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Effect of Water Stress on Reproductive Stages in Transplanted Aman Rice

Md. Abdul Karim
Former MS Student
Department of Crop Botany, BAU, Mymensingh

Dr. Md. Tariqul Islam
Principal Scientific Officer and Head
Crop Physiology Division, Bangladesh Institute of Nuclear Agriculture, BAU Campus, Mymensingh-2202, Bangladesh

Dr. M. Tazul Islam
Ex-Director
GTI, Bangladesh Agricultural University, Mymensingh

Abstract/ Executive Summary:

An experiment was conducted at the Bangladesh Institute of Nuclear Agriculture, Mymensingh during August 15 to December 8, 2000. The experiment included two factors (i) four water stress viz., 100% FC (control) was imposed from booting to maturity and 30% FC was imposed at booting, flowering, grain filling stages and, (ii) four aman rice varieties, namely, BRRI dhan3l, BRRI dhan32, BRRI dhan33 and Binadhan-4. Plant height, number of tillers plant^-1, number of panicles plant^-1, panicle length, number of filled grains panicle, 1000-grain weight, harvest index (HI), total dry matter (TDM) and yield were decreased with the stress treatments than that of irrigation condition (control). Plant height, number of tillers plant^-1, number of panicles plant^-1, panicle length, 1000-grain weight, total dry matter plant^-1were affected more by the stress at booting but number of filled gains plant^-1 was affected more at flowering stage. Water stress affected HI similarly in all the growth stages. Comparatively less effect of water stress was observed at gain filling stage. Among the four varieties, Binadhan-4 produced more tillers, panicles plant^-1, the highest 1000-grain weight and the highest yield under water stress.

Keywords: Rice, Water stress, Growth stage, Yield

Location: Bangladesh Institute of Nuclear Agriculture, Mymensingh

Start Date: 15-08-2000

End Date: 08-12-2000

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

The objectives of the study were to evaluate the effect of water stress at booting, flowering and grain filling stages of aman rice varieties and to find out critical reproductive stage and identify stress tolerant variety.

Methodology:

An experiment was conducted at the Bangladesh Institute of Nuclear Agriculture, Mymensingh during August 15 to December 8, 2000. The experiment included two factors (i) four water stress viz., 100% FC (control) was imposed from booting to maturity and 30% FC was imposed at booting, flowering, grain filling stages and, (ii) four aman rice varieties, namely, BRRI dhan3l, BRRI dhan32, BRRI dhan33 and Binadhan-4.Rice was grown in plastic pots. Each pot contained 3.5 kg soils collected from BINA farm. The soil was sandy loam in texture having pH 6.7. Three seedlings of 30-day old were transplanted in each pot on 15 August, 2000. The seedlings were thinned to single plant per pot at 2 weeks after transplanting. Urea 576 mg. TSP 560 mg, MP 320 mg and Gypsum 66 mg per pot were applied following 90-84-60-5 kg of N-P₂O₅-K₂O-S fertilizer ha^-1respectively. The whole amount of TSP, MP and Gypsum were mixed with the soil as basal does during pot preparation. The Urea of a pot was applied in three installments equally to the soils at 7 days, 21 days and at maximum tilling stage, respectively after transplanting. Cultural practices were done whenever it needed. The pots were kept to field capacity until the initiation of water regime treatments with the supply of water. The pot experiment was arranged in 2 factors completely randomized design with 3 replicated pots. Amount of water to be added to maintain the desired water level was measured by weighing the pots at alternate days. The rice plants were harvested at maturity for measurement of yield and yield components. The data were analyzed statistically following two and three factor experimental design of CRD by MSTAT computer packages (Freed, 1986).

Source of Information: MS thesis by MD. ABDUL KARIM, Examination Roll No. 14, Reg. No. 18298, Session: 1991-92, July-December, 2001, Department of Crop Botany, BAU, Mymensingh

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Plant height, number of tillers plant^-1, number of panicles plant^-1, panicle length, number of filled grains panicle, 1000-grain weight, harvest index (HI), total ddy matter (TDM) and yield of rice varieties were decreased with the stress treatments than that of irrigation condition (control). Varieties responses were different for most of the characters and they had different degree of reduction. Plant height, number of tillers plant^-1, number of panicles plant^-1, panicle length, 1000-grain weight, total dry matter plant^-1were affected more by the stress at booting but number of filled gains plant^-1 was affected more at flowering stage. Water stress affected HI similarly in all the growth stages. Comparatively less effect of water stress was observed at gain filling stage. Among the four varieties, Binadhan-4 produced more tillers, panicles plant^-1, the highest 1000-grain weight and the highest yield under water stress.

Knowledge Management: Thesis