Sulfur and zinc interactions in lowland rice
1991
Shah, A.L. | De Datta, S.K. (Bangladesh Rice Research Inst., Joydepur, Gazipur (Bangladesh). Soil Chemistry Div.)
Zinc and sulfur deficiencies occur independently in different lowland rice (Oryza sativa L.) in soils but sometimes occur together at the same site. A field experiment was conducted on a S- and Zn- deficient soil at Bungallon in Pangasinan, Philippines, to study the effects of S and Zn fertilizers and their interactions on growth and yield of rice. Four S levels -- 0, 25, 50, and 100 kg S/ha -- and four Zn levels -- 0, 10, 20, and 40 kg Zn/ha -- were used as treatments. IR62, a moderately Zn- susceptible variety, was the test variety. Application of Zn at 10 kg Zn/ha was sufficient to correct Zn deficiency in rice although the highest grain yield was obtained with 40 kg Zn/ha. Modest S response was recorded with 25 kg S/ha application when 40 kg Zn/ha was applied together with S. In contrast, high S levels beyond 25 kg S/ha (50 and 100 kg/ha) decreased grain yield when it was applied with Zn. Plant S content increased with fertilizer application. Similarly, Zn content of rice plants increased when Zn was applied; the increase being most pronounced with 40 kg Zn/ha. Conversely, plant Zn content decreased slightly when high doses of S were applied. Sulfur and Zn uptake correlated positively and significantly with grain yield when it was applied with Zn.
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