Question

how much water did gram need ​

Answer 1

Answer:

Crops need water for transpiration and evaporation (see Volume 1, Section 4.2).

The plant roots suck or extract water from the soil to live and grow. The main part of this water does not remain in the plant, but escapes to the atmosphere as vapour through the plant's leaves and stem. This process is called transpiration. Transpiration happens mainly during the day time.

Water from an open water surface escapes as vapour to the atmosphere during the day. The same happens to water on the soil surface and to water on the leaves and stem of a plant. This process is called evaporation (Fig. 4).

The water need of a crop thus consists of transpiration plus evaporation. Therefore, the crop water need is also called "evapotranspi

ration".

Answer 2

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The number of litres you should be drinking per day. So, if you weigh 60 kilos for example, you should drink 2 litres of water a day, whereas if you weigh 80 kilos, you should drink 2.6 litres (2 litres and 600 ml) of water per day.