Page 29 - Introduction to Agriculture by: Aqleem Abbas
P. 29

Introduction to Agriculture         Notes prepared by: Aqleem Abbas


               Secondary nutrients
               Ca, Mg, S


               Are secondary nutrients these are present in soil to some extent. Therefore these nutrients are called
               secondary nutrients.

               Nitrogen


               Nitrogen is most important in all over the world

               Cell division and cell enlargement

               Important for vegetative growth.

               Present in enzymes and proteins.

               It is important for the protoplasm formation.

               Nitrogen Is important for plumbness of seeds

               Chlorophyll formation

               Greenery of plants depends on nitrogen.

               Deficiency symptoms of nitrogen

               Leaves of plant become yellow due to deficiency of nitrogen. This process is called chlorosis.

               Cell development and cell enlargement stops than plant has stunted growth.

               Deficiency of nitrogen causes decrease in no of tillers and inflorescence and also decrease in protein.
               Similarly quality of sed.

               Excess of nitrogen

               When nitrogen increases than the optimum will delay crop maturity.

               Excess of nitrogen will increase plant height. It will cause lodging.

               Excess of nitrogen in fiber crops decrease the fiber quality.

               Excess of nitrogen in fodder crops is toxic to animals. Excess of nitrates cause cancer.


               Excess of nitrogen is not economical to the farmers.

               Excess of nitrogen increases impurities in sugar.

               Phosphorous

               Phosphorous is second most important nutrients after nitrogen. It is component of energy rich
               compounds. Phosphorous is also component of RNA and DNA. Phosphorous application to crops can
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