Question

Give reasons for the following:-

1) Excess water supply can damage crops.
2)Grains are not stored without sun-drying.
3)Overuse of the pesticides should be avoided.

PLEASE ANSWER IT FAST.
IT IS URGENT.

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Answer 1

1)  Following harmful effects cause due to excess water-

i)The field will get water logged and the crop cannot get sufficient water and air, as good aeration and warmth in the root zone are essential for proper plant growth.

ii)Bacteria that change organic matter into plant foods cannot get necessary air and warm temperature in the soil.

iii)Desirable chemical reactions cannot take place and nutrient availability is not easily to the plants.

iv)Proper root development and absorption of nutrients is not accelerated.  

v)Seed germination is affected due to poor aeration and warm temperature.

Excess water cause water logging conditions, soil may be ill drained and causes following harmful effects.

a)In low lying areas excess water if cannot be carried away as surface runoff causes water logged condition which affects aeration and soil temperature.

b)The fine texture soils due to poor permeability the water cannot move downward fast enough and accumulates on the surface, obstructing aeration. In sandy soil if heavy irrigation is given the water will rapidly percolate down and will be wasted.

c)The water table may be high and the additional water accumulates and chokes the air spaces and saturates the surface and sub-soil.

d)Many toxic salts affecting water absorption by roots and causes damage to crops.

e)Agricultural operation viz. inter cultivation cannot be carried out properly.

f)Weeds, which compete for nutrients, space and light, grow rapidly and interfere, crop growth and cultural operations.

2) The Greens are Sun dried before storing as this prevents growth of microbes on them.

3) The overuse of pesticides should be avoided because of following reasons :

i)The overuse of the pesticides are very harmful for plants health , the consumption of pesticides by plants also effect the organisms body depending on plants.

ii)It decrease the fertility of the soil.

Hopefully it was helpfull!!

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Answer 2

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A》Excess water supply can damage crops

➨Excessive water supply can reduce air in the soil space and can cause water logging. This can damage the plant roots and can cause them to die.

B》Grains are not stored without surfeiting

➨Harvested food grains often contain more moisture than is suitable for their storage. Hence, these grains are sun - dried before storing. This prevents growth of microbes on them.

C》Overuse of pesticides should be avoided.

➨Pesticides stick to fruits and vegetables, and are also absorbed by plants. They can, therefore, become a part of the food chain. It is for this reason that the use of pesticides must be kept to the bare minimum.