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Seasonal Influence on Yield and Yield Contributing Characters of Lablab Bean {lablab Purpureus (l.) Sweet}

M. Zashim Uddin
Horticulture Research Centre, Bangladesh Agricultural Research Institute, Gazipur- 1701

A. R. Chowdhury
Dept. of Horticulture, BSMRAU. Gazipur 1706

M. M. Hossain
Dept. of Horticulture, BSMRAU. Gazipur 1706

M. Moniruzzaman
Agricultural Research Sub-Station, Raikhali, Rangamati Hill District, Bangladesh

Abstract/ Executive Summary:

A study was conducted to evaluate the seasonal influence on yield and yield contributing characters of four lablab bean genotypes: IPSA Seam-I, IPSA Seam-2, BU Seam-3 and JER during September 2000 to December 200 I covering one main season (winter) and two off-seasons (early summer and late summer). Compared to off-seasons, all the genotypes performed better for all the parameters during winter. Every delay in planting was associated with significant reduction in yields and all yield contributing characters. Pod setting was reduced during late summer in all the genotypes. IPSA Seam- 2 produced the highest number of seeds per pod in all the seasons. The number of seeds per pod was greatly reduced in all genotypes during late summer. Most of the agronomic traits: number of inflorescence per plant, number of flower buds per inflorescence, number of pod set per inflorescence, number of pod per plant, single pod weight etc. were affected severely during off-seasons irrespective of genotypes. Lower number of pods and yield per plant in summer was accounted for by poorer viability, germination rate and tube growth of pollens resulting in 63 - 96% reduction in yield.

Keywords: Lablab bean, Yield, Yield contributing characters

Location: Horticultural Research Farm of Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur

Start Date: 00-09-2000

End Date: 00-12-2001

Program Area: Crop-Soil-Water Management

Commodity: Lablab bean

Objectives:

To identify the factors limiting lablab bean yield in off-season as compared to winter - the normal season.

Methodology:

The study was conducted separately in three seasons at the Horticultural Research Farm of Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur with four lablab bean genotypes - IPSA Seam-I, IPSA Seam-2, BU Seam-3 and JER (one parent of other three genotypes) during September 2000 to December 200 I covering three seasons: main season - winter (October - January) and two off-seasons- early summer (February - May) and late summer (June - September). The experiment was laid out in Randomized Complete Block Design with three replications. The unit plot size was 5 X 4m accommodating two rows per plot and 3 pits per row. Pit to pit and row to row spacing were 1.5m and 2m respectively. Two seeds of each genotype were sown per poly bag (12 X 18 cm) containing a mixture of equal proportion of well- decomposed cowdung and loamy soil on October 1,2000 for winter, February 15, 2001 for Early summer and June 9, 200 I for Late summer respectively. Fifteen days old seedlings were transplanted to the experimental plots. The land was fertilized with cowdung, oil cake, urea, TSP and MP @ 33000, 660, 80, 166 and 66 kg/hectare respectively. The full amount of cowdung, oil cake and TSP, one-third of MP and urea were applied basally in the pits one week before transplanting and mixed with the pit soil. The remaining amount of MP and urea were applied in three equal installments as top dressing at 15, 30 and 45 days after transplanting. The plants were initially irrigated by watering cane and later on surface irrigation was given whenever required. The crop was protected from the attack of insect pest mainly aphids, jute hairy caterpillar and pod borers by regular spraying of Nogos @ 2 ml/lit. water. The soil of the experimental field was clay loam in texture and acidic in nature with pH of 5.8. The daily average temperature, daily average relative humidity and monthly rainfall of the three seasons were respectively (a) winter - 21.94^oC, 70.80% and 13.17 mm, (b) early summer - 27.96°C, 72.02% and 205.98 mm and (c) late summer 29.96°C, 81.06% and 307.22 mm.

Source of Information: The Agriculturists, Vol: 5, (No-1&2), pp: 109-119, ISSN-1729-5211, Dec 2007

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The genotypes differed significantly from one another regarding agronomic traits. Every delay in planting was associated with appreciable reduction in yield and yield contributing characters. This yield reduction due to delayed planting was accounted for by the detrimental influence of environmental factors like high temperature, high humidity and high rainfall on embryological traits which lead to reduce number of pod set, reduced pod size and reduced number of pods per inflorescence; and ultimately reduced pod yield. IPSA Seam-2 performed better in respect of all parameters irrespective of seasons. Photo-insensitive genotypes of lablab bean could be grown successfully during winter and early summer in Bangladesh.

Knowledge Management: Journal