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Effects of Nitrogen on Meld Attributes of High Yield Variety Aus Rice

M.T. ISLAM
School of Agriculture anzd Rural Development, Bangladesh Open University, Gazipur- 1704, Bangladesh.

R.K. BHOWMIC
Bangladesh Agricultural University (BAU)

M.S. ALI
Department ofAgricultura1 Chemistry, BAU

M.R. ISLAM
Bangladesh Agricultural Research Institute

Abstract/ Executive Summary:

Field experiments were conducted at the Bangladesh Agricultural University Farm to evaluate the effects of different nitrogenous fertilizers (urea, calcium nitrate and ammonium su1phate)on yield attributes of transplanted aus rice cv. BR3. The various nitrogenous fertilizers were applied Q60,70,80 and 100 kg Nlha with basal doses of P and KO 30 kg, P, OJha and 20 kgK, O/ha from TSP and MP, respectively. Nitrogen application, irrespective of sources and levels, significantly increased rice grain yield over the control. The highest grain and straw yield (4.63 and 7.80 tha) were obtained by urea @ 80 kg Nka. Application of nitrogen from various sources increased grain yield from 14 t0455h and straw yield from 19 to 73%. Amongst the various sources of nitrogen tested, urea O 80lrgNha appeared to be the best in respect of yield of rice followed by ammonium sulphate and calcium nitrate under conditions tested.

Keywords: Aus rice, Nitrogen source, Rice yield, Urea.

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Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer, Rice

Objectives:

The present investi- gation was undertaken to compare the efficiency of different carriers of nitrogcn on yield and yield attributes of transplanted aus rice (BR3).

Methodology:

The study was conducted from April to August 1994 on a non-calcareous dark grey flood plain silty loam soil in Sonatala Series at Bangladesh Agricultural University Farm using rice as a test crop. The soil had pH (1:25) 6.8, total N 0.10% available P l7ppm, exchangeable K 0.38 m.e /100g, available S 14ppm, organic carbon 0.8% and organic matter 1.38%. The study consisted of the following treatments. A Sources of nitrogen a) Urea (U) b) Calcium nitrate(CN) C) Ammonium sulphate (AS) B. Levels of nitrogen a) Control(No nitrogen) b) 60kg Nha C) 7OkgNlha d) 80kgNiha e) 100kg Nlha The experiment was carried out in a randomized block design (RBD) with three replications. The unit plot size was 5m x 2m. with BR3 (Biplob) a high-yielding variety of aus rice as the test crop in this study. The plots were fertilized with nitrogen 8 0,60,70,80 and 100kg Niha through urea (U), calcium nitrate (CN) and ammonium sulphate(AS). A basal dose of 30kg P,O, and 20kg 50 per hectare was also applied through triple superphosphate and muriate of potash, respectively. Total quantity of P, K and 1/3 of N were applied at the time of final land preparation. The rest of the N was applied in two equal doses after 20 and 45 days of transplanting, respectively. Rice seedlings (35 days old) were transplanted in the experimental plot @ 4 seedlings per hill with 25 cm x 10 cm spacing. Intercultural operations like irrigation, weeding, thinning etc. were done uniformly in all the treatments as and when necessary. The data of the crop characters were collected in respect of (i) plant height (ii) number of effective tillers per hill (iii) panicle length (iv) number of filled grains per panicle (v) 1000 grain weight (vi) grain (yield ha) and (vii) straw (yield/ha). The collected data were statistically analyzed and the means were adjudged by DMRT.

Source of Information: J. Natn. Sci. Coun. Sri Lanka 1997 25(2): 113-119

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Achievement/Findings:

The experimental findings show that a general increase in the yield contributing characters, grain and straw yield seems to be associated with the increased N availability upto 80 kg N/ha from applied sources. The possible reasons are that the experimental soil was having total nitrogen much below the critical value as well as low organic matter content. Out of the N sources, however, urea proved to be the most efficient as it results in upto 44.69% grain yield and 73.33% straw yield over control as compared to other sources. This may be attributed to the very high solubility of urea.

Knowledge Management: Journal