Page 31 - Introduction to Agriculture by: Aqleem Abbas
P. 31

Introduction to Agriculture         Notes prepared by: Aqleem Abbas


                   4.  Field experiments

               Types of fertilizer

                       Straight or simple fertilizers
                       A fertilizer which contain only one essential nutrient. It is called straight fertilizer.
                       E.g. urea, SSP, and TSP
                       Compound fertilizer
                       A fertilizer which contain more than one essential nutrients is called compound fertilizer or
                       complex or called mixed fertilizer.
                       E.g. DAP, NP
                       Complete fertilizer
                       a fertilizer which contains all the three major nutrients is called complete fertilizer.
                       NPK = 15; 15; 15
                       But according to some scientist a fertilizer that contains all essential nutrients.
                                                    Methods of fertilizer application

                       Fertilizers are available in solid and liquid form so their method of application is different from
                       each other
                       Solid fertilizer
                       Standing crops
                       Basal dose
                       Basal dose
                       The fertilizer which is applied to crops in sowing time is called basal dose.
                       Broadcasting
                       Band application
                       Broadcasting
                       On  the surface of soil uniformly by hand or by a machine
                       Band application
                       Application of fertilizer along the rows by drill or hand hoe machine.
                       Standing crops
                       Only the nitrogen or urea is used for standing crops.
                       For standing crops fertilizers are being used by following tow methods’
                       Top dressing
                       Fertilizers are used by hands or air crafts .
                       Side dressing
                       Along the rows by using hands or machines.
                       Liquid fertilizer
                       Liquid fertilizer is also applied in liquid form in advance countries. Fertilizer are applied in liquid
                       form.
                       Direct application
                       Injection of fertilizer to the field or soil by special planters.
                       Fertigation
                       Application of fertilizers along with irrigated water  .
                       Foliar application
   26   27   28   29   30   31   32   33   34   35   36