Effects of age of seedling and nitrogen rates in the nursery bed on growth, yield and yield components of BRII dhan52 under submerged condition

M Rafiqul Islam,Shompa Rani Debnath,Md Mahboob Karim,ABM Shafiul Alam,Md Sultan Uddin Bhuiya

doi:10.3329/ralf.v2i2.25009

Abstract

The experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during July to December 2013 in the aman season to investigate the effect of age of seedling and nitrogen rates in the nursery bed on growth, yield and yield components of BRRI dhan52. The experiment comprised of three ages of seedlings viz., 30, 35 and 40 day old and four nitrogen rate N1-N@50 kg ha-1, N2-N@75 kg ha-1, N3-N@100 kg ha-1, N4-N@125 kg ha-1. The experiment was laid out in a split plot design with three replications. Age of seedling showed significant differences for shoot weight, survivor, no. grains panicle-1, panicle length, grain yield and straw yield. The highest root weight (0.072 gm-2), plant height (108 cm), total tillers hill-1 (8.22), effective tillers hill-1 (7.03), non-effective tillers hill-1 (1.19), survivor (95.1%), grains panicle-1 (106.2), grain yield (5.57 t ha-1), straw yield (6.26 t ha-1) and harvest index (0.47%) were found by transplanting 40 day old seedlings. The highest shoot weight (0.53 gm-2), 1000 grain wt. (25.3g) was found by transplanting 35 day old seedlings and 30 day old seedlings produced highest sterile spikelets (28.9) and panicle length (23.8 cm). Nitrogen rate in the nursery showed significant differences for shoot weight, root weight, survivor, plant height, total tillers hill-1, effective tillers hill-1, non-effective tillers hill-1, panicle length, grains panicle-1, grain yield and straw yield. Application of 50 kg N ha-1 gave higher plant height (108 cm) and harvest index (0.47%). On the other hand, application of 75 kg N ha-1 produced highest noneffective tillers hill-1 (1.0), grains panicle-1 (100.7), 1000 grain weight (25.3 g) and harvest index (0.47%). Application of 100 kg N ha-1 gave highest total tillers hill-1 (7.85), effective tillers hill-1 (6.85), noneffective tillers hill-1 (1.0), survivor (90.5%) and grain yield (5.01 t ha-1). Application of 125 kg N ha-1 gave highest panicle length (23.75 cm), grains panicle-1 (100.7), noneffective tillers hill-1 (1.0) and sterile spikelets (30.1). Forty day old seedlings grown with 100 kg N ha-1 at nursery found to be better in respect of grain yield. The result of the experiment also showed that aged seedlings regenerated quickly after desubmerge of water.Res. Agric., Livest. Fish.2(2): 261-269, August 2015

Highlights

Submergence is one of the major constraints in rice production in Bangladesh
Panda et al (1991) and Tekrony and Egli (1991) reported higher productive tillers and yield per unit area after transplanting healthy and vigorous seedlings grown with application of adequate nitrogen at nursery bed which might be due to the decrease in mortality rate after transplanting in main field
The experiment was conducted at the Agronomy field laboratory, Bangladesh Agricultural University, Mymensingh during the period from July to December 2013 to see the effect of age of seedling and nitrogen rates in the nursery bed on growth, yield and yield components of BRRI dhan52

Summary

INTRODUCTION

Submergence is one of the major constraints in rice production in Bangladesh. More than half of the total rice area is considered to be submergence-prone during the kharif season. Through MABC, a number of new varieties have been developed by the introgression of the SUB1A gene into mega rice varieties and these new varieties can ensure rice production in flood-prone areas because of their tolerance to complete submergence (Ismail et al, 2013, Mackill et al, 2012 and Septiningsih et al, 2013). Using healthy and vigorous seedlings resulted due to sufficient nitrogenous fertilizers in the nursery produced more productive tillers and a higher grain yield, partly by better stress tolerance and decreased seedling mortality after transplanting (Raghavaiah et al; 1989). Panda et al (1991) and Tekrony and Egli (1991) reported higher productive tillers and yield per unit area after transplanting healthy and vigorous seedlings grown with application of adequate nitrogen at nursery bed which might be due to the decrease in mortality rate after transplanting in main field. In transplanted rice, seedling age is an important factor for better crop yield which varied among growers. To see the performance of different levels of nitrogen in raising seedlings in nursery and this effects in the main field after desubmergence of flood water

MATERIALS AND METHODS

RESULTS AND DISCUSSION

CONCLUSION