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Effect of Growth Regulators on Vegetative Growth and Grain Yield of Rice

M. T. Islam
Department of Crop Botany, Bangladesh AgriculturaI University, Mymensingh.

M. M. Rahman
Department of Crop Botany, Bangladesh AgriculturaI University, Mymensingh.

Abstract/ Executive Summary:

The effects of cycocel, alar and GA and their interactions on Nizershail cuItivar of rice were assessed under field condition. Foliar spray of cvcocel and alar decreased plant height but increased the total and effective number of tillers. Lower doses of alar also increased yield contributing characters and yield of rice. Gibberllic acid increased the height, total number of tillers and effective tillers in comparison with the control. A combination of GA and cvcocel decreased the totaI number of tillers but slightly increased height, elfective tillers, fertility and uItimately the yield. Interaction of GA with alar at highest concentration slightly increased height but decreased tiller number, number of fertile grains and the total yield.

Keywords: Growth regulators, Yield, Rice, Vegetative growth

Location: Barrgladesh Agricultural UniVersity Farm

Start Date: 21-08-1983

End Date: 17-12-1983

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To assess the effects of these substances GA, alar and cycocel, applied singly and in combination on rice ( Oryza sativa) plants.

Methodology:

The experiment was laid out in a randomized block design. Each treatment was replicated thrice. Total number of plots were 48 each of which measured 4.5 m x 3.0 m. The cultivar used was Nigershail. Thirty days old seedlings were transplanted with two seedlings per hill on 21 August 1983 at a spacing of 15 cm x 50 cm. The crop was fertilized following the usual method with 50, 30 and 25 kg per hectare of N, P₂0₅and K₂0 respectively. The Inter cultural operations were done as usual. The crop was harvested on 17 th December, 1983. Data were recorded from ten randomly selected hill per plot. Plant height was measured at weekly interval. Data collected at harvest were plant height, total number of tillers per hill, number of ear bearing tillers per hill, Iength of panicle, number of fertile grain per panicle, number of non-fertile grain per panicle, number of total grain per panicle, weight of 1000 grain and grain yield per plot. The data were statistically analyzed and means were adjusted as per Duncan's New Multiple Range Test.

Source of Information: Bangladesh J. Agric. Sci. 15 (2) ; 249 - 253, 1988

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

A combination of GA and cvcocel decreased the totaI number of tillers but slightly increased height, effective tillers, fertility and uItimately the yield. Interaction of GA with alar at highest concentration slightly increased height but decreased tiller number, number of fertile grains and the total yield.

Knowledge Management: Journal