Page 28 - Introduction to Agriculture by: Aqleem Abbas
P. 28

Introduction to Agriculture         Notes prepared by: Aqleem Abbas


               Quadruple cropping

               Crop rotation

               A crop rotation is growing crops in a regular sequence one after the other on the same land keeping in
               mind that soil fertility may not be adversely affected

               E.g. sugarcane than legume crops.


               Ratooning

               After the harvest of sugar cane under ground portion of crop is left in the soil to sprout another crop of
               sugar cane. Sugar cane is vegetatively grown in Pakistan. Research show that sugar percent is greater than
               fresh one.


                                                 CROP NUTRITION


               A process by which plants take in and utilize food substances is called crop nutrition.

               Ingestion

               Taking in of food nutrients (inorganic substances from the soil by roots.

               Digestion

               When these inorganic substance are being converted into organic form.

               Assimilation

               When these organic material is used by plants to obtain energy. Energy is used for growth and
               development. Growth is increase in size while development in which leaves, stem and nodes arises.
               Sixteen nutrients are essential. The crops are unable to complete its life cycle in the absence of essential
               nutrients if the nutrients are deficient or absent plant cannot grow properly. The function of one essential
               nutrient is not replaced by another nutrient. Nutrients are involved in plant metabolism nutrients must be
               involved in plant metabolism.



               Macro nutrients

               Primary nutrients

               C, H, O

               Plant gets carbon from air while H and O from water.


               N, P, K
               These are primary nutrients are required by plant in more quantity. Therefore we called this nutrients
               primary.
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