Yield Of Transplant Aman Rice Research Articles

Growth and Yield of Transplant Aman Rice (BRRI dhan38) as Affected by Weeding and Zinc Level

Growth and Yield of Transplant Aman Rice (BRRI dhan38) as Affected by Weeding and Zinc Level

Integrated Nitrogen Management on Weed Growth and Yield Performance of Transplant Aman Rice

Rice requires nitrogen in larger quantities than any other nutrient, and it is the most critical limiting factor that influences grain yield. But inappropriate sources and management of nitrogen is considered to be the most critical one among the various reasons of low rice productivity. In order to address the problem, an experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh, during June to October 2020 to determine the effect of integrated nitrogen management (INM) on weed growth and yield of transplant aman rice. The experiment comprised five aman rice varieties, viz. Binadhan-7 (V1), BRRI dhan56 (V2), BRRI dhan66 (V3), BRRI dhan71 (V4) and BRRI dhan75 (V5) and four nitrogen management approaches: control (no nitrogen) (N0), 100% of recommended dose (RD) of nitrogenous fertilizer as prilled urea (150 kg ha-1) (N1), 2.5 t ha-1 poultry manure + 75% of RD of nitrogenous fertilizer as prilled urea (112.5 kg ha-1) (N2) and application of USG (1.8 g per 4 hills) (N3). Results reveal that maximum weed density and dry weight were found in BRRI dhan56 whereas minimum ones were observed in BRRI dhan66. In case of INM, application of 100% of RD of nitrogenous fertilizer as prilled urea showed maximum weed density and dry weight but minimum ones were found with application of USG. In combine, weed density and dry weight were found highest in BRRI dhan56 with 100% of RD of urea and the lowest weed density was found in BRRI dhan66 with no nitrogen treatment at 20 DAT and in BRRI dhan66 with application of USG at 35 DAT and lowest weed dry weight was obtained from Binadhan-7 with application of USG (1.8 g per 4 hills) at 20 and 35 DAT. Variety Binadhan-7 showed superior performance in terms of yield and yield attributes. Application of USG showed the highest number of grains panicle-1 and grain yield. Interaction of Binadhan-7 with application of USG produced highest number of grains panicle-1 (116.60), highest grain yield (5.21 t ha-1), biological yield (10.94 t ha-1), harvest index (47.65%) and highest BCR (1.57). So, results indicated that Binadhan-7 with application of USG (1.8 g per 4 hills) might be recommended for obtaining highest grain yield with higher nitrogen use efficiency, highest BCR as well as to control weed more effectively in aman season.

Effect of variety and nitrogen fertilizer managements on the growth and yield of Transplant aman rice managements

Varietal selection and appropriate placement of nitrogen fertilizer could reduce the magnitude of nitrogen losses to a considerable extent and improve its use efficiency for better grain production. An experiment was carried out during the period from July to December at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh to evaluate the effect of variety and nitrogen fertilizer management on the growth and yield of transplant aman rice. The treatments consisted of three varieties viz. BR11, BRRI dhan49 and Binadhan-7, and five nitrogen fertilizer managements viz. two depth of placement of USG (Urea Super Granule) and three split applications of prilled urea. The experiment was laid out in a randomized complete block design with three replications. The results showed that the effect of variety and nitrogen fertilizer management significantly influenced all the yield contributing characters except weight of 1000- grains, non-effective tillers hill-1 and panicle length. The highest grain yield (3.69 t ha-1) was obtained from Binadhan-7. In the case of nitrogen fertilizer management, the highest grain yield (4.32 t ha-1) was found from the 6 cm depth placement of USG. The highest grain yield (4.82 t ha- 1) was observed from the interaction of Binadhan-7 with the 6 cm depth of placement of USG. It may be concluded that Binadhan-7 with 6 cm depth of placement of USG appeared as the promising practice to maximize the yield of transplant aman rice.
 Res. Agric., Livest. Fish.8(3): 281-289, December 2021

Yield Enhancement of T. Aman Rice in Salinity Affected Area of Noakhali District of Bangladesh Through Adoption of Variety and Gypsum Fertilizer Application

An experiment was conducted in the farmer’s field at the Moddho Jutkhali village, Subornochar, Noakhali, a salinity affected area of Bangladesh to investigate the effect of variety and gypsum fertilizer on the yield of transplant aman rice under salinity condition during July to December, 2017. The experiment was laid out in a two factor split-plot design with three replications consisting of three aman rice varieties viz., Swarna (V1, an indian variety adapted to that locality), BRRI dhan52 (V2) and Binadhan-7 (V3) and three levels of gypsum fertilizer viz., 0, 75 and 150 kg gypsum ha-1. Yield components and yield of transplant aman rice were significantly influenced by variety, level of gypsum and their interactions. Among the varieties, Swarna produced the tallest plant height (126.7 cm), highest number of grains panicle-1 (76.30), weight of 1000 grains (25.80 g), grain yield (5.44 t ha-1), straw yield (7.07 t ha-1), and biological yield (12.51 t ha-1) while Binadhan-7 showed lowest values of these respective parameters but number of total tillers hill-1 (9.99) and number of effective tillers hill-1 (8.94) were maximum in Binadhan-7. Among three gypsum levels, most of the yield contributing characters showed highest values for 150 kg gypsum ha-1 that’s why grain yield was also highest (5.32 t ha-1) for this treatment. On the other hand lowest grain yield (4.92 t ha-1) was found when no gypsum was applied. In case of treatment interaction, highest number of grains panicle-1 (80.23) and highest grain yield (5.69 t ha-1) were produced when Swarna was cultivated with 75 kg gypsum ha-1 while lowest values of grain, straw and biological yields (4.36, 5.11 and 9.47 t ha-1, respectively) were found when Binadhan-7 was cultivated without applying any gypsum. Therefore, it can be concluded that the variety Swarna with 75 kg gypsum ha-1 can be practiced for the cultivation of transplant aman rice in the salinity affected area of Noakhali, Bangladesh to obtain the highest grain yield.
 Res. Agric., Livest. Fish.7(3): 363-371, December 2020

Effects of barley crop residues on weed management and grain yield of transplant Aman rice

The experiment was conducted at the Agronomy Field Laboratory of Bangladesh Agricultural University during the period from July to December 2017 to evaluate the effect of barley crop residues on weed management and yield of transplant aman rice. The experiment consisted of three time of crop residue application viz. one week before transplanting, at the time of transplanting, at one week after transplanting and five doses of barley crop residues such as no crop residues, barley crop residues @ 0.5 t ha-1, barley crop residues @ 1.0 t ha-1, barley crop residues @ 1.5 t ha-1, and barley crop residues @ 2.0 t ha-1. The experiment was laid out in a split plot design with three replications. Weed population and weed dry weight were significantly affected by the dose and time of barley crop residues application. The minimum weed growth was noticed with the application of barley crop residues @ 2.0 t ha-1 at one week after transplanting and the maximum one was observed in no crop residues treatment at one week before transplanting. The highest values of percent weed inhibition was found with the application of barley crop residues @ 2.0 t ha-1 which were 48.13%, 41.39%, 39.71%, 39.88% and 38.73% for panikachu (Monochoria vaginalis), shama (Echinochloa crusgalli), chesra (Scirpus juncoides), amrul (Oxalis corniculata) and sabujnakful (Cyperus difformis), respectively. Rice grain yield and the yield contributing characters produced by the application of crop residues at one week before transplanting was the highest among different times of application and the highest reduction of rice grain yield was obtained in no crop residue treatment. The highest number of effective tillers hill-1, number of grains panicle-1, 1000-grain weight, rice grain and straw yields were observed when barley crop residues were applied @ 2.0 t ha-1 at one week before transplanting. Results of this study indicate that application of barley crop residues @ 2 t ha-1 at one week before transplanting showed the maximum suppression of weed growth. Therefore, barley crop residues might be used as an alternative tool for weed management in transplant aman rice.
 Progressive Agriculture 31 (2): 119-129, 2020

EFFICACY OF VARIETY AND MUSTARD CROP RESIDUES ON WEED MANAGEMENT AND CROP PERFORMANCE OF TRANSPLANT AMAN RICE

Weed infestation in rice field is always subject to agro ecological condition and growing seasons. Weeds cause major yield losses in crops and also reduce their quality. An experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh to investigate the efficacy of mustard crop residues on weed management and crop performance of transplant aman rice. The experiment consisted of three cultivars and five different levels of mustard crop residues. The experiment was laid out in a randomized complete block design with three replications. Weed population, weed dry weight and percent inhibition of weed were significantly influenced by mustard crop residues and cultivar. The maximum weed growth was noticed with the cultivar BRRI dhan34 and the minimum was found in the cultivar BRRI dhan49. The grain yield and other yield contributing characters produced by BRRI dhan49 was the highest among the studied varieties. The highest percent inhibition of 73.36, 78.82, 71.90, 76.83 and 81.53 found in Pani kachu, Chechra, Pani shapla, Shama and Sabuj nakful, respectively with the application of mustard crop residues at 3.0 t ha-1 + one hand weeding. It can be concluded that BRRI dhan49 and mustard crop residues showed potentiality to inhibit weed growth and it has a significant effect on the yield of transplant aman rice. Therefore, mustard crop residues could be recommended to use as an alternative tool for weed management.

Weed management and crop performance of rice as influenced by different crop residues

To investigate the effect of different plant residues on weed inhibition and yield of transplant aman rice, an experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during June 2017 to December, 2017. The experiment comprised of three rice cultivars i.e. BR11, BRRI dhan34 and BRRI dhan49 and five different plant residues treatment viz., no crop residues (control), soybean, wheat, bishkatali and sorghum crop residues @ 2.0 t ha-1 of each. The experiment was laid out following randomized complete block design with three replications. Weed population and weed dry weight were significantly affected by cultivars and crop residues treatment. The highest percent inhibition of 58.31%, 46.84%, 66.85%, 66.94% and 57.6% was in Panikachu (Monochoria vaginalis), Shama (Echinochloa crusgalli), Chesra (Scirpus juncoides), Sabujnakful (Cyperus difformis) and Amrul (Oxalis corniculata), respectively caused by sorghum crop residues. The grain yield, as well as the yield contributing characters produced by BR11,was the highest among the studied varieties. The highest number of effective tillers hill-1 (8.41), number of grains panicle-1(118.08) and 1000-grain weight (20.54 g) were observed in sorghum crop residues. BR11 under sorghum crop residues @ 2.0 t ha-1 produced the highest grain (5.76 t ha-1) and straw yield (6.39 t ha-1). So, to reduce herbicide use in the present situation of Bangladesh, natural herbicide or crop residues like sorghum might be used as an alternative way for weed management for effective and sustainable rice production.

INFLUENCE OF WEEDING REGIME AND INTEGRATED NUTRIENT MANAGEMENT ON THE YIELD PERFORMANCE OF TRANSPLANT AMAN RICE (CV. BRRI DHAN49)

The purpose of this experiment is to study the combined effect of frequency of weeding and integrated nutrient management on the growth and yield of transplant aman rice (cv. BRRI dhan49). The experiment consisted of five weeding regimes and four integrated nutrient managements. The experiment was laid out in a randomized complete block design with three replications. The highest grain yield (5.80 t ha-1) was obtained from the interaction between weed free and 25% BRRI RD + 75% N from CD which was followed by the applications of pre-emergence herbicide + one hand weeding at 35 DAT and 25% BRRI RD + 75% N from CD treatment. The lowest grain (3.65 t ha-1) was found from the interaction between no weeding and BRRI recommended chemical fertilizers.The degree of statistical relationship between grain yield and number of effective tillers/hill, grain yield and straw yield of BRRI dhan49 exhibited positive relationship. From the results of the study it can be concluded that the application of 25% BRRI RD + 75% N from CD in weed free condition might be used for obtaining the best performance of BRRI dhan49.

Allelopathic potential of marshpepper residues for weed management and yield of transplant Aman rice

An experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh, during the period from June to December 2016 to evaluate the effect of marshpepper (Polygonum hydropiper L.) crop residues on weed management and crop performance of transplant aman rice. The experiment consisted of three cultivars viz. BR11, BRRI dhan33 and BRRI dhan49 and five marshpepper crop residues treatment such as 0, 1.0, 2.0, 3.0 ton ha-1 and hand weeding. The experiment was laid out in a randomized complete block design (RCBD) with three replications. Five weed species belonging to four families infested the experimental plots. Weed population and weed dry weight were significantly affected by cultivar and crop residues treatment. The highest percent inhibition of all the studied weed was found by hand weeding. The second highest percent weed inhibition was found with the application of marshpepper residues at 3.0 t ha-1 which was 63.43, 63.43, 52.85, 52.40 and 59.12 percent for sabuj nakful (Cyperus difformis), chesra (Scirpus juncoides), shama (Echinochloa crusgalli) panikachu (Monochoria vaginalis) and panishapla (Nymphaea nouchali ) respectively. The maximum weed growth was noticed with the cultivar BRRI dhan33 variety and the minimum was found in the cultivar BRRI dhan49. The grain yield as well as the yield contributing characters produced by BRRI dhan49 was the highest among the studied varieties. The highest reduction of grain yield was obtained in no crop residue treatment. The highest number of effective tillers hill-1, number of grains panicle-1, 1000-grain weight, grain and straw yields were observed in marshpepper residues in hand weeding followed by 3.0 t ha-1 marshpepper crop residue. BRRI dhan49 produced the highest grain and straw yields under hand weeding followed by marshpepper residues 3.0 t ha-1 treatment. Results of this study indicate that marshpepper residues showed potentiality to inhibit weed growth and it has a significant effect on the yield of transplant aman rice. Therefore, marshpepper residues might be used as an alternative way for weed management effective and sustainable crop production.
 Progressive Agriculture 30 (4): 379-386, 2019

Effect of age of Seedlings at Staggered Planting and Spacing on Growth and Yield of Transplant Aman Rice (cv. BRRI dhan 46)

Effect of age of Seedlings at Staggered Planting and Spacing on Growth and Yield of Transplant Aman Rice (cv. BRRI dhan 46)

Effect of Age of Seedlings at Staggered Planting and Spacing on Growth and Yield of Transplant Aman Rice (Cv. Brri Dhan 46)

Effect of Age of Seedlings at Staggered Planting and Spacing on Growth and Yield of Transplant Aman Rice (Cv. Brri Dhan 46)

Effect of nitrogen fertilizer and weed management on the yield of transplant aman rice

The research work was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during aman season from July to December 2015 to study the effect of nitrogen fertilizer and weed management on the growth and yield of transplant aman rice cv. BRRI dhan46. The experiment consisted of four fertilizer treatments viz. 0 kg N ha−1 (N0), 40 kg N ha−1(N1), 80 kg N ha−1(N2) and 120 kg N ha−1(N3) and four weeding treatments viz. one hand weeding at 20 DAT (W1), two hand weedings at 20 and 35 DAT (W2), three hand weedings at 20, 35 and 50 DAT (W3), weeding by Japanese rice weeder twice at 20 and 35 DAT (W4) and unweeded control (W5). The experiment was laid out in the randomized complete block design with three replications. The highest plant height (113.00 cm), number of total tillers hill−1 (8.74), number of effective tillers hill−1 (6.18), panicle length (21.98 cm), number of grains panicle−1 (114.20), grain yield (4.00 t ha−1), straw yield (5.25 t ha−1) and biological yield (9.25 t ha−1) were recorded in N2 (80 kg N ha−1) treatment. The lowest plant height (106.00 cm), number of total tillers hill-1 (7.20), number of effective tillers hill−1 (5.00), panicle length (20.70 cm), number of grains panicle−1 (97.60), grain yield (3.52 t ha−1), straw yield (4.46 t ha−1) and biological yield (7.97 t ha−1) were recorded from N0 (No nitrogen fertilizer control) treatment. On the other hand, the highest grain yield 4.23 t ha−1 was observed in three weedings condition because of the highest number of effective tillers hill−1 (6.81), number of grains panicle−1(111.10). The highest straw yield (5.51 t ha−1) was also found in three weeding condition. The lowest grain yield (3.40 t ha−1) was recorded in W5 (unweeded control) treatment. The lowest straw yield (4.31 t ha−1) was also observed in W5 (unweeded control) treatment because of the smallest plant (106.97 cm) and lower number of total tillers hill−1 (7.20). Therefore, 80 kg N ha−1along with three hand weedings at 20, 35 and 50 DAT may be used for obtaining the highest grain and straw yields of BRRI dhan46J. Bangladesh Agril. Univ. 16(1): 12-16, April 2018

Effect of Nitrogen Sources and Weed Management Options on Weed Growth and Crop Yield of Transplant Aman Rice

A field study was conducted at the Agronomy research field of Bangladesh Agricultural University, Mymensingh, during the period of July to December, 2013 to evaluate the sources of nitrogen and weed management options on weed growth and rice yield. The experiment included four nitrogen sources (100% cowdung, 100% prilled urea, 100% urea super granule, 50% cowdung + 50% prilled urea) and four weed management options (weedy, application of herbicide at 3 DAT, application of herbicide at 3 DAT followed by hand weeding at 21 DAT and weed free). Sources of nitrogen and weed management options had significant effect on tiller number, biomass, SPAD value, panicle number, number of florets panicle-1, grain and straw yield, and weed biomass. The highest grain yield (5.40 t ha-1) was found in the treatment of 50% cowdung + 50% prilled urea with combination of season long weed free. Although 100% prilled urea had significantly similar grain yield to 50% cowdung + 50% prilled urea, however, across the weed management options, 100% urea super granule and 100% cowdung had 15 and 27% lower grain yield. Irrespective of the weed management options, 100% prilled urea had always higher weed biomass and 100% USG, 50% cowdung + 50% prilled urea, and 100% cowdung had 46, 35 and 19% lower weed biomass, respectively, compared with 100% prilled urea. In terms of rice yield and weed management, combined application of organic and inorganic source of nitrogen is better than only chemical or only organic source and pre-emergence herbicide followed by one hand weeding for transplanted aman rice.Bangladesh Agron. J. 2017, 20(1): 85-97

Effect of age of seedlings at staggered planting and nitrogen rate on the growth and yield of transplant Aman rice

An experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during July to December 2015 to find out the effect of age of seedlings at staggered planting and nitrogen rate on the growth and yield of transplant Aman rice (cv. BRRI dhan46). The experiment comprised three ages of seedlings viz. 30, 45 and 60-day old and six nitrogen rate viz. 0, 40, 60, 80, 100 and 120k kg N ha–1. The experiment was laid out in a Randomized Complete Block Design with three replications. The effect of age of seedlings and nitrogen rates and their interaction were significant on yield and yield contributing characters of transplant Aman rice. The highest plant height, total dry matter production hill–1 and leaf area index were recorded in 30-day old seedlings with 80 kg N ha–1. Grain yield gradually increased with the use of relatively younger seedlings and 30-day old seedlings produced the highest number of effective tillers hill–1 (5.34), grains panicle–1 (110.9), 1000-grain weight (24.60 g), grain yield (4.06 t ha–1) and straw yield (5.17 t ha–1). In case of nitrogen rate, 80 kg N ha–1 produce the highest grains panicle–1 (113.1), 1000-grain weight (25.39 g), grain yield (4.37 t ha–1) and straw yield (5.59 t ha–1). In interaction, 30-day old seedlings with 80 kg N ha–1 produced the highest effective tillers hill–1 (6.22), grains panicle–1 (124.1), 1000-grain weight (26.91g), grain yield (4.71 t ha–1) and straw yield (6.16 t ha–1). Therefore, 30-day old seedlings with 80 kg N ha–1 appeared as the promising technique to obtain the highest grain yield. It was also observed that under adverse situation delaying in transplanting may be continued up to 15 September with aged seedlings (60-day old) from the same source and application of nitrogen ranging from 100–120 kg ha–1 to obtain grain yield ranging from 3.8–4.0 t ha–1.J. Bangladesh Agril. Univ. 15(1): 21-25, January 2017

Yield performance of some transplant aman rice varieties as influenced by different levels of nitrogen

The experiment was carried out during the period of June to November 2013 at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh with a view to examine the yield performance of some transplant aman rice varieties as influenced by different levels of nitrogen. The experiment consisted of four varieties viz. BRRI dhan49, BRRI dhan52, BRRI dhan56, BRRI dhan57 and four levels of N viz. 0, 46, 60 and 75 kg ha-1. The experiment was laid out in a randomized complete block design with three replications. Variety, levels of N and their interactions exerted significant influence on yield contributing characters and yield of transplant aman rice. Among the varieties, BRRI dhan52 produced the tallest plant (117.20 cm), highest number of effective tillers hill-1 (11.28), grains panicle-1 (121.5) and 1000-grain weight (23.65 g) whereas the lowest values of these parameters were produced by BRRI dhan57. Highest grain yield (5.69 t ha-1) was obtained from BRRI dhan52 followed by BRRI dhan49 (5.15 t ha-1) and the lowest one (4.25 t ha-1) was obtained from BRRI dhan57. In case of N, the tallest plant (111.70 cm), highest number of total tillers hill-1 (12.34), grains panicle-1 (133.6), 1000-grain weight (24.55 g) and grain yield (5.64 t ha-1) were obtained from 75 kg N ha-1 and the lowest values were obtained from control. BRRI dhan52 fertilized with 75 kg N ha-1 showed best performance with respect to all the parameters studied. The overall results suggest that BRRI dhan52 should be fertilized with 75 kg N ha-1 for getting higher yield under the agro-climatic condition of BAU.J. Bangladesh Agril. Univ. 12(2): 321-324, December 2014

Performance of separated tillers of transplant Aman rice at different levels of urea super granules

An experiment was conducted at the research field of Department of Agronomy, Bangladesh Agricultural University, Mymensingh during June to December 2012 to investigate the effect of age of tiller seedlings, number of tiller seedlings hill-1 and application of urea super granules (USG) on the yield and yield contributing characters of transplant Aman rice (cv. BRRI dhan52). The experiment consisted of two ages of tiller seedlings viz. 25 and 35-days old, three levels of tiller seedlings hill-1 viz. 1, 3 and 5 seedlings hill-1 and three levels of USG viz. 0, 1.8 (55 kg N ha-1) and 2.7g USG (80 kg N ha-1) four hill-1 in every alternate row. The experiment was laid out in a Randomized Complete Block Design (Factorial) with three replications. The highest plant height, number of effective tillers hill-1, number of total tillers hill-1, number of total spikelets panicle-1, number of grains panicle-1, grain yield and harvest index were found in 1.8 g USG applied @ one granule 4-hill-1. The highest number of sterile spikelets panicle-1 was found in control treatment and the lowest in 1.8 g USG. The highest number of effective tillers hill-1, number of total spikelets panicle-1 and grain yield ha-1 was found when 5 tiller seedlings were transplanted hill-1 combined with 1.8 g USG. Application of urea super granules 1.8 g (55 kg N ha-1) at 10 days after transplanting @ one granule 4-hill-1 in every alternate row with 25 day old tiller seedlings using 5 tiller seedlings hill-1 was found beneficial for grain yield of transplant Aman rice. Tiller separation could be an alternative source of seedling during seedling scarcity.Bangladesh J. Agril. Res. 40(4): 581-590, December 2015

Effect of Seedling Number Hill–1 on the Yield of Modern T. Aman Rice Varieties under Tidal Non-Saline Ecosystem

The present experiment was conducted at the Agronomy Field, Patuakhali Science and Technology University, Patuakhali during the period from July to December 2012 to study the effect of modern varieties and number of seedlings hill –1 on the yield of Transplant Aman rice where six modern varieties viz. BR 11, BR 23, BRRI dhan40, BRRI dhan44, BINA dhan7 and BRRI dhan52 and three levels of seedlings number hill –1 viz. 3, 5 and 7 seedlings hill –1 were used under the tidal non-saline ecosystem. Results revealed that the interaction between varieties and seedling number hill –1 , the highest grain yield (6.15 t ha –1 ) and straw yield (8.10 t ha –1 ) were recorded from the variety BR 23 with 5 seedlings hill –1 . The highest number of effective tillers hill -1 (9.067) and 1000 grain weight (29.31 g) contributed to the highest yield in this treatment combination. Results suggested that the variety BR 23 is suitable with 5 seedlings hill -1 for higher yield under tidal non-saline ecosystem of Patuakhali. These significant variation results on yield and yield components may also be attributed to variation in genetic performance and the variation in their seedlings number hill –1 under regional adaptability of tidal non saline ecosystem of Patuakhali region. DOI: http://dx.doi.org/10.3329/jesnr.v6i2.22119 J. Environ. Sci. & Natural Resources, 6(2): 201-205 2013

Varietal performance of modern transplant Aman rice subjected to level of nitrogen application

An experiment was carried out at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during June to December 2012 with a view to finding out the effect of variety and nitrogen fertilizer application on the growth and yield of transplant Aman rice. The experiment comprised four varieties viz. BRRI dhan33, BRRI dhan34, BRRI dhan39 and BRRI dhan46, and four levels of nitrogen viz. control (no urea), prilled urea (50 kg N ha-1), one pellet (0.9g) of USG/4 hills of two adjacent rows (30 kg N ha-1) was applied at 10 DAT and two pellets of USG (0.9g each) one applied at 10 DAT and the other at 45 DAT/4 hills of two adjacent rows (60 kg N ha-1). The experiment was laid out in a randomized complete block design with three replications. Results of the experiment showed that variety and level of nitrogen application had significant effect on yield attributes and yield of transplant Aman rice. At maturity the tallest plant (122.60 cm) and the highest number total tillers hill-1 (12.72) were observed in two pellets of USG/4 hills providing 60 kg N ha-1. The highest number of tillers hill-1 (10.08) was obtained from BRRI dhan34 and the lowest one (9.88) from BRRI dhan33. The highest grain yield was obtained from BRRI dhan46 (4.56 t ha-1) and the lowest one (3.27 t ha-1) was obtained from BRRI dhan34. The interaction reveals that the highest grain yield (5.61 t ha-1) was obtained from the treatment combination of BRRI dhan46 with two pellets of USG (0.9g each) applied one at 10 DAT and the other at 45 DAT.DOI: http://dx.doi.org/10.3329/jbau.v12i1.21239 J. Bangladesh Agril. Univ. 12(1): 55-60, June 2014

Performance of transplant Aman rice as influenced by tiller seedlings and nitrogen management

An experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during the period from July to December 2012 to observe the effect of variety, age of tiller seedling used for transplanting and nitrogen management on the yield performance of transplant Aman rice. The experiment consisted of two varieties viz. BRRI dhan49 and BRRI dhan51, two ages tiller seedling viz. 25- and 35-day old, five nitrogen management viz. control (no urea), application of prilled urea @ 215 kg ha-1 (1/2 at 15 DAT+1/2 at 30 DAT), prilled urea @ 215 kg ha-1 (1/3 at 15DAT+1/3 at 30DAT+1/3 at 45DAT ), urea super granules (USG) 1.8 g and USG 2.7 g four-hill-1 in every alternate row. The experiment was laid out in randomized complete block design with three replications. The results revealed that higher plant characters, straw yield and harvest index were obtained from BRRI dhan49 compared to BRRI dhan51. Older seedlings (35-day old) produced higher grain yield to younger seedlings. The highest yield contributing characters and grain yield were obtained when 1.8g USG was applied. The grain yield was highest in 35-day old tiller seedlings of BRRI dhan51 while fertilized with 1.8g USG. This value was lowest when 25-day old tiller seedlings of BRRI dhan51 were fertilized with prilled urea in two split applications. It may be concluded that 35-day tiller seedlings of BRRI dhan51 fertilized with USG 1.8 g four-hill-1 could be used for achieving higher yield of transplant Aman rice. DOI: http://dx.doi.org/10.3329/jbau.v11i2.19903 J. Bangladesh Agril. Univ. 11(2): 249-256, 2013

Effect of Time of Tiller Separation on Grain Growth and Seed Yield of Transplant Aman Rice

An experiment was carried out to study the effect of time of tiller separation on grain growth and yield of transplant aman rice. The experiment consisted of 3 times of tiller separation viz. tiller separation at 25 (T1), 35 (T2) and 45 (T3) days after transplanting (DAT); and 5 levels of number of tillers kept hill-1 viz. intact hills (K0), 1 tiller kept hill-1 (K1), 2 tillers kept hill-1 (K2), 3 tillers kept hill-1 (K3) and 4 tillers kept hill-1 (K4). The experiment was conducted in randomized complete block design with three replications. The unit plot size was 4 m 2.5 m. With a few exceptions, the highest grain growth parameters like number of panicles hill-1, dry weight panicle-1, number of grains panicle-1, dry weight grain-1 and grain growth rate were observed when tillers were separated at 25 DAT but the lowest values were found at 45 DAT. The grain growth rate decreased with the advance of time. The highest grain yield (5.25 t ha-1) was obtained from tillers separated at 25 days after transplanting (DAT) but the lowest values (4.13 t ha-1) were recorded when tillers were separated at 45 DAT. The maximum grain yield (5.88 t ha-1) was found in intact hills, while the lowest values (2.64 t ha-1) were obtained when 1 tiller kept hill-1. DOI: http://dx.doi.org/10.3329/jsf.v10i1.16274 J Sci Foundation, January-June 2012;10(1):12-19