Abstract
A pot experiment was carried out in the net house of Bangladesh Institute of Nuclear Agriculture (BINA) to study nutrient content and their uptake by different rice varieties (NERICA-1, NERICA-10 and BRRI dhan48) in response to different levels of arsenic (As) under varying moisture regimes. Three levels of As were added viz. 0, 30, 60 ppm to the pot soil from sodium arsenate (Na2HAsO4. 7H2O). After establishment of crops the moisture level of soil was adjusted to maintain flooded, 50% and 100% field capacity condition during crop growing period. The experiment was laid out in a Completely Randomized Design (CRD), with three replications. The amount of N, P, K, S and Zn was calculated as per their rate of application and was applied to the individual pot. Higher levels of As adversely affected the nutrient content and their uptake by rice except N contents. Nitrogen content increased with the increase of As level. Higher amount of nutrient content and uptake was recorded in BRRI dhan48 and flood condition enhanced higher nutrient content as well as uptake by rice. This study suggests the possible management of moisture regime and considering less As susceptible variety, which might reduce the toxic effects of As on nutrient uptake.J. Bangladesh Agril. Univ. 12(2): 291-296, December 2014
Highlights
Rice is the principal cereal crop in Bangladesh that plays the most important role in the national economy
Straight head resulted in sterile florets with distorted lemma and palea, reduced plant height, tillering, panicle length and grain yield
There were 27 treatments consisting of three doses of As (0, 30 and 60 ppm), three moisture regime (50% field capacity, 100% field capacity and flood condition) and three rice varieties (NERICA-1, NERICA-10 and BRRI dhan48)
Summary
Rice is the principal cereal crop in Bangladesh that plays the most important role in the national economy. Irrigation of agricultural land with As-contaminated water or groundwater, in Bangladesh, India and South-east Asia, can be accumulated As in both soils and plants, causing risks to soil ecosystems and human health (Martin et al, 1992; Xie & Huang, 1998; Meharg & Rahman, 2003). Straight head resulted in sterile florets with distorted lemma and palea, reduced plant height, tillering, panicle length and grain yield. Wang et al, (2006) reported that As (roxarsone or arsanilic acid) could significantly reduce plant height, number of effective tiller, straw yield and grain yield. Rice is the staple food in this country, any adverse effects on nutrient content of rice due to arsenic contaminated irrigation water would badly cause nutrient deficiency problem. This research attempted to reduce toxic effects of As on nutrient content in rice by using different variety and moisture regime
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