Page 32 - Introduction to Agriculture by: Aqleem Abbas
P. 32

Introduction to Agriculture         Notes prepared by: Aqleem Abbas


                       Spray of fertilizers on the leaves of crops
                       Root dipping
                       The treatment of liquid fertilizers with the roots of crops  e.g. in rice treatment witn zinc sulphate
                       solution.
                       Seed priming
                       Treatment of crop seeds with nutrient solution for sometime before planting.


                                                               Fertilizer requirement kg per hectare
                                      nitrogen              Phosphorous           Potassium
               Wheat irrigated        135                   60                    60
               Wheat barani           80                    40                    40

               Rice basmati fine      100                   60                    60
               Rice coarse            140                   60                    60
               Maize                  120                   60                    60
               Cotton                 120                   60                    60
               Tobacco                35                    70                    70
               Sugar cane             170                   70                    160
               Sugar beet             90                    100                   60
               Pulses                 25                    60                    0




                                             Classification on the basis of life cycle or crop duration.

               On the basis of their duration or life cycle crops are divided into three groups;

               Annual crops

               These crops which complete their vegetative as well as reproductive stage in one growing season (year)
               and produce flower and seed.

               For example wheat, maize, and barley.

               Biennial crops

               Those crops which complete vegetative growth in first year and reserve food in roots or other plant parts
               during second year the reserved food is utilized to produce flowers and fruits. E.g. sugar beet, radish,
               carrot, and turnip. However these crops are usually harvested during first year to obtain commercial
               products.

               Perennial crops


               These crops grow for more than two years. They may produce seed each year but their life span is for
               more than two years. These crops have the regenerative power to resprout from the stubble after cutting.
               E.g. sugar cane and alfalfa.
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