Doubtly
@Doubtly · Joined Feb 2021
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- Why is irrigation essential? Irrigation helps to cultivate superior crops with the water supply as per the need of the crops. Ultimately it helps in economic development... 1
- Explain why a legume crop does not require nitrogenous fertilizers? The nitrogen-fixing bacteria reside in the root nodules of the leguminous plants. They convert atmospheric nitrogen into soluble nitrogenous... 1
- Give a short account of biofertilizers. Biofertilizers are the substance that contains microbes, which helps in promoting the growth of plants, trees by increasing the supply of es... 1
- What are fertilizers? Classify fertilizers. Fertilizers are chemical substances supplied to the crops to increase their productivity. The fertilizers contain the essential nutrients re... 2
- What is green manuring? Give suitable example for green manures. The process in which growing, ploughing and mixing of green crops along=g with soil to improve the physical and chemical structure of the so... 1
- Define manure. What are different manures and how do they affect the soil? Manure is an organic matter derived from the solid animal wastes, used to improve the soil quality and increase the yield of healthy crops.... 2
- Distinguish between farmyard manure and compost manure. Farmyard manure- It is the decomposed mixture of the cattle excreta and urine along with the litter and leftover organic matter such as fodd... 2
- Explain various methods of fertilizer application. Various methods of fertilizer application are: Broadcasting It refers to spreading fertilizers uniformly all over the field. Suitable for cr... 1
- How does the chemical nature of the soil change due to continued use of chemical fertilizers? The chemical nature of the soil changes due to the continued use of chemical fertilizers because it decreases the soil fertility of that par... 2
- Explain the term eutrophication with suitable example. The process in which water bodies like lake or slow-moving streams receive an extra amount of nutrients that help in the growth of plants su... 1
- During the downpour in a village, the rainwater carried away excess of nitrogenous and other compounds present Once the nutrients get absorbed in the pond water, it would acquire a high concentration of nitrates and phosphates which would result in th... 1
- Write down two advantages of fertilizer over manure. Answer: Fertilizers are rich in specific nutrients and act quickly, whereas manure has low nutrient content and acts slowly. Nutrient-specif... 1
- Compare the use of manures and fertilizers in maintaining soil fertility. Manure Fertilizer Contains organic substance Contains a large amount of chemicals It is biodegradable It is non- biodegradable Increases soi... 1
- Give two limitations of using manure. It is less rich in nutrients. It may lead to spreading of some harmful bacteria 1
- What are the advantages of using manure? These are a good source of macronutrients. Improves soil fertility. Cost-effective. Reduces soil erosion and leaching. Improves the physical... 1
- Choose the micronutrients and macronutrients from the following: Iron, Chlorine, Sulphur, Copper, Nitrogen Micronutrients: Iron, Chlorine, Copper, Manganese, Zinc, Molybdenum Macronutrients: Sulphur, Nitrogen, Calcium, Potassium, Magnesium, Phosph... 1
- Name the three most important nutrients required for plant growth. The three most important nutrients required for plant growth are Nitrogen, Phosphorus and Potassium. 1
- How plants get nutrients? Plants get nutrients from air, water and soil. 2