Page 33 - Introduction to Agriculture by: Aqleem Abbas
P. 33

Introduction to Agriculture         Notes prepared by: Aqleem Abbas


                                         Classification on the basis of season

               In Pakistan we have four distinct seasons like summer, winter, spring and autumn. However plants are not
               classified according to seasons. Crops classification is based on planting date, water charges and govt
               revenues. Crops are divided into two major seasons

               Kharif crops

               These crops which are planted in the summer months from march to july and harvested in autumn or
               winter are called kharif crops e.g. maize, rice, sorghum, milet.

               Rabi crops

               These crops are planted in winter from October to December and harvested in summer from March to
               may. Examples are wheat, barley, gram and lentil. However crops which deviate from these two
               categories are termed as zaid kharif crops and zaid rabi crops.


               Zaid kharif crops
               These crops which are planted in august –September and harvested in dec-january e.g. toria (brassica
               spp).


               Zaid rabi crops
               These are crops which are planted in February and harvested in May-June is called Zaid rabi crops e.g.
               tobacco


                         Purity analysis and adjusting the seed rate for a specific crops

               Objective of practical

               To investigate the percent composition of seed sample and to identify the main component of seed sample
               that is pure seed, other seed, inert material and also to calculate the adjusted seed rate for a particular crop
               variety.

               Pure seed

               Those seeds which dominate the seed sample a lot. It includes 1. Immature 2. Undersize 3. Shrivel 4.
               Germinated. Pure seed belong to a particular variety.

               Other seeds

               We will take all those seeds other than pure seed or all those seeds which donot belong to pure seeds.

               Inert materials

               All those materials or matter which is neither pure seed nor other seeds.
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