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IMPROVING SEED GERMINATION OF DERRIS INDICA BY VERTICAL SOWING

C. Swaminathan, R. S. Vinaya Rai, K. K. Suresh and K. Sivaganam
Journal of Tropical Forest Science
Vol. 6, No. 2 (December 1993), pp. 152-158
Stable URL: http://www.jstor.org/stable/43581733
Page Count: 7
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IMPROVING SEED GERMINATION OF DERRIS INDICA BY VERTICAL SOWING
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Abstract

Seeds of Derris indica were sown by five different methods. Sowing the seeds vertically with the micropyle directed downwards gave the maximum germination of 92%. Vertical sowing with the micropyle oriented laterally and upwards recorded respectively germinability of 58 and 66%. Sowing the seeds flat gave germination of 72% indicating that micropyle orientation is more important than disposition of seed vertically or flat. Parameters like germination energy, germination value and emergence energy value were also high when seeds were sown vertically with the micropyle pointed downwards. The plausible reason for this is discussed. The study has failed to sustain the contention that germination is positively correlated with seed soil contact area. The study also indicates that presowing treatment with water is not necessary for maximising germination for this species. Biji benih Derris indica di semai dengan lima cara yang berlainan. Biji benih yang di semai secara menegak dengan mikrofil menghadap ke bawah memberikan peratus percambahan yang maximum, sebanyak 92%. Penyemaian secara menegak di mana mikrofil di letakkan dalam keadaan melintang memberikan 58% percambahan manakala mikrofil yang menghadap keatas memberikan 66% percambahan. Penyemaian biji benih dengan mikrofil dalam keadaan terlentang memberikan 72% percambahan. Inijelas menunjukkan yang orientasi mikrofil adalah lebih penting dari posisi biji benih sama ada secara menegak atau melintang. Parameter-parameter seperti tenaga percambahan, nilai percambahan dan nilai tenaga percambahan juga tinggi apabila biji benih di semai secara menegak dengan mikrofil menghadap ke bawah. Penjelasan tentang hasil kajian ini di bincangkan. Namun demikian hasil kajian ini gagal membuktikan korelasi positif antara percambahan dan kawasan sentuh tanah-biji benih. Kajian ini juga menunjukkan rawatan air sebelum penyemaian tidak memaksimakan peratus percambahan spesies ini.

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