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Sulphur and Zinc Interactions in Relation to Nutrient Concentrations and Yields of Wheat, Rice and Mungbean.

M. N. Islam
Department of Soil Science, Sher-e-Bangia Agricultural University, Sher-e- e-Bangla Nagar, Dhaka-1207

S. Hoque
Professor
Department of Soil, Water and Environment, University of Dhaka, Bangladesh

A. Islam
Vice-Chancellor, Daffodil lnternational University, Dhanmondi, Dhaka.

Abstract/ Executive Summary:

Field experiments were carried out with wheat (Triticum aestivum L.), rice (Oryza sativa L.) and mungbean (Vigna radata L.) to study the effects of S x Zn interactions using three rates of S (0, 20 and 40 kg S ha^-1 for wheat and nee and 0, 10 and 20 kg S ha^-1 for mungbean) and three rates of Zn (0, 5 and 10 kg Zn ha^-1 for wheat and rice and 0, 3 and 6 kg Zn ha^-1 for mungbean). The concentrations of Zn showed increase with increasing doses of Zn and decreased with increasing doses of S in wheat, rice and mungbean plants. S x Zn interactions were antagonistic to both Sand Zn concentrations in wheat and rice plants and to Zn concentration in mungbean plant particularly when S and Zn were applied at lug her combinations. S x Zn interactions showed antagonism to S uptake by rice plant and to Zn uptake by wheat plant. The yields of wheat, rice and mungbean crops were not affected due to S x Zn interactions (absence of interaction). Application of 20 kg S with 5 kg Zn ha^-1 was the most suitable combination for the production of rice.

Keywords: Sulphur, Zinc, Wheat, Rice, Mungbean

Location: Sher-e-Bangia Agricultural University Farm, Dhaka, Bangladesh.

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Soil fertility, Rice, Mungbean, Wheat

Objectives:

To evaluate the effect of S x Zn interaction on the concentrations and uptake of S and Zn in plants and on the yields of wheat, rice and mungbean crops under the existing soil and climatic conditions of Bangladesh.

Methodology:

Three field experiments were carried out at the Sher-e-Bangia Agricultural University Farm , Dhaka. Composite soil samples, collected from the fields to a depth of 0-15 cm were air dried, ground and passed through 2 mm sieve for physical and chemical analyses. The soils used for the cultivation of wheat, rice and mungbean were clay loam in texture. The soil used for wheat had pH 6.0, organic carbon 0.51 %, CEC 9.7 Cmol kg^-1, available S 7.0 µg g^-1 and available Zn 1.25 µg g^-1 soil. The soil used for rice had pH 6.2, organic carbon 0.56%, CEC 10.1 Cmol kg^-1, available S 7.6 µg g^-1 and available Zn 1.31 µg g^-1 soil. The treatments consisted of 3 rates of S (0, 20 and 40 kg S ha-1 for wheat and rice and 0, 10 and 20 kg S ha^-1 for mungbean from Gypsum) and 3 rates of Zn (0, 5 and I0 Zn ha^-1 for wheat and rice and 0, 3 and 6 kg Zn ha^-1 for mungbean from ZnO). The rates of S and Zn are designated in the text as S₀, S₁ , S₂ and Zn₀, Zn₁ , Zn₂ , respectively. A basal dose of nitrogen (100 kg N ha^-1 from urea applied in two splits for wheat and in three splits for rice and 20 kg N ha^-1 all at a time for mungbean), phosphorus (40 kg P₂ 0₅ ha^-1 for each crop from TSP) and potassium (60 kg K₂ 0 ha^-1 from muriate of potash for wheat and rice and 40 kg K₂ 0 ha^-1 for mungbean) were applied in each individual plot of 4m x 3m for wheat and rice and 4m x 2.5m for mungbean. The calculated and required amounts of S and Zn fertilizers and the total basal amounts of potassium and phosphorus fertilizers for each crop were applied at the time of final land preparation. Wheat (Kanchan) in rabi season, rice (BR-3) in aus season (kharif^-1) and mungbean (Kanti) in kharif^-1season in 1999 were cultivated following their recommended spacing. A total of 27 plots for each crop (9 treatments x 3 replications) were laid out in Randomized Block Design. Plant samples from each individual plot were collected at three different growth stages of the crops for chemical analyses. The crops were harvested at their ripening stages and both the grain and straw yields of wheat and rice and only the grain yield of mungbean were recorded. It was not possible to record the shoot yield data of mungbean due to untimely rainfall just after harvesting the pods, which resulted the fall of the leaves. The collected plant samples were processed, oven-dried and digested with HN0₃ : HC10₄ (2: I) mixture. Sulphur and zinc contents in the digests and in the soil extracts were determined by turbidimetric method and Atomic Absorption Spectrophotometer, respectively.

Source of Information: Bangladesh 1. Soil Sci. 30( 1-2): 1-7, 2004, ISSN 0253-5440

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The individual rates of S and S x Zn interactions showed significant changes on the grain yield of mungbean. It was evident from the results that the grain yield of mungbean was not affected due to S x Zn interactions (i.e., absence of interactions). The concentrations of Zn showed increase with increasing doses of Zn and decreased with increasing doses of S in wheat, rice and mungbean plants. S x Zn interactions were antagonistic to both Sand Zn concentrations in wheat and rice plants and to Zn concentration in mungbean plant particularly when S and Zn were applied at lug her combinations. S x Zn interactions showed antagonism to S uptake by rice plant and to Zn uptake by wheat plant. The yields of wheat, rice and mungbean crops were not affected due to S x Zn interactions (absence of interaction). Application of 20 kg S with 5 kg Zn ha^-1 was the most suitable combination for the production of rice.

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