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Effect of Level of Nitrogen and Date of Transplanting on the Yield and Yield Attributes of Transplant Aman Rice Under Sri Method

M.A. Salath
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202

Forhad Ali
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202

M.P. Anwar
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202

M.S.U. Bhuiya
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202

Abstract/ Executive Summary:

An experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during the period from July to December 2003. The experiment consisted of two factors, four levels of nitrogen viz., (i) control (0 kg nitrogen ha-1), (ii) 40 kg nitrogen ha-1 (50% of the BRRI recommended dose), (iii) 80 kg nitrogen ha-1 (100% of the BRRI recommended dose) and (iv) 120 kg nitrogen ha-1 (150% of the BRRI recommended dose) and four dates of transplanting viz., (i) 15 July, (ii) 30 July, (iii) 14 August and (iv) 29 August 2003. Nitrogen level had a significant effect on plant height, total tillers hill-1 and grain yield. The highest grain yield was recorded from the application of 80 kg nitrogen ha-1(100% of the recommended dose). Date of transplanting had significant effect on all the yield and yield contributing characters of rice except straw yield and harvest index. The highest grain yield was recorded from 30 July transplanting. Eighty-kg nitrogen coupled with 30 July transplanting produced the highest grain yield of transplant aman rice cv. BRRI dhan31.

Keywords: Nitrogen level, Date of transplanting, SRI method

Location: Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh

Start Date: 00-07-2003

End Date: 00-12-2003

Program Area: Crop-Soil-Water Management

Commodity: Rice, SRI method, Nitrogen, Aman rice

Objectives:

In, general, late transplanting always reduces yields irrespective of cultivars (BRRI, 1992). It is required to know the optimum time of transplanting for good performance. Therefore, the satisfactory yield of rice cultivars might be obtained through an appropriate combination of date of transplanting and level of nitrogen. The present study was, therefore, undertaken to determine the optimum level of nitrogen and date of transplanting for the cultivation of Aman rice.

Methodology:

An experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during the period from July to December 2003. The soil belongs to Sonatola series of dark-grey floodplain soil type (AEZ-9). The texture is silt loam having non-calcareous soil with pH 6.7. The soil is low in organic matter content and its general fertility level is low (UNDP and FAO, 1988). The study consisted of two factors, four levels of nitrogen viz., (i) control (0 kg nitrogen ha-1), (ii) 40 kg nitrogen ha' (50% of the BRRI recommended dose), (iii) 80 kg nitrogen ha-1 (100% of the BRRI recommended dose) and (iv) 120 kg nitrogen ha-1 (150% of the BRRI recommended dose) and four dates of transplanting viz., (i) 15 July, (ii) 30 July, (iii) 14 August and (iv) 29 August 2003. The experiment was laid out in a randomized complete block design (RCBD) with three replications. The size of unit plot was 4 m X 2.5 m and the number of total plots was 48. Healthy seeds of BRRI dhan31 selected by specific gravity method were used as planting material. Selected seeds were then soaked in water in bucket for 24 hours. After keeping thickly in gunny bags seeds started sprouting after 48 hours, and were sown after 72 hours. A piece of high land was selected and puddled with country plough, cleaned and leveled with ladder. Then the sprouted seeds were sown in the nursery beds on 1 July, 15 July, 30 July and 14 August, 2003. Seedlings were taken proper care of at the time of raising. Weeds were removed and irrigation was given in the seedling nursery as and when necessary. The main land was first opened with a power tiller. The land was then puddled thoroughly by ploughing and cross ploughing with a country plough and subsequently leveled by laddering. The field lay out was made on 13 July according to experimental specification immediately after final land preparation. Individual plots were cleared of weeds and stubble and finally leveled by a wooden plank. The land was thus ready for transplanting of rice seedlings. The experimental plots were fertilized with urea, triple super phosphate (TSP), muriate of potash (MP), gypsum and zinc sulphate. The urea was applied according to the experimental treatments. The rates of other fertilizers were 100 kg TSP, 70 kg MP, 60 kg gypsum and 10 kg zinc sulphate ha-1. Except urea all the fertilizers were applied before final land preparation. Urea was applied in three equal splits at 15, 30 and 50 days after transplanting (DAT). Fifteen-day-old seedlings were uprooted from the nursery bed carefully. Uprooting was done carefully so that the seeds remained attached to the seedlings. Seedlings were transplanted according to the experimental treatment viz., on 15 July, 30 July, 14 August and 29 August 2003 in the plots. One seedling was transplanted in each hill maintaining a spacing of 30 cm x 30 cm. The seedlings were transplanted within 30 minutes after uprooting. The roots of the seedlings were kept on the surface of the soil. Seedlings in some hills died, and these were replaced by seedlings from the same source. The first weeding was done at 15 DAT. Before panicle initiation five weeding was done by hand pulling. Due to lack of natural rain during crop growth Period irrigation was done weekly. When water stagnancy occurred due to heavy rainfall, drainage was maintained to avoid it. A few yellow stem borers were noticed in the second week of October which was controlled by using Dimecron 100 EC @ 1.51 ha-1. Individual plots were harvested at maturity at different dates ranging from 18 November to 10 December 2002. The crops were then separately threshed, their straws and grains were sun-dried and weights were recorded. Yield was adjusted to 14% moisture content and recorded into t ha' basis. Data pertaining to yield and yield attributes were taken from randomly selected hills (10 hills plot-1) harvested and collected from each plot. Data were collected on plant height, total tillers hill-1, number of effective tillers hill-1, panicle length, number of grains panicle', number of sterile spikelets panicle-1, 1000-grain weight, grain yield, straw yield and harvest index. Collected data were compiled and tabulated in proper form and were subjected to statistical analysis. Analysis of variance was done following the computer package MSTAT. The mean differences among the treatments were adjudged by Duncan's Multiple New Range Test (Gomez and Gomez, 1984).

Source of Information: J. Bangladesh Agril. Univ. 2(1): 31-36, 2004 ISSN 1810-3030

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Achievement/Findings:

The highest grain yield was recorded from the application of 80 kg nitrogen ha-1(100% of the recommended dose). Date of transplanting had a significant effect on all the yield and yield contributing characters of rice except straw yield and harvest index. The highest grain yield was recorded from 30 July transplanting. Eighty-kg nitrogen coupled with 30 July transplanting produced the highest grain yield of transplant Aman rice cv. BRRI dhan31.

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