Try Now for FREE
- 1. Select your country from the
dropdown. - 2. Mobile : Enter just the mobile no. without any codes
- 3. Landline : Enter the
STD code followed by the phone no. Example 040-66979999.
CBSE - IX
Improvement of Crop Resources
Improvement in Crop Resources
The green revolution contributed to increased food-grain production, and the white revolution contributed to increased availability of milk. Sources of Nutrition include cereals, pulses, oil seeds, vegetables, spices and fruits. Kharif crops are grown in the rainy season, which is from June to October. Rabi crops are grown in the winter season from November to April. Desirable traits are incorporated into the plant by hybridisation. Genetic modification in plants produced plants that are able to survive in a drought and water logged conditions. Macronutrients includes nitrogen, phosphorous, potassium, calcium, magnesium, and sulphur. Micronutrients includes iron, manganese, boron, zinc, copper, molybdenum and chlorine. Manure increases soil fertility. Types of manure includes compost, vermi-compost and green manure. Fertilizers supply nitrogen, phosphorus and potassium to the plants.
Blue green algae are used as biofertilizers and neem leaves or turmeric are used as biopesticides. Irrigation is the artificial supply of water to the soil by means such as wells, canals, rivers and tanks. Types of wells include dug well and tube well. When canal flow is insufficient due to inadequate reservoir release, river lift systems are used. Rainwater harvesting increases the ground water levels and reduce soil erosion. Cropping patterns –Types: mixed cropping, inter cropping and crop rotation. Nurturing crop plants against the damages caused by weeds, pests and diseases is crop protection management. Diseases in plants are caused by pests, bacteria, fungi and viruses and can be controlled by spraying pesticides, insecticides and fungicides. Exposure to chemical fumes kills pests, called fumigation.
