Archive | October, 2013

On arsenic and groundwater in West Bengal

9 Oct

I make a lot of presentations in India and elsewhere, explaining my work on groundwater in West Bengal. And almost always, the first question I get is: ‘but what about arsenic?’ And it is a very important question, something I want to answer carefully.

To be able to do so, my colleague, Nari Senanayake, now a graduate student at University of California at Davis and I decided to sift through evidence to understand what we know about entry of arsenic into human food chain through irrigation with arsenic rich water on the one hand and ways of mitigating the same on the other hand. To me, mitigation always seemed important. This is because, farmers in this part of the world, often don’t have any other viable livelihood alternative than irrigating with groundwater and in some places, this groundwater contains arsenic. I have noticed how easily one recommends that irrigation with groundwater be banned in such places, without providing any other alternatives. That, to me does not sound like a good public policy due to two reasons. First, such a ban can never be implemented in reality given that farmers depend on this resource for their livelihoods. Second, assuming it was possible to actually implement this ban, it will only make farmers poorer than they already are, and in the process, make them even more nutritionally insecure. There is a lot of literature to show that people with poor nutritional status are more prone to arsenic poisoning than others. Thus, in some sense, such a policy will end up victimizing the same people it was purportedly designed to serve!

Now coming back to our paper. This paper, titled ‘Irrigating with arsenic contaminated groundwater in West Bengal and Bangladesh: A review of interventions for mitigating adverse health and crop outcomes’ is now under review process of an ISI journal. But a few months ago, we published a working paper version of the same paper for a more policy oriented audience. Here is the paper.  

We looked at two distinct, but related aspects. First, we looked at consequences of irrigating with arsenic rich groundwater. Here, we reviewed 27 high quality studies that had credible counter factual and found that irrigating with arsenic rich water leads to accumulation of the same in soil, but not necessarily accumulation in crop parts in equal severity and that such accumulation depends on crop types and water management practices. But what was evident was that irrigating with arsenic rich water for long periods almost always led to decline in yields. 

Second, we looked at ways of mitigating the negative impacts of irrigating with arsenic rich water. Here, we reviewed 29 high quality studies with experimental design and found that there are at least 6 categories of interventions that have been tried and tested in the field or in the laboratories. And the good news is that most of these work, but work with varying degrees of success. These six categories of interventions are:

1. Improved water management practices like deficit irrigation

2. Correct doses of artificial fertilization and bio-remediation of soil

3. Switching to alternative field crops with low water requirement

4. Breeding arsenic tolerant rice varieties

5. Cooking rice with clean water and in traditional ways

6. Providing nutritional supplements to those most at risk

We explain the pros and cons of each of these interventions in our paper. To me, the most important take home message is that we have to move beyond scare mongering and find solutions to managing arsenic in agriculture. And that those solutions are already being tried and tested by scientists. What then is needed is to link this science with extension activities. Agricultural extension in India, has literally gone to the dogs. But, good extension services are now needed like never before. Therefore, for me, the greatest concern is not that some farmers are irrigating with arsenic rich groundwater. The greatest concern is that they are not aware that they are doing so in the first place and second, they are not aware of how they could potentially avoid the negative impacts of doing so by adopting some best practices. It is here that there is a huge role for innovative extension services — something that is conspicuous by its absence. 

And this, my friends, is my answer to: ‘But what do we do about arsenic?’


Greenpeace Grand Challenge on solar pumps in Bihar

9 Oct

Till a few years, I was rather skeptical about potential of solar pump technology to address energy squeeze in eastern India. Not so any more. And the reasons: rapid decline in costs of solar panels, which has been matched with equally rapid improvement in efficiency. Chances are, solar pumps will prove to be just as much of a breakthrough for farmers in eastern India, as diesel pump operatedshallow tubewells were in the 1970s and the 1980s. A number of small companies have come up with cost effective designs and the government of Bihar has launched a program to convert its defunct electricity operated public tubewells to solar pump powered tubewells. I have heard anecdotal stories of how solar pumps are being tested in few locations in Bangladesh. Many have asked me whether or not solar pumps can provide a long term sustainable solution in West Bengal. To me, the biggest barrier still seems to be the price, followed by portability of panels.

Greenpeace has taken this challenge head on and designed a grand challenge on designing cost effective solar pumps that can be adopted by farmers in Bihar. Their challenge question is simple: Can your design replace dirty diesel pumps in the fields of India? 

This challenge is open from 3rd September to 15th November 2013. I am on the jury of this challenge and will strongly encourage designers to come up with solutions to meet this challenge.

Read more on the Challenge here and happy submissions, folks!