7. Explain how soil gets affected by the continuous plontion of crops in a field.
8. If wheat is sown in the Kharif season, what would happen? Discuss.
9. Explain how fertilizers are different from manners.
10. Mention any two techniques of removing the weeds.
Answers
Answer:
Explanation:
1. Continuous plantation of crops in a field makes the soil poor in certain nutrients such as nitrogen, phosphorus, potassium, etc. Plants require nutrients for their proper growth and functioning.
2. If wheat is sown in the kharif season (from June to October), then the whole crop might get destroyed because of many factors such as lack of optimum temperature, adaptability, availability of pests, etc. Kharif season includes the rainy season, which is not favourable for the growth of wheat crop.
3.Manure is an inorganic substance that is obtained from decomposition of vegetable and animal wastes. Microbes are needed to form manure since they degrade the organic substances. Fertilizers are easy to transport ,store and apply to crops. Fertilizers do not help in retention of water.
4. Weeding is the process to remove out the weeds. Weeds are unwantedvplants which grown along the useful crops. Weeding is required because weeds are competitive plants as they reduce the useful crop yield by acquiring space, fertilizers and nutrients from the soil.