Notes to broadcasters
Soil is a farmer’s most precious resource. Good soil is necessary for growing good crops. But if you farm on a hillside, rainwater can wash away your soil – and with it your livelihood. In this script, we talk with an expert who advises farmers that grow crops on steep hillsides how they can save their soil and maintain their livelihoods.
You might choose to present this script as part of your regular farming program, using voice actors to represent the speakers. If so, please make sure to tell your audience at the beginning of the program that the following short drama is based on a conversation with a real scientist, but that the voices are those of actors, not the original people in the script.
You could also use this script as inspiration to research and develop a radio program on soil erosion and methods to prevent it in your own country.
Talk to farmers and soil experts in your area. You could ask them:
- Are there any local areas which are at particular risk of soil erosion? If so, what steps can farmers take to minimize erosion?
- What are the best and most cost-effective ways to minimize soil erosion in this area?
Apart from speaking directly to farmers and other key players in the local agriculture sector, you could use these questions as the basis for a phone-in or text-in program.
This is a two-part script. The first part talks about methods for saving your soil if you grow on steep hillsides. The second part talks about methods for saving your soil if you grow on moderate or gentle slopes. You could air these scripts back-to-back, or perhaps one week apart.
Estimated running time: 10-12 minutes for both parts with intro and extro music.
Part A: Steep hillside land
Moving water, called run-off, is the main cause of soil erosion. Moving water removes the precious top layer of your soil, called topsoil. Clearing vegetation from the soil increases soil erosion, because roots absorb water and trap moving soil. Other major causes of soil erosion are overgrazing, burning crop residues, deforestation, global warming, and leaving the surface of your field bare for long periods of time.
There’s a big difference between growing your crops on a hillside and on flat land. Today, let’s talk about growing on sloping land.
Some hillsides are steeper than others and you know that the steeper the slope, the harder it is for you to work on it.
There’s another thing you may have noticed: If you cultivate land on a sloping field, when there’s a heavy rain, the rainwater can wash good soil off your hillside right down to the bottom of the hill. This washes your topsoil. And your topsoil contains most of your soil’s nutrients and organic matter.
When this happens, some people actually gather that good soil that washed down the hillside. They carry it back up the hill in baskets and spread it where it came from. That’s a very big job and takes a long time and is a lot of hard work. So most people don’t do it.
As more and more of their good soil is washed down the slope, farmers’ hillside land gets poorer and poorer for growing crops. Finally, in some fields, so much soil is washed down the slope that nothing will grow any more.
But some farmers don’t have this problem because they take special care to ensure that when it rains, their soil is protected. ___ is a soil and water specialist. Here he is to tell you how you can take special care to protect your soil.
But if you live in a hilly area, the hillside may be the only place you can grow your food. When it rains, you don’t want any soil erosion to take place on your land—that is, you don’t want any of your good soil to be washed down the slope.
Depending on how steep the slope is, farmers have solved this problem in many different ways. They’ve built terraces with stone, soil and sod; they’ve constructed bunds and grassed waterways; they’ve made bench terraces; they’ve cultivated across the slope instead of up and down–there are many ways.
In a hilly part of Nigeria, farmers grow vegetables on steep slopes. Not only do they save good soil from washing down the steep hillside, but they produce more food in a given area than many farmers do.
Another technique from Nigeria is to grow beans, maize and yams together in the same patch of ground. The maize stalks supply a support for the beans to climb up. They also provide a support for some of the yam vines.
In small areas where the maize does not grow very well, the yam vines move around to get the sun, and shade out the weeds. So they eliminate the need for hoeing.
The yams, the maize and the beans do not all ripen at the same time, so you can harvest food over a fairly long period of time.
As soon as you harvest the maize and beans and yams from a small area—let’s say a few square metres, you can dig up that area and plant it again while beans and maize are still growing on other parts of the same hillside.
This technique means that you are producing from the hillside on a continuing basis and you only have a small area cultivated and bare to the rain at any one time. The yield from a hectare of land cultivated in this way is often three or four times as great as if you merely grew maize or yams by themselves.
Let’s talk about farming on sloping land again. Today, we’ve talked about growing crops on steep hillside. Next time, we’ll discuss growing crops on moderate and gentle slopes.
Part B: Moderate and gently sloping land
In parts of Costa Rica where the slopes are moderate, Dr. ___ showed me how farmers raise their crops successfully while at the same time protecting their precious soil. They grow maize on hillsides, but they do it without cultivating their land. Here’s Dr. _____.
Then, when the rainy season begins, they plant their maize with a planting stick. This is a sharp-pointed cane, twice as thick as your thumb. They simply jab the stick right through the mulch and make a hole in the ground to put the seed in. When the maize sprouts, it grows right up through the mulch without any trouble.
The result is that good soil doesn’t get washed down the hillside like it would if the rain was falling directly on it, and with time the mulch breaks down and provides nutrients to subsequent crops. Also, the water soaks into the soil much better. By having mulch on top of the soil like this, these Costa Rican farmers are saving their precious soil.
Another thing – because of the mulch, weeds don’t grow. If the maize was growing on bare land with no mulch on top, the farmers would have to weed their crop twice during the growing season.
So there are three advantages here—reduced soil loss, nutrients for subsequent crops, and less labour for weeding.
What do you see when they do this and there is a heavy rain?
When farmers cultivate across the slope, as long as there’s a furrow, the furrow forms a small channel that holds the water and stops it from running downhill and eroding the soil.
So each row of the crop holds up a little bit of water and much more water is absorbed into the soil around the roots of the crop.
I asked ___ if he had any suggestions for farmers who work on small plots of sloping land. Here’s what he said.
Note: This script is adapted from Package 4, scripts 7 and 8, distributed in 1981. The original participants were George Atkins, founder of Farm Radio International; Professor Robert S. Broughton, hydrologist, Macdonald Campus, McGill University, Ste. Anne de Bellevue, Quebec, Canada; Dr. Warren Forsyth, Director, Inter-American Institute of Agricultural Sciences, St. Michael, Barbados; and Dr. David Kidd, Canadian Training Advisor, ICAR Dryland Project, Hyderabad, India. It was reviewed by Nsharwasi Leon Nabahungu,
Soil Scientist/System Agronomist, International Institute for Tropical Agriculture (IITA),
Bukavu, Democratic Republic of Congo.