[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Transplanting duckweed.


>From: Stuart Bunting <swb1 at stir_ac.uk>
>To: "'Aquatic-plants'" <aquatic-plants at actwin_com>
>Subject: Re: Transplanting duckweed.
>Date: Wed, 30 Jul 1997 21:02:00 +0100
>During the autumn of 1995 I spent three months at the Bangladesh
>Agricultural University, Mymensingh, Bangladesh. Part of my field work
>involved researching the potential of  integrating the culture of
>duckweed (Lemna spp.) into ponds being used for the polyculture of
>Indian carps. The aim of this research was to help pond owners establish
>a culture of duckweed, thereby removing the need to employ children to
>collect duckweed from local (and not so local) water bodies, a common
>practice in the north-west region of Bangladesh.
>To initiate my cultures I collected duckweed from several local water
>bodies. I used a couple of cloth sacks to carry the  duckweed (50 kg)
>and the time between collecting the duckweed and transplanting it to the
>experimental ponds must have been between 2 and 3 hours; however, the
>duckweed didn't appear to be too stressed once transplanted.
>One last thing, during the field trials, the mid-morning surface (10 cm)
>water temperature in the experimental ponds gradually dropped from
>roughly 270C to 200C over a 40 day period, this falling temperature was
>enough to significantly retard the Lemna's growth rate. I'm not sure
>what the water temperature is like in your part of the world but might
>it be that the water temp' is low or fluctuating this year? It's just a
>Hope this is of some help, all the best.
>Stuart Bunting.