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Impact of Soil Amendments on Macronutrients Na, K, Ca, Mg, N and P) Contents of Rice Grain Under Subsurface Drainage in Salt Affected Soil

R. MANDAL
Benerpota Salinity Research Station, BWDB, Satkhira, Bangladesh

A C. AICH
Department of Soil, Water and Environment, University of Dhaka, Dhaka

Abstract/ Executive Summary:

Impact of soil amendments and brackish water irrigation on grain of three cultivars of rice provided with subsurface drained and non-drained conditions in saline soil was investigated . Contents of Na, Mg, N and P of rice grain increased significantly with increasing brackishness of irrigation water (ECiw 0.7 to 5.0 dS/m) irrespective of drainage condition. The content of Na was found much lower in grain provided with subsurface drainage as compared with non drained ones irrespective of treatments and varieties. However, a reverse trend was observed in case of K. Addition of both lime and gypsum alone caused a decrease in Na and an insignificant increase in Ca concentration at all levels of brackish water irrigation. Effect of lime and gypsum in presence of organic matter did not influence very much in Na, Ca and Mg concentrations in all the cultivars. The contents of N and P increased with increasing levels of salinity might be due to stunted growth of plant caused by excessive Na. Lime and gypsum alone caused a decline in the P content whereas organic matter alone helped to increase the same in grain of rice. Application of lime and gypsum along with organic matter failed to respond in P content significantly in grain of rice in all grades of brackish water whether provided with subsurface drainage or not . In both the sets, cow-dung influenced better performance than straw in mineral nutrition of rice grain

Keywords: Soil amendment, Rice grain, Macronutrients, Subsurface drainage, Salt affected soil

Location:

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To see whether the application of organic, inorganic and physical amendments could possibly suppress the uptake of Na and help to enhance the accumulation of other macronutrients of rice grain

Methodology:

The experiment was conducted in saline soil (ECe 13.5 dS/m; pH 5.8) at Magura of Satkhira district. The land was divided into four blocks, two for non-drainage and the other two for subsurface drainage. Brackish irrigation water (EC iw); Low (0.7 dS/m); medium ( 2.50 ds/m) and high (5.0 dS/m). Cow-dung (CD) and Straw (Str) : CD₀Str₀ = Organic Matter (0 t/ha), CD = (10 t/ha) and Str = (10 t/ha). Gypsum (G) and lime (L): G₀L₀ = (O t/ha), G = ( 0.5 t/ha) and L = ( 0.5 t/ha) Rice cultivars: BR3, BR15 and Iratom 24. A total of 81 treatment combinations were arranged according to 34 factorial split strip plot design with two replications. Each sub-block was separated by 2 meter buffer zone and each plot was surrounded by a 1m wide ridge. PK (80: 60 kg/ha) and one third of the N (90 kg/ha) was applied as basal dose and the rest two-third of N was top dressed in two equal splits one at 30 days after transplantation (DAT) and the rest at 60 DAT. Analytical techniques: Grain sample of rice was digested by diacid mixture of HNO₃ and HCIO₄ in 5 : 2 ratio following the method proposed by Yoshida et al. for chemical analysis of Ca, Mg, Na, K and P. Determinations were made of Ca and Mg by Atomic Absorption Spectrophotometer (model Hitachi 170-10), Na and K by Flame Emmission Spectrophotometery using a Flame Photometer (model corning EEL) and P as vanadomolybdophosporic acid complex spectrophotometrically. N in a separate portion of grain sample, digested by H₂S0₄ and HCIO₄ mixture, was estimated colorimetrically by Auto Analyzer (Technic S.O. colorimeter).

Source of Information: Dhaka Univ. J. Biol. Sci. 19( 1): 1-11, 2010 (January

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The content of N in grain increased significantly due to the application of gypsum and lime in all grades of irrigation waters, though a few data were not significant. Organic matter (cow-dung/straw) as found more potent when applied together with lime/gypsum and the increases were significant burring a few cases. The increase of N and P content due to brackishness had happened happened due to the stunted growth of the plant caused by excessive Na and possibly the uptake of N and P remained the same but the growth was not so much as in low brackish water.

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