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Effect of Planting Dates on the Growth and Yield of Sweet Potato Genotypes at Sylhet in Bangladesh

AA Shimu
Department of Horticulture, Sylhet Agricultural University, Sylhet 3100, Bangladesh

MSIslam*
Department of Horticulture, Sylhet Agricultural University, Sylhet 3100, Bangladesh

AC Das
Department of Horticulture, Sylhet Agricultural University, Sylhet 3100, Bangladesh

A Biswas
Department of Horticulture, Sylhet Agricultural University, Sylhet 3100, Bangladesh

Abstract/ Executive Summary:

The study was conducted during September 2013 to March 2014 at the experimental field of Sylhet Agricultural University with a view to characterize and evaluate the growth and yield of three exotic sweet potato genotypes viz.SP004, SP006 and SP007 planted at three dates viz., 1 September, 1 October and 1 November 2013 following randomized complete block design (Factorial) with three replications. Growth and yield of sweet potato were largely influenced by genotypes. The highest number of storage roots plant-1was recorded from the genotype SP006 (4.93) which were identical to SP004 (4.44). The corresponding highest storage root yield plant-1(381.44 g) and hectare^-¹ (21.01 t) was also measured from the genotype SP006 while it was the lowest for SP007 (18.03 tha^-1). Date of planting did not influence the growth and yield of sweetpotato significantly. Average storage root yield hectare-1for 1 November planting was 20.5 t ha^-1followed by 1 October (20.13 t) and 1 September (18.36 t ha^-1) planting. However, among the genotypes, SP007 yielded the highest (22.5 t ha^-1) planted at 1 November followed by 1 October planting (21.9 t ha^-1). Similar yield was also exhibited by the genotype SP006 which produced 21.9 t and 21.6 t of storage root hectare^-1 from 1 October and 1 November planting, respectively.

Keywords: Genotypes, Planting dates, Sweet potato, Yield.

Location: Experimental field of Horticulture Department, Sylhet Agricultural University during September 2013 to March 2014

Start Date: 00-09-2013

End Date: 00-03-2014

Program Area: Variety and Species

Commodity: Sweet potato

Objectives:

Three Japanese sweet potato genotypes were evaluated at the experimental field of Sylhet Agricultural University for assessing growth and yield of storage root under different planting dates.

Methodology:

The experiment was conducted at the experimental field of Horticulture Department, Sylhet Agricultural University during September 2013 to March 2014 to evaluate the performance of sweet potato genotypes under different planting dates. The experimental site belongs to the Agro-Ecological Zone 20 of the Eastern Surma Kusiyara Floodplain. The soil was gray, sandy loam with organic matter content of 1.79%, P^H 4.98, total N 0.09%, exchangeable K 0.13 meq 100^-¹ g soil, available P14.98 μg g^-¹ soil and available S 27.01 μg g^-1 soil. Three Japanese sweet potato genotypes (SP004, SP006 and SP007) were evaluated at three planting dates 1 September, 1 October and 1 November 2013. The experimental land was first opened using a power tiller and subsequently spading and followed by laddering to obtain the desirable tilth. Hence the land was acidic in nature, lime (Dolomite) was applied in the field @ 4 kg decimal^-1. The recommended dose of cowdung @ 20 t ha^-1, TSP @ 60 kg ha^-1, ZnSO4@ 5 kg ha^-1, half dose of MoP @ 150 kg ha^-¹ and half dose of Urea @ 135 kg ha^-¹ were applied basally during land preparation one week before transplanting. The remaining MoP and urea were applied in three equal installments as top dressing at 30, 45 and 60 day after planting. The experiment was conducted in a Randomized Complete Block Design (Factorial) with three replications. The unit plot size of the experiment was 1.2 m × 3.0 m where spacing was maintained at 60 cm and 30 cm between row to row and plant to plant, respectively. As a result there were 2 rows per unit plot and ten plants row-1. Fifteen centimeter long terminal vines having at least three nodes were burried in the soil of experimental field. Irrigation, drainage, gap filling, weeding, mulching and vine lifting were done whenever necessary. Sweet potato from all planting dates was harvested at 135 day after planting with the help of spade to record yield and yield attributing parameters. Collected data on different parameters were subjected to MSTATC software for analysis of variance and mean separation was done as per Duncan's Multiple Range Test (DMRT).

Source of Information: J. Sylhet Agril. Univ. 3(1):41-44, 2016 ISSN: 2308-1597

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

A remarkable yield variation was found in the interaction effect between genotypes and planting dates. Interaction effect between genotypes and planting dates indicated that the genotype SP007 along with 1 November planting gave the highest yield (22.5 t ha^-1). After that the second highest yield (21.9 t ha^-1) was noticed from two genotypes SP006 and SP007 at 1 October planting. Finally the lowest yield (15.3 t ha^-1) was recorded from the genotype SP007 when planting was done at 1 September. Considering above results and discussion the genotypes SP006 and SP007 along with BARI released high yielding sweet potato variety(s) may be undertaken for further evaluation at Sylhet region for final and more useful recommendation.

Knowledge Management: Journal