Anirudh Kumar
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Compare the use of manure and fertilizers in maintaining soil fertility.

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Important NCERT Questions
Improvements in Food Resources
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Intext Questions
Page No-207
Questions No-1

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  1. Plants obtain nutrients through a process called photosynthesis, which is the key mechanism by which they convert light energy into chemical energy. In photosynthesis, plants use the energy from sunlight to convert carbon dioxide and water into glucose, a form of sugar. This process takes place in the chloroplasts of plant cells, where chlorophyll, a green pigment, captures sunlight and facilitates the conversion of carbon dioxide and water into glucose. While this process provides plants with a source of energy, it doesn’t cover all the nutrients they need for growth and development.
    In addition to photosynthesis, plants also acquire essential nutrients from the soil through their root systems. Roots absorb water and minerals from the soil, and these minerals include vital nutrients such as nitrogen, phosphorus, and potassium. The plant’s root system has specialized structures, like root hairs, that enhance nutrient absorption. As water moves through the plant, carrying dissolved minerals with it, these nutrients contribute to various biochemical processes necessary for plant growth, including the formation of proteins, nucleic acids, and other essential molecules. In summary, plants derive energy through photosynthesis and acquire essential minerals from the soil to meet their nutritional requirements and support their overall health and development.

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  2. Manure contains many organic substances of biological origin which can be easily degraded and absorbed by plants. It helps in recycling of biological waste. Manures increase the fertility of soil for long duration without causing any harm. However, the chemical fertilizers (e.g., urea) improve soil fertility for short duration but cause environmental hazard. Continuous use of fertilizers in a particular area/crop field causes destruction of soil fertility.

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  3. Effects of using manures on soil quality:

    1. The manures enrich the soil with nutrients.
    2. They provide a lot of organic matter (humus) to the soil and thus restores water retention capacity of sandy soils and drainage in clayey soil.
    3. The addition of manures reduces soil erosion.
    4.  They provide food for soil organisms, like soil friendly bacteria.

    Effects of using fertilizers on soil quality:

    1. By the continuous use of fertilizers, the soil becomes powdery, dry and rate of soil erosion increases.
    2. By the use of fertilizers, the organic matter decreases which further decreases the porosity of soil and the plant roots do not get oxygen properly,
    3. The nature of soil changes to acidic or basic.
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  4. Manures increase soil fertility by enriching the soil with organic matter and nutrients as it is prepared by the decomposition of animal excreta and plant wastes. On the other hand, fertilizers are mostly inorganic compounds whose excessive use is harmful to the symbiotic micro-organisms living in soil. Their excessive use also reduces soil fertility. Hence, fertilizers are considered good for only short term use.

    For more answers visit to website:
    https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-15/

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