Sowing Methods for Sorghum

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Questions and Answers

What is a primary disadvantage of the broadcasting method of sowing seeds?

  • It requires minimal seed.
  • The seed distribution is uneven. (correct)
  • It is limited to dry lands only.
  • It is too time-consuming.

Which seed rate is recommended for the drilling method in irrigated lands?

  • 8-12 kg/ha (correct)
  • 10-14 kg/ha
  • 12-15 kg/ha
  • 6-8 kg/ha

In which condition is dibbling considered economically viable?

  • Where there is limited rainfall.
  • When labor is not a constraint. (correct)
  • For higher seed rates in black soil.
  • In irrigated crop fields only.

What is the recommended sowing depth for dibbling?

<p>2.5-5 cm (C)</p> Signup and view all the answers

What is the practice of transplanting jowar seedlings primarily associated with?

<p>Districts that experience heavy rain. (B)</p> Signup and view all the answers

Which method allows for greater spacing of 45x15 cm when sowing?

<p>Dibbling (D)</p> Signup and view all the answers

What is the seed rate for the broadcasting method in dry lands?

<p>12-18 kg/ha (A)</p> Signup and view all the answers

What happens to the seedlings of jowar during the transplanting process?

<p>They are dropped into the furrow and covered. (B)</p> Signup and view all the answers

What is the primary effect of striga on jowar plants?

<p>Depletes nourishment from the roots (B)</p> Signup and view all the answers

Which method is NOT effective in controlling striga?

<p>Harvesting early before maturity (B)</p> Signup and view all the answers

What is the ideal moisture percentage for harvesting jowar grain?

<p>Less than 25% (C)</p> Signup and view all the answers

Which technique aids in reducing moisture content in harvested sorghum?

<p>Winnowing and drying (A)</p> Signup and view all the answers

What could be a consequence of harvesting jowar plants after the flowering stage?

<p>Higher toxicity due to hydrocyanic acid (D)</p> Signup and view all the answers

What is indicated by the term 'exhaustive crop' in relation to sorghum?

<p>It depletes more nutrients from the soil compared to other crops. (A)</p> Signup and view all the answers

What is the recommended timing for the first cutting of multi-cut jowar varieties?

<p>2 months after sowing (A)</p> Signup and view all the answers

Which crop should NOT succeed sorghum due to nutrient depletion concerns?

<p>Cotton (C)</p> Signup and view all the answers

What is the primary advantage of the transplanting method of sowing in hybrid sorghum?

<p>It ensures better synchronisation of male and female lines. (B)</p> Signup and view all the answers

Under which conditions can ratooning of sorghum be successful?

<p>Under irrigated conditions. (B)</p> Signup and view all the answers

What effect does transplanting male lines have on their flowering time?

<p>It delays flowering by about one week. (D)</p> Signup and view all the answers

Which hybrid of sorghum is considered the best for ratooning?

<p>CSH-1 (B)</p> Signup and view all the answers

What is one of the initial steps required for successful ratooning?

<p>Irrigate two days after harvesting. (D)</p> Signup and view all the answers

How many good healthy sprouts should be left in each stubble during ratooning management?

<p>Two to three sprouts (A)</p> Signup and view all the answers

How does ratooning economically benefit farmers compared to traditional planting?

<p>It reduces expenditure on land preparation and sowing. (B)</p> Signup and view all the answers

What is the typical time frame for a ratoon crop to come to harvest?

<p>80-85 days (C)</p> Signup and view all the answers

What is the consequence of severe moisture stress after flowering in kharif jowar?

<p>Blasting and poor head filling (B)</p> Signup and view all the answers

Which of the following weeds is categorized as a sedge associated with sorghum?

<p>Cyperus rotundus (B)</p> Signup and view all the answers

What is the recommended action if mechanical weed management is employed in rainfed jowar?

<p>Use danthi for intercultivation (D)</p> Signup and view all the answers

When should interculturing commence in sorghum cultivation?

<p>When the crop is about 15-20 DAS (B)</p> Signup and view all the answers

What is a key characteristic of Striga lutea?

<p>It is a root parasite that adversely affects sorghum (D)</p> Signup and view all the answers

What is the purpose of applying Atrazine or Propazine in sorghum cultivation?

<p>To control nut grass effectively (B)</p> Signup and view all the answers

How does Striga affect the host sorghum plant?

<p>By robbing it of food and hormones (C)</p> Signup and view all the answers

What is the correct application method for 2,4-D in weed management?

<p>4-5 days after sowing for broad-leaved weeds (D)</p> Signup and view all the answers

What is one method to counteract the toxic effects left by the sorghum crop on succeeding crops?

<p>Good manuring with FYM (D)</p> Signup and view all the answers

Which of the following is a primary yield attribute measured in sorghum cultivation?

<p>Number of panicles per unit area (A)</p> Signup and view all the answers

What is the range of protein content found in sorghum grain?

<p>7.4% - 14.2% (C)</p> Signup and view all the answers

In North India, which crop sequence follows sorghum?

<p>Sorghum - Wheat - Cowpea (A)</p> Signup and view all the answers

Which amino acid is sorghum protein particularly deficient in?

<p>Lysine (D)</p> Signup and view all the answers

What is the approximate yield of irrigated sorghum per hectare?

<p>50-60 q/ha (B)</p> Signup and view all the answers

Which combination is an example of mixed cropping in South India?

<p>Sorghum + Pigeonpea (C)</p> Signup and view all the answers

What is the main mineral deficiency found in sorghum compared to other cereals?

<p>Zinc (C)</p> Signup and view all the answers

Flashcards

Broadcasting (Sorghum Sowing)

A method of sowing sorghum seeds where seeds are scattered randomly over the field, requiring a high seed rate and often resulting in uneven distribution.

Drilling (Sorghum Sowing)

Sowing method where seeds are placed in rows using special machinery, ensuring even distribution and proper depth coverage.

Dibbling (Sorghum Sowing)

A labor-intensive but efficient sowing method where seeds are placed individually at specific intervals, using tools like bamboo tubes, suitable for dry land cultivation.

Transplanting (Sorghum Sowing)

Method of sowing where sorghum seedlings are grown separately and then transferred to the field, commonly used in areas with abundant rainfall and for hybrid sorghum production.

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Ratooning (Sorghum Cultivation)

Growing a crop from the stubble of a previously harvested crop, commonly used with sorghum and sugarcane, promoting efficient land use and generating additional yields.

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Mechanical Weed Control (Sorghum)

Managing weeds by using physical methods like hand weeding, cultivation with tools to disrupt weed growth and aerate the soil around the plants.

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Chemical Weed Control (Sorghum)

Using herbicides to control weeds, which can be applied before or after weed emergence, targeting specific weed types.

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Harvesting (Sorghum)

Harvesting sorghum when the grain is fully ripe, typically when the moisture content is less than 25%.

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Threshing (Sorghum)

Removing the grains from the sorghum stalks using manual methods or machinery, followed by separating the grain from chaff.

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Sorghum Grain Composition

Nutrient composition of sorghum grain, important for understanding its nutritional value and potential uses.

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Yield Attributes (Sorghum)

Factors that influence the overall yield of sorghum, including characteristics like panicle size, grain count, and grain weight.

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North India Sorghum Cropping Systems

Traditional cropping patterns in North India, where sorghum is commonly rotated with crops like wheat, cowpea, soybean, and pigeonpea.

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South India Sorghum Cropping Systems

Common cropping systems in South India, where sorghum is rotated with cotton, tobacco, pigeonpea, green gram, and other crops.

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Cenchrus Species (Sorghum Weed)

Grasses that commonly grow in sorghum fields and can compete for resources, negatively impacting yield.

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Amaranthus Viridis (Sorghum Weed)

A broadleaf weed frequently found in sorghum fields, known for its wide leaves and ability to compete with sorghum plants.

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Striga Species (Sorghum Weed)

A parasitic weed species that attaches to the roots of sorghum plants, weakening them and reducing yield.

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Drilling (Sorghum Sowing)

A common method of sowing sorghum seeds, where seeds are placed in lines using a seed drill, promoting even crop growth and efficient resource utilization.

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Ratooning (Sorghum Cultivation)

The practice of growing a second crop from the stubble of a previously harvested crop, such as sorghum, promoting efficient land usage and potentially increasing total yield.

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Mechanical Weed Control (Sorghum)

The use of physical methods, such as hand-weeding or using tools, to control weeds, improving soil aeration and disrupting weed growth.

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Chemical Weed Control (Sorghum)

The application of herbicides to manage weeds, categorized as pre-emergence (before weeds emerge) or post-emergence (after weeds emerge).

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Tillering Stage (Sorghum Growth)

The stage when sorghum plants are actively growing and producing a new stalk, typically occurring after initial growth and establishment.

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Thinning (Sorghum Cultivation)

The process of removing excess sorghum plants from the field to ensure optimal spacing and allow remaining plants to access more resources for better growth.

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Direct Sowing (Sorghum)

The method of growing a crop from seeds directly planted in the field, avoiding the need for separate seedling cultivation.

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High Moisture (Sorghum Grain)

High levels of moisture present in sorghum grain, often occurring during early harvest stages, which can impact storage quality and spoilage.

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HCN (Sorghum Grain)

A compound found in sorghum grain that can be toxic in high concentrations, requiring careful timing of harvest and handling.

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Manual Threshing (Sorghum)

The process of manually removing sorghum grains from the stalks, often used in small farms or for specific types of sorghum varities.

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Mechanical Threshing (Sorghum)

Using machines specifically designed to separate sorghum grains from the stalks, allowing for efficient and faster threshing processes.

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Winnowing (Sorghum)

The process of removing chaff and other debris from the threshed sorghum grain, using wind to separate lighter materials from heavier grains.

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Drying (Sorghum Grain)

The process of drying sorghum grain until it reaches suitable moisture levels for storage, preventing spoilage and mold growth.

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Study Notes

Sowing Methods for Sorghum

  • Broadcasting

    • Rarely used due to high seed rate (12-18 kg/ha) and uneven distribution.
    • Commonly employed in irrigated lands with proper bed and channel setup.
  • Drilling

    • Utilizes seed drills and covers seeds with guntaka or brush harrowing.
    • Seed rate ranges from 8-12 kg/ha; higher rates recommended for light soils, lower for black soils.
    • Standard spacing at 45x15-20 cm, depth of 3-4 cm.
  • Dibbling

    • Labor-intensive but economical, requiring only 6 kg/ha of seed.
    • Ensures equal growth opportunity for plants.
    • Seeds dropped directly or using bamboo tubes, typically in dry lands.
    • Recommended for kharif and rabi jowar, with thinning at 15-20 DAS.
  • Transplanting

    • Common in areas with sufficient rainfall, particularly for KONDA JONNA.
    • Involves planting seedlings in plough furrows when soil is wet.
    • Essential for hybrid sorghum production in South India, enhancing synchronization of male and female lines.
  • Ratooning

    • Additional crops grown from stubble of harvested crops (e.g., sugarcane, sorghum).
    • Successful in hybrid sorghum, yielding up to 11 quintals more than main crops with proper management.
    • Key management practices include timely irrigation, fertilizer application, and adequate moisture retention.

Weed Management in Sorghum

  • Mechanical Methods

    • Intercultivation using small implements like danthi to control weeds, aerate soil, and earthing up plants.
    • Timing: starts 15-20 DAS, repeated every 10 days for effective weed control.
  • Chemical Control

    • Pre-emergence: Atrazine or Propazine (0.25-0.50 kg a.i./ha).
    • Post-emergence: MSMA for nut grass control and 2,4-D for broadleaf weeds.
    • Striga control includes deep ploughing, nitrogen fertilization, and resistant varieties.

Harvesting and Threshing

  • Harvest when grains are hard and contain <25% moisture.
  • Harvesting techniques vary based on crop height and mixed cropping systems.
  • High HCN content in younger plants necessitates careful timing to prevent toxicity.
  • Threshing involves manual methods or machinery, followed by winnowing and drying.

Nutritional Composition and Yield Factors

  • Sorghum Grain Composition

    • Protein: 7.4-14.2%, Lipids: 2.4-6.5%, Carbohydrates: 70-90%.
    • Protein deficient in lysine and rich in leucine, critical for growth.
  • Yield Attributes

    • Factors affecting yield include:
      • Number of panicles per area
      • Panicle length
      • Count of filled grains per panicle
      • Test weight (1000 grain weight)
    • Expected yield: Rainfed (20-25 q/ha), Irrigated (50-60 q/ha).

Cropping Systems

  • North India Systems

    • Sequences: Sorghum-Wheat, Sorghum-Cowpea, and others.
    • Mixed cropping with Soya bean and Pigeonpea.
  • South India Systems

    • Sequences: Sorghum-Cotton, Sorghum-Tobacco, and more.
    • Kharif mixed cropping with Pigeonpea, Greengram, and others.

Important Weeds and Their Management

  • Common weeds include Cenchrus spp., Amaranthus viridis, and Striga species, which can significantly impact sorghum yield.
  • Control methods include systematic removal, chemical treatments, and planting resistant crops.

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