Introduction to Crop Science and Crop Classification
What this domain tests
Questions here check whether you can define a crop and place any Maharashtra crop into the right class by season, use, life cycle, root system, photosynthetic pathway and soil-nutrient behaviour. Expect short definitions plus applied classification of crops such as soybean, jowar, sugarcane, tur and cotton.
Core rules
- Seasonal classes: kharif (sown June–July on monsoon rain - cotton, soybean, tur, paddy, kharif jowar, bajra); rabi (sown October–November on stored moisture and cool weather - wheat, gram, safflower, rabi jowar, linseed); summer/zaid (sown January–February - summer paddy, summer groundnut, vegetables).
- Use classes: cereal, millet, pulse, oilseed, fibre, sugar, condiment, fodder, tuber and horticultural crops. One crop can carry two labels - soybean is an oilseed and a pulse.
- Life cycle: annual, biennial, perennial. Sugarcane is perennial in habit but grown as a seasonal crop with a 12–18 month duration.
- Nutrient behaviour: exhaustive crops (cereals, cotton, sugarcane) remove large nutrient amounts; restorative legumes (tur, gram, groundnut, soybean) fix nitrogen through Rhizobium and improve soil.
- C3 versus C4: wheat, cotton, soybean and tur are C3; maize, jowar, bajra and sugarcane are C4, photosynthesising efficiently at high temperature and light.
Worked example
Classify soybean. Reasoning: sown with the monsoon, so kharif; harvested for oil and cake, so oilseed; but it is also a grain legume, so pulse; completes in one season, so annual; dicotyledonous with a tap root; C3 plant; nodulates with Bradyrhizobium, so restorative. Conclusion: kharif oilseed-cum-pulse, annual, C3, restorative - a sound preceding crop before rabi wheat or gram.
Traps that cost marks
Calling every sold crop a "cash crop" (the term means a crop grown mainly for sale, not a botanical class); forgetting that jowar is both a kharif and a rabi crop; labelling groundnut a cereal or a nut; and mixing C3/C4 with monocot/dicot.