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Impact of Fertilizers on the Seed Quality of Aromatic Rice

M. F. Hossain
School of Agriculture and Rural Development, Bangladesh Open University, Gazipur, Bangladesh

Abstract/ Executive Summary:

This experiment was conducted in field and laboratory to evaluate the effect of fertilizer application doses in mother plant plots on seed viability, germination and vigor (seedling length) of aromatic rice. The aromatic rice varieties Kataribhog, Badshabhog and BRRI dhan37 were grown with five fertilizer treatments viz., control (no fertilizer), recommended NPKSZn chemical fertilizers, cow dung 5 t/ha, green manure (Sesbania rostrata) 10 t/ha and recommended NPKSZn chemical fertilizers with green manure (Sesbania rostrata) 5 t/ha. Seed quality parameters viability, germination and vigor were determined after six months of storage period. Results from tests in the laboratory showed that viability, germination, vigor of aromatic rice seeds were affected by applications of different fertilizer doses in mother plant field, variety and interaction of variety and fertilizer. All the fertilizer treatments except recommended NPKSZn chemical fertilizer dose kept an acceptable level of germination percentage (>80%) but without fertilizer treatment showed better performance in respect of viability, germination and seedling length. Local aromatic rice varieties Kataribhog and Badshabhog performed better than modern aromatic rice variety BRRI dhan37.

Keywords: Aromatic rice, Fertilizer, Germination, Seedling length, Viability, Vigor

Location: Hajee Mohammad Danesh Science and Technology University Farm, Dinajpur, Bangladesh

Start Date: 00-07-2009

End Date: 00-11-2009

Program Area: Seed Technology

Commodity: Rice

Objectives:

The present research was carried out in order to evaluate the impact of fertilizers application on the seed quality of aromatic rice.

Methodology:

The field experiment was conducted at the Hajee Mohammad Danesh Science and Technology University Farm, Dinajpur, Bangladesh during July to November of 2009. The experimental site was a medium high land belonging to the non-calcareous dark gray floodplain soil under the agro-ecological zone (AEZ-1) of Old Himalayan Piedmont Plain (UNDP & FAO, 1988). The soil samples of the experimental site were analyses in the Soil Resource Development Institute (SRDI), Dinajpur, Bangladesh. Field with sandy loam soil having a pH value of 6.0. The soil was rich in P, S, Mn, Fe, Cu and other nutrients were some extent lower compared to the critical level. The experiment was laid out in a randomized complete block design with three replications. The experiment consisted of five fertilizer treatments viz., T₁= Control (No fertilizer), T₂ = Recommended NPKSZn chemical fertilizer dose (Urea =150 kg/ha, Triple super phosphate (TSP) = 60 kg/ha, Murate of potash (MOP) =120 kg/ha, Gypsum = 90 kg/ha and Zinc sulphate (ZnSO₄)= 2.5 kg/ha, T₃ = Cow dung 5 t/ha, T₄ = Green manure (Sesbania rostrata) 10 t/ha and T₅ = Recommended NPKSZn chemical fertilizer dose with green manure (Sesbania rostrata) 5 t/ha. Three aromatic rice varieties viz. Kataribhog, Badshabhog and BRRI dhan37 were used. The unit plot size was 4.0m X 2.5m. P, K, S and Zn fertilizer were applied as basal at final land preparation. Well-decomposed sundry cow-dung = 5 t/ha was mixed in the defined specific plots at the time of final land preparation. Nitrogen was applied in the form of urea =150 kg/ha in two equal splits at 20 and 45 days after transplanting. Thirty-day-old seedlings were transplanted in the plots at a spacing of 20 cm X 15 cm using 3 seedlings/hill. All other cultural practices were done uniformly as per recommendation. Individual plots were harvested to obtain seeds. After proper drying, 5 kg of each variety of seeds were put in airtight plastic containers and kept in laboratory November 2009 to April 2010. The seed quality study was conducted at the Agronomy laboratory of the university. After six months of storage seed samples were tested for viability, germination and vigor (seedling length) using a Completely Randomized Design (CRD) with four replications. Seeds were placed on the moist filter paper in Petri-dishes and germination was calculated following standard method (ISTA, 1966). Normal seedlings were counted following the methods of Thomson (1979). All the germinated seeds (normal and abnormal seedlings) were counted for viability test and normal seedlings were counted for germination test. For vigor test, the indirect method ‘Seedling length measurement’ was followed. Length of radicle and plumule of 10 seedlings (at random) from each samples were measured and recorded which is the indication of seed vigor (Huda, 2001). Data on various parameters were statistically analyzed and Duncan’s Multiple Range Test (DMRT) compared the means.

Source of Information: Journal of Agricultural Science; Vol. 6, No. 6; 2014 ISSN 1916-9752 E-ISSN 1916-9760

Article Link (Online Journal): http://www.ccsenet.org/journal/index.php/jas/article/viewFile/31803/20680

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Results from tests in the laboratory showed that viability, germination, vigor (seedling length) of aromatic rice seeds were affected by applications of different fertilizer doses in mother plant fields, varieties and interaction of varieties and fertilizer doses. Fertilizer treatments except recommended NPKSZn chemical fertilizer dose maintained an acceptable level of germination percentage (>80%). Seed showed better performance in terms of seed viability, germination and vigor without fertilizer in the mother plant field after six months of storage, most probably due to lower seed moisture content. Moisture content of seeds from control treatment was maintained at 13% and this probably remained viable after 6 months of storage. The abrupt increase in moisture content from 11% before storage to 17% after 2 months in storage may have contributed to the significant decline germination. Since at 14% moisture content storage fungi that contribute to faster seed deterioration start to become active.

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