Maharashtra HSC Crop Science (Vocational) cheat sheet

Crop science integrates agronomy, horticulture, plant breeding, soil science and plant protection to manage field crops for yield and quality.

Classification by life cycle: annual (completes one season, e.g. rice, maize, soybean), biennial (two seasons, e.g. sugar beet, cabbage), perennial (three or more years, e.g. sugarcane, banana, mango).

Classification by season in Maharashtra: kharif (sown June-July with monsoon, e.g. cotton, sorghum, paddy), rabi (October-November, e.g. wheat, gram, safflower), summer/zaid (January-February, e.g. groundnut, vegetables, fodder).

Botanical classification uses family, genus and species; cereal crops belong to Poaceae, pulses to Fabaceae, solanaceous vegetables to Solanaceae.

Agronomic grouping: cereals (rice, wheat, sorghum), pulses (gram, tur, mung), oilseeds (groundnut, sunflower, safflower), fibre (cotton, jute), sugar (sugarcane), fodder, and plantation crops.

Economic classification by use: food crops, cash crops, fodder crops, industrial crops, medicinal and aromatic crops.

Photosynthetic classification: C3 crops (rice, wheat, soybean) show photorespiration; C4 crops (maize, sorghum, sugarcane) have Kranz anatomy and higher water-use efficiency.

Root system classification: tap-rooted dicots (cotton, gram) versus fibrous-rooted monocots (cereals); root depth affects drought tolerance and irrigation scheduling.

Crop duration classes: short duration (less than 100 days), medium (100-140 days), long (over 140 days); duration determines cropping intensity and rotation choice.

Soil texture classes follow the percentage of sand, silt and clay; loam is the most desirable for crop production because it balances drainage, aeration and water holding.

Soil structure refers to aggregation of particles; granular and crumb structure favour root growth, while platy or massive structure restricts infiltration.

Bulk density = oven-dry soil mass / total volume; higher bulk density indicates compaction and reduced porosity.

Particle density of mineral soils is near 2.65 g/cm3; porosity (%) = (1 - bulk density/particle density) x 100.

Soil pH classes: strongly acidic below 5.5, acidic 5.5-6.5, neutral 6.5-7.5, alkaline 7.5-8.5, sodic above 8.5; nutrient availability is widest between pH 6.0 and 7.5.

Cation exchange capacity (CEC) is measured in cmol(p+)/kg; clay and organic matter raise CEC, improving nutrient retention.

Base saturation = (exchangeable bases / CEC) x 100; soils with high base saturation are generally fertile and less acidic.

Soil organic carbon improves aggregation, water retention and microbial activity; it is the key indicator of soil health in fertility management.

Essential soil testing steps: representative sampling with auger to 15-30 cm depth, quartering to reduce sample, air drying, laboratory analysis and fertilizer recommendation.

Essential elements: 17 in total; macronutrients (N, P, K, Ca, Mg, S) required in large amounts, micronutrients (Fe, Mn, Zn, Cu, B, Mo, Cl, Ni) in small amounts.

Criteria of essentiality: the element is necessary for completion of the plant life cycle, its deficiency is correctable only by that element, and it acts directly in plant metabolism.

Nitrogen is a constituent of proteins, chlorophyll and enzymes; deficiency shows as uniform yellowing of older leaves.

Phosphorus is involved in energy transfer (ATP), nucleic acids and root development; deficiency causes purple or reddish discoloration and stunted growth.

Potassium regulates stomatal movement, enzyme activation and water relations; deficiency shows marginal scorching of older leaves.

Calcium and boron are immobile in the phloem; deficiency symptoms appear first on young leaves and growing points.

Mobile nutrients (N, P, K, Mg) show deficiency symptoms first on older leaves because they are translocated to new growth.

Zinc deficiency causes khaira in paddy and white bud in maize; boron deficiency causes hollow heart in cauliflower and brown heart in beet.

Law of the minimum: growth is limited by the nutrient in shortest supply relative to requirement, not by total nutrient abundance.

Fertilizer grade N-P2O5-K2O expresses nutrient content as percentage by weight; urea is 46-0-0, DAP is 18-46-0, MOP is 0-0-60, SSP is 0-16-0.

Nutrient quantity from a fertilizer = weight of fertilizer x grade percentage / 100; for 100 kg urea, N = 100 x 46/100 = 46 kg.

Farmyard manure (FYM) supplies about 0.5% N, 0.2% P2O5 and 0.5% K2O; it is a bulky organic manure applied before sowing.

Green manure crops (e.g. sunhemp, dhaincha) are grown and ploughed in situ to add organic matter and nitrogen.

Compost is decomposed organic waste; vermicompost is produced by earthworm action and is richer in available nutrients and humus.

Biofertilizers: Rhizobium for legumes, Azotobacter and Azospirillum for non-legumes, phosphate-solubilizing bacteria for P availability, mycorrhiza for P uptake.

Nitrogen fertilizers: urea (46% N), ammonium sulphate (20.6% N), calcium ammonium nitrate; phosphorus: SSP, DAP, rock phosphate; potassium: MOP, SOP.

Split application of nitrogen matches crop demand and reduces leaching loss; basal dose plus top dressing at critical growth stages is standard practice.

Integrated nutrient management combines organic manure, chemical fertilizer and biofertilizer to sustain soil fertility and reduce dependence on inorganic sources.

Tillage operations: primary tillage (ploughing) breaks soil, secondary tillage (harrowing, cultivator) prepares seedbed; minimum tillage reduces soil disturbance and erosion.

Seed rate is the quantity of seed required per hectare; it depends on test weight, germination percentage and desired plant population.

Plant population per hectare = (area x 10,000) / (row spacing in m x plant spacing in m).

Sowing methods: broadcasting, drilling, dibbling, transplanting and ridge-furrow; line sowing enables uniform depth and easier intercultivation.

Spacing affects light interception and yield; closer spacing increases plant number but may reduce individual plant yield.

Intercropping grows two or more crops together in the same field; it improves land equivalent ratio and reduces risk.

Crop rotation with legumes fixes atmospheric nitrogen and breaks pest and disease cycles.

Weeding, thinning, gap filling and earthing up are critical intercultural operations that protect yield.

Harvesting at physiological maturity and proper threshing and winnowing reduce grain loss and maintain quality.

Irrigation water requirement = crop evapotranspiration (ETc) minus effective rainfall; ETc = reference evapotranspiration (ETo) x crop coefficient (Kc).

Critical stages for irrigation: paddy (tillering, panicle initiation, flowering), wheat (crown root initiation, flowering, milk stage), cotton (squaring, flowering, boll development).

Surface irrigation methods: basin, border, furrow and check basin; sprinkler and drip are pressurized methods with higher application efficiency.

Drip irrigation applies water near the root zone and can achieve 85-95% application efficiency; sprinkler efficiency is typically 70-80%.

Water use efficiency (WUE) = crop yield / water consumed; measured in kg per hectare per mm of water.

Drainage removes excess water; surface drainage uses open channels, subsurface drainage uses buried pipes or tiles to lower the water table.

Waterlogging reduces oxygen in the root zone and causes yellowing, root rot and yield loss; raised beds and drainage channels mitigate it.

Irrigation scheduling by soil moisture depletion or pan evaporation avoids both under- and over-irrigation.

Weed classification: annual, biennial and perennial; also narrow-leaved (grasses) versus broad-leaved weeds; sedges are a separate group.

Weed control methods: mechanical (hand weeding, hoeing), cultural (crop rotation, stale seedbed), biological and chemical (herbicides).

Herbicide selectivity depends on crop and weed species, dose, stage and formulation; incorrect dose causes crop injury or poor control.

Integrated pest management (IPM) combines cultural, mechanical, biological and chemical measures, with chemical control as the last resort.

Economic threshold level (ETL) is the pest population at which control measures are economically justified.

Insect pest groups: chewing (caterpillars, beetles) and sucking (aphids, jassids, whiteflies); sucking pests are often vectors of viral diseases.

Disease triangle: a disease develops when a susceptible host, virulent pathogen and favourable environment coincide.

Fungicides are protectant (applied before infection) or systemic (absorbed into plant tissue); correct timing and coverage determine efficacy.

Pesticide label information includes active ingredient, formulation, dose, waiting period and safety precautions; the waiting period must be observed before harvest.

Tillage implements: mouldboard plough (inversion and burial of residues), disc plough, cultivator, harrow and rotavator (powered tillage).

Sowing implements: seed drill, seed-cum-fertilizer drill, dibbler and planter; calibrated before sowing to deliver the correct seed rate.

Sprayers: knapsack, foot sprayer and power sprayer; nozzle type (flat fan, hollow cone) determines droplet size and coverage.

Tractor power is rated in horsepower (hp); PTO (power take-off) drives implements such as rotavator, thresher and sprayer pumps.

Field capacity = area covered per unit time; it depends on implement width and forward speed.

Harvesting machinery: reaper, combine harvester and thresher; combine harvests and threshes in one operation.

Maintenance of farm tools includes cleaning after use, oiling metal parts and sharpening cutting edges to prolong service life.

Safety: use guards on PTO shafts, keep hands clear of moving parts and wear protective gear while handling machinery and chemicals.

Seed quality parameters: purity, germination percentage, moisture content, vigour and freedom from weed seeds and pests.

Germination percentage = (number of normal seedlings / total seeds tested) x 100.

Seed testing is done in a seed testing laboratory; results determine the seed rate and certification acceptance.

Seed treatment: fungicide (against seed-borne fungi), insecticide (against storage pests) and biofertilizer or bioagent coatings.

Seed certification involves field inspection, seed testing and issuing a certification tag; certified seed meets prescribed standards.

Seed classes: breeder seed, foundation seed, registered seed and certified seed, each with defined generation and purity.

Seed storage requires dry, cool conditions; moisture content above safe limits (about 12% for cereals) causes heating, mould and loss of viability.

Vegetative planting material: setts (sugarcane), tubers (potato), rhizomes (ginger, turmeric), cuttings and grafts; selected from healthy, true-to-type plants.

Post-harvest losses arise from harvesting injury, poor drying, inadequate storage, pests and handling; proper drying to safe moisture is the first defence.

Grain drying to safe moisture (about 12-14% for cereals, lower for oilseeds) prevents mould and insect infestation.

Storage structures: mud bin, metal bin, gunny bags, silos and cold storage; hermetic storage limits insect and oxygen damage.

Fumigation with approved fumigants controls storage insects; the store must be sealed and safety precautions followed.

Grading and sorting remove damaged, immature and foreign material, improving market value and uniformity.

Value addition through cleaning, grading, packaging and processing raises the price realised by the producer.

Marketing channels: producer to local trader, commission agent, regulated market (APMC), cooperative and direct-to-consumer sales.

Market information (prices, arrivals, demand) helps farmers choose timing and channel; e-NAM and similar platforms enable electronic trading.

Farm management decisions involve planning, organising, directing and controlling resources: land, labour, capital and management.

Gross income = yield x price; net income = gross income - total cost of production.

Cost of cultivation includes variable costs (seed, fertilizer, labour, irrigation, plant protection) and fixed costs (land revenue, depreciation, interest).

Benefit-cost ratio = gross income / total cost; a ratio above 1 indicates a profitable enterprise.

Break-even point is the output level at which total revenue equals total cost; it guides minimum production targets.

Farm records (cash book, labour register, input-output records) support planning, credit access and enterprise analysis.

Entrepreneurship skills: opportunity identification, business planning, risk management, marketing and financial literacy.

Occupational safety: use protective clothing, gloves, goggles and masks when handling pesticides; avoid eating or smoking in the field.

First aid for pesticide exposure: remove contaminated clothing, wash skin with soap and water, and seek medical help immediately with the label.

Crop science integrates agronomy, horticulture, plant breeding, soil science and plant protection to manage field crops for yield and quality.

Classification by life cycle: annual (completes one season, e.g. rice, maize, soybean), biennial (two seasons, e.g. sugar beet, cabbage), perennial (three or more years, e.g. sugarcane, banana, mango).

Classification by season in Maharashtra: kharif (sown June-July with monsoon, e.g. cotton, sorghum, paddy), rabi (October-November, e.g. wheat, gram, safflower), summer/zaid (January-February, e.g. groundnut, vegetables, fodder).

Botanical classification uses family, genus and species; cereal crops belong to Poaceae, pulses to Fabaceae, solanaceous vegetables to Solanaceae.

Agronomic grouping: cereals (rice, wheat, sorghum), pulses (gram, tur, mung), oilseeds (groundnut, sunflower, safflower), fibre (cotton, jute), sugar (sugarcane), fodder, and plantation crops.

Economic classification by use: food crops, cash crops, fodder crops, industrial crops, medicinal and aromatic crops.

Photosynthetic classification: C3 crops (rice, wheat, soybean) show photorespiration; C4 crops (maize, sorghum, sugarcane) have Kranz anatomy and higher water-use efficiency.

Root system classification: tap-rooted dicots (cotton, gram) versus fibrous-rooted monocots (cereals); root depth affects drought tolerance and irrigation scheduling.

Crop duration classes: short duration (less than 100 days), medium (100-140 days), long (over 140 days); duration determines cropping intensity and rotation choice.

Soil texture classes follow the percentage of sand, silt and clay; loam is the most desirable for crop production because it balances drainage, aeration and water holding.

Soil structure refers to aggregation of particles; granular and crumb structure favour root growth, while platy or massive structure restricts infiltration.

Bulk density = oven-dry soil mass / total volume; higher bulk density indicates compaction and reduced porosity.

Particle density of mineral soils is near 2.65 g/cm3; porosity (%) = (1 - bulk density/particle density) x 100.

Soil pH classes: strongly acidic below 5.5, acidic 5.5-6.5, neutral 6.5-7.5, alkaline 7.5-8.5, sodic above 8.5; nutrient availability is widest between pH 6.0 and 7.5.

Cation exchange capacity (CEC) is measured in cmol(p+)/kg; clay and organic matter raise CEC, improving nutrient retention.

Base saturation = (exchangeable bases / CEC) x 100; soils with high base saturation are generally fertile and less acidic.

Soil organic carbon improves aggregation, water retention and microbial activity; it is the key indicator of soil health in fertility management.

Essential soil testing steps: representative sampling with auger to 15-30 cm depth, quartering to reduce sample, air drying, laboratory analysis and fertilizer recommendation.

Essential elements: 17 in total; macronutrients (N, P, K, Ca, Mg, S) required in large amounts, micronutrients (Fe, Mn, Zn, Cu, B, Mo, Cl, Ni) in small amounts.

Criteria of essentiality: the element is necessary for completion of the plant life cycle, its deficiency is correctable only by that element, and it acts directly in plant metabolism.

Nitrogen is a constituent of proteins, chlorophyll and enzymes; deficiency shows as uniform yellowing of older leaves.

Phosphorus is involved in energy transfer (ATP), nucleic acids and root development; deficiency causes purple or reddish discoloration and stunted growth.

Potassium regulates stomatal movement, enzyme activation and water relations; deficiency shows marginal scorching of older leaves.

Calcium and boron are immobile in the phloem; deficiency symptoms appear first on young leaves and growing points.

Mobile nutrients (N, P, K, Mg) show deficiency symptoms first on older leaves because they are translocated to new growth.

Zinc deficiency causes khaira in paddy and white bud in maize; boron deficiency causes hollow heart in cauliflower and brown heart in beet.

Law of the minimum: growth is limited by the nutrient in shortest supply relative to requirement, not by total nutrient abundance.

Fertilizer grade N-P2O5-K2O expresses nutrient content as percentage by weight; urea is 46-0-0, DAP is 18-46-0, MOP is 0-0-60, SSP is 0-16-0.

Nutrient quantity from a fertilizer = weight of fertilizer x grade percentage / 100; for 100 kg urea, N = 100 x 46/100 = 46 kg.

Farmyard manure (FYM) supplies about 0.5% N, 0.2% P2O5 and 0.5% K2O; it is a bulky organic manure applied before sowing.

Green manure crops (e.g. sunhemp, dhaincha) are grown and ploughed in situ to add organic matter and nitrogen.

Compost is decomposed organic waste; vermicompost is produced by earthworm action and is richer in available nutrients and humus.

Biofertilizers: Rhizobium for legumes, Azotobacter and Azospirillum for non-legumes, phosphate-solubilizing bacteria for P availability, mycorrhiza for P uptake.

Nitrogen fertilizers: urea (46% N), ammonium sulphate (20.6% N), calcium ammonium nitrate; phosphorus: SSP, DAP, rock phosphate; potassium: MOP, SOP.

Split application of nitrogen matches crop demand and reduces leaching loss; basal dose plus top dressing at critical growth stages is standard practice.

Integrated nutrient management combines organic manure, chemical fertilizer and biofertilizer to sustain soil fertility and reduce dependence on inorganic sources.

Tillage operations: primary tillage (ploughing) breaks soil, secondary tillage (harrowing, cultivator) prepares seedbed; minimum tillage reduces soil disturbance and erosion.

Seed rate is the quantity of seed required per hectare; it depends on test weight, germination percentage and desired plant population.

Plant population per hectare = (area x 10,000) / (row spacing in m x plant spacing in m).

Sowing methods: broadcasting, drilling, dibbling, transplanting and ridge-furrow; line sowing enables uniform depth and easier intercultivation.

Spacing affects light interception and yield; closer spacing increases plant number but may reduce individual plant yield.

Intercropping grows two or more crops together in the same field; it improves land equivalent ratio and reduces risk.

Crop rotation with legumes fixes atmospheric nitrogen and breaks pest and disease cycles.

Weeding, thinning, gap filling and earthing up are critical intercultural operations that protect yield.

Harvesting at physiological maturity and proper threshing and winnowing reduce grain loss and maintain quality.

Irrigation water requirement = crop evapotranspiration (ETc) minus effective rainfall; ETc = reference evapotranspiration (ETo) x crop coefficient (Kc).

Critical stages for irrigation: paddy (tillering, panicle initiation, flowering), wheat (crown root initiation, flowering, milk stage), cotton (squaring, flowering, boll development).

Surface irrigation methods: basin, border, furrow and check basin; sprinkler and drip are pressurized methods with higher application efficiency.

Drip irrigation applies water near the root zone and can achieve 85-95% application efficiency; sprinkler efficiency is typically 70-80%.

Water use efficiency (WUE) = crop yield / water consumed; measured in kg per hectare per mm of water.

Drainage removes excess water; surface drainage uses open channels, subsurface drainage uses buried pipes or tiles to lower the water table.

Waterlogging reduces oxygen in the root zone and causes yellowing, root rot and yield loss; raised beds and drainage channels mitigate it.

Irrigation scheduling by soil moisture depletion or pan evaporation avoids both under- and over-irrigation.

Weed classification: annual, biennial and perennial; also narrow-leaved (grasses) versus broad-leaved weeds; sedges are a separate group.

Weed control methods: mechanical (hand weeding, hoeing), cultural (crop rotation, stale seedbed), biological and chemical (herbicides).

Herbicide selectivity depends on crop and weed species, dose, stage and formulation; incorrect dose causes crop injury or poor control.

Integrated pest management (IPM) combines cultural, mechanical, biological and chemical measures, with chemical control as the last resort.

Economic threshold level (ETL) is the pest population at which control measures are economically justified.

Insect pest groups: chewing (caterpillars, beetles) and sucking (aphids, jassids, whiteflies); sucking pests are often vectors of viral diseases.

Disease triangle: a disease develops when a susceptible host, virulent pathogen and favourable environment coincide.

Fungicides are protectant (applied before infection) or systemic (absorbed into plant tissue); correct timing and coverage determine efficacy.

Pesticide label information includes active ingredient, formulation, dose, waiting period and safety precautions; the waiting period must be observed before harvest.

Tillage implements: mouldboard plough (inversion and burial of residues), disc plough, cultivator, harrow and rotavator (powered tillage).

Sowing implements: seed drill, seed-cum-fertilizer drill, dibbler and planter; calibrated before sowing to deliver the correct seed rate.

Sprayers: knapsack, foot sprayer and power sprayer; nozzle type (flat fan, hollow cone) determines droplet size and coverage.

Tractor power is rated in horsepower (hp); PTO (power take-off) drives implements such as rotavator, thresher and sprayer pumps.

Field capacity = area covered per unit time; it depends on implement width and forward speed.

Harvesting machinery: reaper, combine harvester and thresher; combine harvests and threshes in one operation.

Maintenance of farm tools includes cleaning after use, oiling metal parts and sharpening cutting edges to prolong service life.

Safety: use guards on PTO shafts, keep hands clear of moving parts and wear protective gear while handling machinery and chemicals.

Seed quality parameters: purity, germination percentage, moisture content, vigour and freedom from weed seeds and pests.

Germination percentage = (number of normal seedlings / total seeds tested) x 100.

Seed testing is done in a seed testing laboratory; results determine the seed rate and certification acceptance.

Seed treatment: fungicide (against seed-borne fungi), insecticide (against storage pests) and biofertilizer or bioagent coatings.

Seed certification involves field inspection, seed testing and issuing a certification tag; certified seed meets prescribed standards.

Seed classes: breeder seed, foundation seed, registered seed and certified seed, each with defined generation and purity.

Seed storage requires dry, cool conditions; moisture content above safe limits (about 12% for cereals) causes heating, mould and loss of viability.

Vegetative planting material: setts (sugarcane), tubers (potato), rhizomes (ginger, turmeric), cuttings and grafts; selected from healthy, true-to-type plants.

Post-harvest losses arise from harvesting injury, poor drying, inadequate storage, pests and handling; proper drying to safe moisture is the first defence.

Grain drying to safe moisture (about 12-14% for cereals, lower for oilseeds) prevents mould and insect infestation.

Storage structures: mud bin, metal bin, gunny bags, silos and cold storage; hermetic storage limits insect and oxygen damage.

Fumigation with approved fumigants controls storage insects; the store must be sealed and safety precautions followed.

Grading and sorting remove damaged, immature and foreign material, improving market value and uniformity.

Value addition through cleaning, grading, packaging and processing raises the price realised by the producer.

Marketing channels: producer to local trader, commission agent, regulated market (APMC), cooperative and direct-to-consumer sales.

Market information (prices, arrivals, demand) helps farmers choose timing and channel; e-NAM and similar platforms enable electronic trading.

Farm management decisions involve planning, organising, directing and controlling resources: land, labour, capital and management.

Gross income = yield x price; net income = gross income - total cost of production.

Cost of cultivation includes variable costs (seed, fertilizer, labour, irrigation, plant protection) and fixed costs (land revenue, depreciation, interest).

Benefit-cost ratio = gross income / total cost; a ratio above 1 indicates a profitable enterprise.

Break-even point is the output level at which total revenue equals total cost; it guides minimum production targets.

Farm records (cash book, labour register, input-output records) support planning, credit access and enterprise analysis.

Entrepreneurship skills: opportunity identification, business planning, risk management, marketing and financial literacy.

Occupational safety: use protective clothing, gloves, goggles and masks when handling pesticides; avoid eating or smoking in the field.

First aid for pesticide exposure: remove contaminated clothing, wash skin with soap and water, and seek medical help immediately with the label.