Studies on zinc nutrition of basmati rice (Oryza sativa)
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Date
2018
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Publisher
Punjab Agricultural University, Ludhiana
Abstract
The present investigation entitled “Studies on zinc nutrition of basmati rice (Oryza sativa)”
was carried out to evaluate effect of different doses of zinc on yield and yield attributes of
Basmati rice. A field experiment was conducted at two sites (Zn-deficient and Zn-sufficient)
at experimental farm of Regional Research Station, Gurdaspur, Punjab Agricultural
University, Ludhiana and another study at farmers’ fields in different villages of Gurdaspur
during Kharif 2016. The soil of the experimental farm was silt loam in texture, noncalcareous
and alkaline in reaction and the soil at farmers’ fields varied from loam to silt loam
in texture and alkaline in reaction. The treatments at two sites (Zn-deficient and Zn-sufficient)
comprised of two rice varieties as main plot and seven Zn treatments as sub-plots replicated
three times in a split-plot design. In Zn-deficient site (Site-I), a significant increase in grain
and straw yield was found with Zn application @ 12.5 kg Zn/ha (T4), 6.25 kg Zn/ha (T3) and
3.12 kg Zn/ha (T2) whereas in Zn sufficient site (Site-II) there was non-significant increase in
grain and straw yield with increasing Zn levels. Among the tested varieties, Pusa basmati
1121 recorded significantly higher grain yield in comparison to Punjab basmati 2 in Zn
deficient site (Site-I) and non-significant increase was found for varieties in Zn sufficient site
(Site-II). Yield attributes showed non-significant increase with increasing Zn levels at both
the sites except 1000-grain weight which increased significantly with increasing Zn levels in
deficient site. DTPA-Zn showed significant increase in Zn deficient site whereas it was nonsignificant
in Zn sufficient site. The Zn content in whole grain, brown rice and straw at both
the sites at experimental farm increased significantly with soil applied Zn treatments but
maximum Zn content was recorded in treatments which had soil plus foliar Zn application.
The amount of Zn extracted by using different extractants in soil samples collected at harvest
from different sites at farmers’ field was in the following order: AB-EDTA> Mehlich-3> ABDTPA>
DTPA-HCL> 0.1N HCL= DTPA with Zn extraction of 1.14, 0.95, 0.94, 0.73, 0.65
and 0.65 mg kg-1 and critical limit values using Cate & Nelson procedure for these were 0.87,
0.65, 0.69, 0.55, 0.64 and 0.59 mg kg-1, respectively. Different extractants were highly and
significantly correlated with each other indicating that they could extract zinc more or less
from soil. DTPA-Zn and AB-DTPA-Zn showed the highest correlation (0.966**) while ABDTPA-Zn
and DTPA+HCL showed the least (0.755**). Accordingly, DTPA-Zn and ABDTPA-Zn
extractant could be used effectively for estimating Zn for Basmati rice grown in
Gurdaspur district of Punjab.