Fertilisers
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What does fertilizer do?
Replaces the missing nutrients.
What do NPK fertilizers contain?(3)
• Nitrogen for growth of leaves and stems • Phosphorus for healthy roots • Potassium for healthy leaves and flowers
Both _____ and _____ help reactions in photosynthesis and _____ to work.
Phosphorus Potassium Respiration
What are proportions of NPK?
25:0:16
Why are artificial and chemical fertilizers used in huge amounts?
Easy to store and add to the land.
Can fertilizers cause pollution?
Yes rain can wash fertilizers into rivers and streams where it causes water pollution.
Why do farmers prefer natural fertilizers?
They add humus to the soil. And it rots down and release nutrients more slowly.
What is the problem of natural fertilizers?
Farmer doesn’t know the amount of each nutrient in the fertilizer is not known.