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Effect of Nitrogen on Yield, Yield Components and Contribution from the Pre-anthesis Assimilates to Grain Yield of Three Photosensitive Rice (oryza Sativa L.) Cultivars

Nur Ahmed
CSO (C.C)
Head, Entomology Division BRRI, Gazipur 1701

M. Eunus
Professor
Department of Agronomy BAU, Mymensingh 2202

M A Latif
PSO
Head, Plant Pathology BRRI, Gazipur 1701

Z U Ahmed
SSO
Soil Science Divison BRRI, Gazipur 1701

M Rahman
Assistant Professor and Extension Specialist, Plant Pathology
G151 South Ag. Sciences Building West Virginia University, P. O. Box 6108 Morgantown, WV 26506-6108 USA Email: mahfuzsfu@yahoo.com Phone: 304-293-8838 Cell: 304-288-9541

Abstract/ Executive Summary:

The experiment was conducted in the Agronomy field laboratory of Bangladesh Agricultural University to find out the pre-anthesis contribution to grain yield in selected rice varieties (BR22, BR23 and Nizersail ) of Bangladesh. Total tiller no./m², no. of effective tillers 1m²,spike let no.!panicle, %filled grain, 1000 grain wt; straw yield and grain yield varied significantly in different cultivars. Grain yield was highest in BR23 (5.08 t/ha) followed by BR22 (4.59 t/ha). Levels of N significantly influenced all the crop characters studied except 1000 grain wt. Increasing N level increased grain and straw yield. The interaction effect between cultivar and N was significant for effective tiller no./m², spikelet no./panicle, % filled grain, grain yield and % contribution to grain yield from pre-anthesis assimilates. Pre-anthesis assimilate contribution to grain yield was greatest with no N application (28% in BR22 and BR23), and was lowest at 120 kg N/ha (3% in Nizersail). The pre-anthesis assimilate contribution showed a negative relationship with increased N application. However, this relationship varied for different cultivars with BR 23 showing a greater capacity to mobilize pre-anthesis assimilates than BR22 and Nizersail.

Keywords: Grain yield, Nitrogen, Oryza sativa L., Pre-anthesis assimilates, Rice

Location: BAU, Mymensingh

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

The objective of this experiment was to examine the effect of pre-anthesis contribution to grain yield of three rice varieties under five N Ievels.

Methodology:

The experiment was laid out in split-plot design with four replications in a 5 x4 m² plot, spaced at 25x15 cm using two seedlings/hill. Levels of nitrogen were 0,60,80,100,120 kg/ha. Main plot and subplot treatments were variety and levels of nitrogen respectively. Grain yield was measured at maturity by harvesting 5 m² from the centre of each plot. Yield components were recorded from 10 randomly selected hills from each plot. Stem weight at anthesis was recorded by harvesting an area of 0.25 m² in each plot. The stems including leaves were dried at 85°C for 24 hours and weighed separately. At pre-anthesis, stems were weighed together with leaves since leaves contributed little to grain yield from pre-anthesis assimilation. The data were analysed following standard statistical procedures.

Source of Information: J. Natn. Sci. Coun. Sri Lanka. 26(1): 35-45.

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The pre-anthesis assimilate contribution showed a negative relationship with increased N application. However, this relationship varied for different cultivars with BR 23 showing a greater capacity to mobilize pre-anthesis assimilates than BR22 and Nizersail.

Knowledge Management: Journal