MediumBiologyHigh School (9–10)GeneralBiology in Human Welfare › Improvement in Food ResourcesNumerical
A village tank stores 18 000 m³ of rain run-off…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A village tank stores of rain run-off. A millet crop needs of water for each hectare in a season. How many hectares can the tank irrigate? How many hectares could it irrigate if the villagers grew a crop that needs only for each hectare?
Need a reminder? The key ideaShow
A plant needs 16 nutrients: carbon, hydrogen and oxygen from air and water, and 13 from the soil (6 macronutrients and 7 micronutrients). Manure adds organic matter. Fertilisers give nitrogen, phosphorus and potassium. Wells, canals, river lift systems and tanks bring water. The cropping patterns are mixed cropping, inter-cropping and crop rotation.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Millet. hectares.
Step 2. The other crop. hectares.
Answer: hectares of millet, or hectares of the crop that needs less water.
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