampanpanish, S. Ruangkhum & C. Tongcumpou
Abstract
The effects of phosphorus in commercial fertilizers on concentrations of total
cadmium (Cd) and zinc (Zn), plant-available Cd and Zn and sugarcane uptake of
Cd and Zn were studied. A single rate (312.5 kg/ ha) of 16-16-8 NPK fertilizer
was applied on three levels (0-3, 3-20 and >20 mg) of Cd contaminated
sugarcane cultivated field in Mae Sot district, Tak province. In order to
investigate the effects of different rates of fertilizer application, 16-16-8 NPK
fertilizer at the rate of 312.5, 625 and 1,250 kg fertilizer/ ha was applied to soils
in a pot experiment and planted with a piece of mature cane stem. The pot
experiment was conducted in a randomized block design with three replications.
Repeat applications of fertilizer were made at the same rate in the fifth month of
the cultivation for both field and pot experiments. Soil and sugarcane samples
were collected at the end of the second and the sixth month respectively. After
harvesting, sugarcanes were divided into five components: underground stems,
roots, bagasses, juice and leaves. Chemical analysis of the field experiments
showed that total Cd and Zn in sugarcane increased with Cd concentration in
cultivated field and found that Cd and Zn mostly accumulated in roots. Longterm
effects of fertilizer application was expected to be a concern although there
was no higher Cd and Zn concentrations in soil after repeat fertilization in the
fifth month of the cultivation. For the pot experiment, the results showed that
higher P can make more Cd available and ease take up and accumulation in
different parts of the sugarcane. Moderate P application rate reduced
phytoavailability of Zn at the end of the second month because of the P-Zn
mineral precipitation. However, the ability of sugarcane to uptake Zn increased
again at the end of the sixth month of the cultivation at which time total P in the
soil decreased. Total Cd and Zn in sugarcane were significantly increased with
increasing 16-16-8 NPK fertilizer application rates and we found that Cd and Zn
accumulated in sugarcane according to the following sequence: roots>
underground stems (setts)> bagasses> leaves> juice.
Keywords: phosphorus, fertilizers, cadmium, zinc, phytoavailability, sugarcane.
Keywords
phosphorus, fertilizers, cadmium, zinc, phytoavailability, sugarcane.
Related Book
Other papers in this volume
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