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Picking Times and Storage Duration Effects on Hard Seededness in Mungbean [vigna Radiata (l.) Wilczek]

M. A. Afzal
Pulses Research Centre, Bangladesh Agricultural Research Institute, Gazipur-1701, Bangladesh.

Mia. Md. Bashir
Pulses Research Centre, Bangladesh Agricultural Research Institute, Gazipur-1701, Bangladesh.

Nusrat Karim Luna
Pulses Research Centre, Bangladesh Agricultural Research Institute, Gazipur-1701, Bangladesh.

M. Moynul Haque
Pulses Research Centre, Bangladesh Agricultural Research Institute, Gazipur-1701, Bangladesh.

M. A. Bakr
Department of Agronomy, BSMRAU, Gazipur-1703, Bangladesh.

M.S. Akhtar
Department of Agronomy, BSMRAU, Gazipur-1703, Bangladesh.

Abstract/ Executive Summary:

An experiment was conducted to observed the picking times and storage duration effects on hard seededness and germinability of six mungbean cultivars. Six mungbean cultivars viz. Barimung-2, Barimung-3, Barimung-4 representing small seeds and Barimung-5, Binamung-5 and BUmug-1, representing bold seeds were considered for the experiment. Mungbean pods were picked three times by 15 days intervals and subjected to germination test during subsequent three months. Seedhardness or germination capacity of mungbean cultivars did not very remarkably over three months periods stored at 20°C. But both picking seeds and varieties influenced significantly on seededness and showed better germination percentage during second and third picked seeds.

Keywords: Mungbean, Picking times, Storage duration, Hard seededness

Location: Regional Agricultural Research Station, Rahmatpur, Barisal, Bangladesh

Start Date:

End Date:

Program Area: Seed Technology

Commodity: Mungbean

Objectives:

To evaluate the effect of picking times and storage duration on hard seededness in mungbean seeds.

Methodology:

As experiment was carried out with six mungbean varieties viz., Barimung-2, Barimung-3 and Barimung-4, Barimung-5, Binamung-5 and Bumug-1. Seed size of Barimung-2, Barimung-3 and Barimung-4, range 24.9 to 29.8 mg and that of Barimung-5, and Bumug-1 range from 41.9 to 42.6 mg. Mungbean seeds were shown on 20 January 2001 at Regional Agricultural Research Station, Rahmatpur, Barisal, Bangladesh. The crop was managed properly and mature pods were picked by three times. First picking was done at 60 days after sowing (DAS), second at 75 DAS and third at 90 DAS. Seeds of each picking were sun dried to 12% moisture content and stored at 20°C. First germination test was performed immediately after storing and another two tests were done by one month interval. For each germination test, 100 seeds were placed on moist pads in petri dishes and allowed to germinate 27°C for 96 hours. The numbers of germinated and hard seeds were then counted and expressed as a percentage of total seed tested. Rotten seeds were not taken in analysis of variance and means comparison.

Source of Information: Asian Journal of Plant Sciences 2 (7): 566-568, 2003 (ISSN 1682-3974)

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

There was however, a vertical difference in seed hardness and germination capacity of mungbean. The cultivars Barimung-2, Barimung-3 and Barimung-4 maintained consistently better germination over Barimung-5, Binamung-5 and Bumug-1 through out the three testing months. Although a seeds of first and second picked seeds of Barimung-5, Binamung-5 and Bumug-1 showed as well germination capacity, but its germination percentage reduced drastically at third picking time. Germination percentage of third picked seeds of Binamung-5 and Bumug-1 and Barimung-5 dropped to 76.7, 82.7 and 88.7% respectively. This variation in germination percentage i.e. reversely seed hardness clearly indicated that germination capacity of mungbean depends on seed size as well as on picking time. Seed size of Barimung-2, Barimung-3 and Barimung-4 is much smaller than of Barimung-5, Binamung-5 and Bumug-1. Smaller sized seed of these cultivars might posses some physical properties related to seed cost that helped easy imitation of water into the seeds. The highest germination percentage was recorded in first picked Barimung-5, which maintained 99.0, 100.0 and 98.3% germination during first second and third months respectively. Such germination results revealed that seed deterioration did not occur for short-term strong at 20°C. On the contrary, small sized seeds of either Barimung-3, or Barimung-4, showed higher germination percentage than bold seeded cultivars during second or third picking time. Therefore irrespective of seed size and variety, first picked seeds of all mungbean cultivars are better germinable than the second and third picking seeds. It is better to avoid second or third picking for seed purpose but if necessity, second and third picked seeds of small seeded variety may be used for mungbean cultivation. The experiment is limited with in the seed size 42.6 mg. Hence further study with more bold seeds is necessary to explore the effect of seed size on seed hardness of mungbean.

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