Page 33 - Introduction to Agriculture by: Aqleem Abbas

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.