Notes ch. 1

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CBSE Class:08  Science Revision Notes Chapter – 1 Crop Production and Management In order to provide food for a large population - regular production, proper management and distribution of food is necessary.  Crop : When plants of the same kind are grown and cultivated at one place on a large scale, it is called a crop. In India, crops can be broadly categorised into two types based on seasons - Rabi and Kharif crops.Sowing of seeds at appropriate depths and distances gives good yield. Good variety of seeds are sown after selection of healthy seeds.  Sowing is done by seed drills.Soil needs replenishment and enrichment through the use of organic manure and fertilisers. Use of chemical fertilisers has increased tremendously with the introduction of new crop varieties.  Basic practices of crop production: (i)  Preparation of Soil: One of the most important tasks in agriculture is to turn the soil and loosen it.The process of loosening and turning of the soil is called tilling or ploughing.  (ii) Sowing:  Sowing of seeds at appropriate depths and distances gives good yield. Good variety of seeds is sown after selection of healthy seeds. Sowing is done by seed drills. (iii) Adding Manure and Fertilisers  Soil needs replenishment and enrichment through the use of organic manure and fertilisers. Use of chemical fertilisers has increased tremendously with the introduction of new crop varieties. Fertiliser: The inorganic compounds containing nutrients such as nitrogen, potassium and phosphorus. They are made in the factories. Example: Urea, ammonium sulphate, potash, etc. Manure: A natural substance prepared from decomposition of plant and animal wastes (cow dung, animal bones, dead leaves, dead insects and vegetable wastes) by the action of microbes. (iv)  Irrigation :  Supply of water to crops at appropriate intervals is called irrigation.                 Method of Irrigation:                  (a) Tradition methods of Irrigation: Moat, Chain pump, Dheki, Rahat.                  (b) Modern methods of Irrigation: Sprinkler system, Drip system.          (v) Protection from Weeds:  Weeding involves removal of unwanted and uncultivated         plants called weeds.         (vi) Harvesting:  Harvesting is the cutting of the mature crop manually or by machines.         (vii) Storage Proper storage of grains is necessary to protect them from pests and      microorganisms.Harvested food grains normally contain more moisture than required for      storage. Large scale of storage of grains is done in silos and granaries to protect them from  pest like rats and insects. Farmers store grains in jute bags or metallic bins. Food is also obtained  from animals for which animals are reared. This is called animal husbandry.

In order to provide food for a large population – regular production, proper management and distribution of food is necessary.

 Crop: When plants of the same kind are grown and cultivated at one place on a large scale, it is called a crop.

• In India, crops can be broadly categorised into two types based on seasons – Rabi and Kharif crops.
• Sowing of seeds at appropriate depths and distances gives good yield. Good variety of seeds are sown after selection of healthy seeds.  Sowing is done by seed drills.
• Soil needs replenishment and enrichment through the use of organic manure and fertilisers. Use of chemical fertilisers has increased tremendously with the introduction of new crop varieties.

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