Crop Rotation
- In this pattern, different crops are grown on the same land in preplanned succession. The crops are classified as one-year rotation, two-year rotation, and three-year rotation, depending upon their duration.
- Legumes are included in the crop rotation programme to increase soil fertility. The crops which require high fertility level (wheat) can be grown after the legumes. The crops which require low inputs can be grown after the crops that require high inputs.
Selection of crops for Rotation
- While selecting the crops for rotation, the following criteria should be adopted:
- Enough moisture should be available.
- Availability of fertilizers, man-power, and machine-power.
- Marketing and processing facilities.
- Availability of nutrients in the soil.
- The crop duration- short or long.
Advantages of Crop Rotation
- The soil fertility is maintained for a prolonged period.
- The growth of weeds and pests is prevented.
- A lot of chemical fertilizers are not required.
- The physical and chemical nature of the soil remains unaltered.
Circulatory system "Circulation means" anything which moves around. The system that contains the heart and the blood vessels and moves blood throughout the body . This system helps tissues get enough oxygen and nutrients, and it helps them get rid of waste products. Circulatory system is of two types 1. open circulatory system- where there is no blood vessels involved ex- cockroach and 2. closed circulatory system like human being where blood vessels supplies the blood to other organs. This system consists 3 organs 1. blood 2.blood vessels And most important 3. heart Blood vessels are further divided into two parts 1. arteries 2.veins The discovery of blood circulation system was done by William Harvey. Points to remember: Biological term of the heart is ‘Cardio’. Doctor Who study heart is called cardiologist our heart consist four Chambers And is of a size of closed fist Atrium are the upper parts and ventricles are there a lower parts heart. It rema...
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