Summer Forages : Maize

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Questions and Answers

Considering the adaptation characteristics of maize, which edaphic factor most critically influences its yield potential, especially in regions with inconsistent precipitation patterns, therefore requiring advanced soil management strategies?

  • The soil's albedo, affecting thermal regulation.
  • Cation exchange capacity.
  • Water holding capacity. (correct)
  • Soil pH buffering capacity.

In the context of sustainable maize cultivation for fodder, strategically integrating rotation crops with maize is practiced, specifically with rice and potatoes. What complex ecological interaction and the associated benefit is most specifically optimized through this rotational strategy?

  • Enhancing soil thermal properties.
  • Modulating the allelochemic competition.
  • Disrupting pest and pathogen cycles. (correct)
  • Enhancing carbon sequestration.

In maize cultivation, the timing of harvest significantly affects the nutritional profile of the fodder. At which specific growth stage does maize fodder optimally balance carbohydrate accumulation and forage digestibility, making it ideal for optimizing ruminant animal performance, and how is this usually measured practically?

  • Dough stage, measured by the grain's resistance to compression.
  • Full maturity, measured by the cessation of dry matter accumulation in the grain.
  • Milk stage, measured by the starch content using iodine staining. (correct)
  • Early tasseling, measured by normalized difference vegetation index (NDVI).

The application of lime to acidic soils is a common agricultural practice, particularly relevant in maize cultivation. What complex soil chemical process is directly modulated by lime application, and how does this impact the bioavailability of essential nutrients to maize plants?

<p>Decreasing the concentration of aluminum ions, thereby increasing phosphorus availability. (D)</p> Signup and view all the answers

Maize varieties such as Opaque 2 and Floury 2 are notable for their enhanced nutritional profiles. What specific biochemical characteristic distinguishes these varieties from conventional maize, and how does this alteration affect their nutritive value for monogastric animals, assuming standard metabolic processes?

<p>Altered zein protein profile, improving lysine and methionine content. (C)</p> Signup and view all the answers

Sorghum exhibits notable adaptability to arid conditions. Which physiological mechanism most prominently contributes to its drought tolerance, enabling it to maintain productivity relative to other summer fodders and influence choices in semi-arid sustainable agronomy?

<p>Extensive root system and osmotic adjustment, sustaining water uptake under stress. (A)</p> Signup and view all the answers

Nitrate accumulation and prussic acid poisoning pose risks in sorghum fodder. What environmental scenario most significantly exacerbates these risks, requiring careful management strategies to ensure livestock safety concerning the plant's biochemistry?

<p>Drought stress followed by heavy rainfall, inducing rapid nitrate uptake. (B)</p> Signup and view all the answers

Sorghum varieties exhibit varying suitability for different harvesting strategies that could affect the fodder yield. Which advanced methodology should be employed to determine the optimal harvesting time, considering both yield and nutritional quality, such as fiber and protein content, and accounting for variety-specific growth patterns?

<p>Near-infrared reflectance spectroscopy (NIRS) analysis, quantitatively monitoring forage composition. (C)</p> Signup and view all the answers

Sadabahaar (Sudex) is a cross between sorghum and Sudan grass. How does its genetic architecture influence its adaptability, particularly concerning water use efficiency, relative to its parent species, and how would controlled environmental experiments prove this.

<p>Intermediate water use efficiency, balancing drought tolerance and rapid growth. (A)</p> Signup and view all the answers

In regions prone to shoot fly infestations, what aspect of Sadabahaar cultivation should be most carefully managed based on phenological studies involving multi-year data.

<p>Optimizing planting dates to avoid peak infestation periods which require intensive study of pest behavior. (C)</p> Signup and view all the answers

Considering the management of Sadabahaar for optimal nutritive value, what specific range of cutting heights promotes rapid regrowth and sustains high-quality fodder yield, and how does this relate to its carbohydrate reserves?

<p>30-40 inches, maintaining adequate leaf area for photosynthesis. (B)</p> Signup and view all the answers

Horses are particularly susceptible to equine cystitis when grazing on certain forages. Which compound presents the greatest etiological risk in Sadabahaar fodder, and what management strategy most effectively mitigates this risk regarding detoxification?

<p>Nitrates, mandating ensiling for nitrate reduction. (B)</p> Signup and view all the answers

Fox-Tail Millet is a forage crop adapted to specific soil conditions. Which soil characteristic most critically influences its productivity, considering that any deficiency can hamper overall production.

<p>Well-drained structure, facilitating aeration and root growth. (B)</p> Signup and view all the answers

In Fox-Tail Millet cultivation, farmers must carefully consider the timing of hay production to maximize its nutritional value. At what phenological stage should Fox-Tail Millet be harvested for hay to optimize nutritional composition, and how can the farmer most easily assess it visually?

<p>Pre-boot stage, ensuring maximum protein and minimum fiber content. (B)</p> Signup and view all the answers

For horses, Fox-Tail Millet is not recommended as hay. What specific toxins present in Fox-Tail Millet pose a potential threat to equine health, leading to kidney and joint complications, and how do these toxins interact with equine physiology requiring expert veterinary knowledge?

<p>Cyanogenic glycosides, inhibiting cellular respiration. (B)</p> Signup and view all the answers

Pearl Millet displays variable productivity based on environmental factors. Which climate conditions are critical for achieving optimal yields with minimal water input, considering the plant's tolerance to drought and acidity and how can soil management practices enhance its resilience?

<p>Sandy soils with moderate rainfall, promoting deep root growth. (A)</p> Signup and view all the answers

The timing of harvest profoundly affects Pearl Millet forage quality. At what specific developmental phase should pearl millet be harvested to maximize nutritive value for lactating animals, balancing crude protein and digestible fiber content, therefore influencing animal's lactation performance?

<p>Boot stage, maximizing protein while minimizing lignification. (D)</p> Signup and view all the answers

In the context of integrated pest management, what biological control strategies could be implemented to mitigate the impact of major insect pests in pearl millet production, and how would these strategies affect the plant's biochemistry.

<p>Releasing trichogramma wasps to parasitize stem borers, increasing photosynthetic rate. (C)</p> Signup and view all the answers

Given the data on corn forage composition, what is the most precise and cost-effective analytical approach a forage specialist can implement to ascertain the optimal harvest time for maximizing total digestible nutrients(TDN) in maize silage, while accounting for variations in fiber digestibility, ultimately optimizing feed efficiency in ruminant livestock?

<p>Employing wet chemistry techniques to fractionate neutral detergent fiber (NDF) and acid detergent fiber (ADF), providing accurate data on fiber digestibility. (C)</p> Signup and view all the answers

Considering the sorghum forage composition data, what complex interaction defines the trade-off between maximizing the crude protein (CP) concentration and minimizing the neutral detergent fiber (NDF) content in sorghum fodder, and how can farmers manipulate management practices to optimize this trade-off for improved animal nutrition?

<p>Nitrogen fertilizer application and strategic harvesting intervals enhance protein synthesis while mitigating NDF accumulation through decreased cell wall thickening. (D)</p> Signup and view all the answers

Given the nutritional composition data for Sada Bahar Forage, how would the ideal anatomical cutting point be calculated, as a function of dry matter, to achieve optimal grazing and/or hay production?

<p>Calculation of theoretical cutting height, based on maximizing yield, and maintaining protein. (C)</p> Signup and view all the answers

Given the nutritional composition data for the pearl millet forage, what complex rumen fermentation dynamics need to be altered by a specialist nutritionist to improve output?

<p>Increasing bacterial counts through novel feed additives to hydrolyze. (B)</p> Signup and view all the answers

Considering Maize's dual use, is there a planting method that is superior and will be less susceptible to traditional planting/growing issues?

<p>No planting method is superior. It is dependent on external factors. (D)</p> Signup and view all the answers

In a drought scenario, which forage crop is more likely to provide a higher yield: Pearl Millet, Sada Bahar Forage, Sorghum, or Maize?

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

When should an agronomist let animals graze and harvest Sorghum to lower the chances of poisoning in the Monsoon Season?

<p>Before grazing. (B)</p> Signup and view all the answers

Why is Fox-Tail Millet a great choice for hay for non-equine animals?

<p>It has an equitable protein content as its harvesting time can be altered. (C)</p> Signup and view all the answers

In equine species, which of the following is SadaBahar not ideal for when compared to the other species mentioned in the documentation, and why?

<p>It has high nitrate levels. (B)</p> Signup and view all the answers

Compared to pearl millet, sorghum, maize etc, is Sada Bahar as a crop, more or less versatile?

<p>More versatile. (C)</p> Signup and view all the answers

If Pearl Millet is planted, it must have adequate preparation in an area. Which soil profile is best suited for this planting?

<p>A well-drained profile due to oxygenation. (A)</p> Signup and view all the answers

For Pearl Millet, and in the case for lactating dairy cows, when is the optimal time to harvest?

<p>The booting stage. (A)</p> Signup and view all the answers

Is integrated pest management (IPM) important for crop production, and if so how does it help with the plant's biochemistry?

<p>It increases plant growth and biochemistry. (D)</p> Signup and view all the answers

With Sorghum exhibiting a higher DM, what are the implications to consider when considering its overall use?

<p>Sorghum can be preserved with relative ease when compared to other summer grasses listed. (B)</p> Signup and view all the answers

Which forage plant is more susceptible to higher levels of nitrates after drought conditions, and why?

<p>Sorghum, since the nitrates halt the conversion to essential amino acids and proteins, thus leading to its dangerous levels, if harvest immediately following the drought. (A)</p> Signup and view all the answers

If Sada Bahar must be planted on a farm or in order to allow for optimal growing conditions and production, which of the following is a critical factor?

<p>Well drained rich soil, and proper irrigation. (A)</p> Signup and view all the answers

Fox Tail Millet should be cut at what growth stage for optimal nutrition, palatability, and digestibility?

<p>At booting stage. (A)</p> Signup and view all the answers

The documentation notes one of the cons in Pearl Millet plants is that they are not to be fed, as hay, to horses. What specific issues can this have and/or result in?

<p>Joint, Bone, and Hoof related pains and/or problems. (D)</p> Signup and view all the answers

Pearl Millet is an asset; given the available documentation, which set of species will find great nutrition and palatability values?

<p>Lactating and drought ridden cattle. (C)</p> Signup and view all the answers

What is NIRS (Near-infrared reflectance spectroscopy), and why is it important in analyzing and understanding the different data points for the crops provided in the available documentation?

<p>A rapid, and non-destructive, process that aids with yield, composition, and/or harvest timings. (A)</p> Signup and view all the answers

From a global perspective, is there one major variable that must always be considered, independent of geography, when making decisions such as harvest, drought safety, and species type selections?

<p>Soil type. (A)</p> Signup and view all the answers

Flashcards

What are Summer Forages?

Summer forages which include maize, sorghum, sorghum sudan and millet.

What is Maize?

An annual erect plant, thick stemmed and leafy, reaching 8-10 feet tall, with high carbohydrate content and forage digestibility. Ready in 50-60 days.

Maize Establishment

Can be cultivated in 3 seasons: Feb-Sept, Feb-March, July-Aug, Aug-November. Can grow with rice & potatoes.

Maize Fertilization

Responsive to N2, P, and K. Lime application on acidic soils is required.

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What is Sorghum?

A summer grass fodder with nutritive quality of 85 to 90% corn.

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Sorghum's nutritional value

Nutritive quality of 85 to 90% corn. Suitable for all kinds of animals. Some varieties give 2 cuttings. Production lower by 30-40% in 2nd cuttings.

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What is Sadabahaar/Sudex?

A cross between sorghum and Sudan grass. Major summer fodder, coarse stemmed, erect annual, 8 ft tall, leafy, seed heads a panicle. Multi-cut fodder-- 3 to 4 cuts.

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Sadabahaar Management

Requires high stocking rate, grazed rotationally, cut at 30-40 inches height.

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What is Fox-Tail Millet?

Annual, summer fodder, 3-4 feet tall, leafy, fine stemmed, seed heads cylindrical bristled pinnacle.

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What is Pearl Millet?

Annual, summer fodder, 3-8 feet tall. Leafy, very wide leaves serrated at margins, seed head a large cylindrical spike.

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Pearl Millet Production

Harvested in 60-70 days, less productive than sorghum and Sada Bahar, only one cutting.

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Pearl Millet Management

Sowing method. Require high stock rate with rotational stocking. Cut for hay at 30-40 inch height.

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Study Notes

Summer Forages

  • Summer forages include maize, sorghum, soghum sudan, and millet.

Maize

  • Maize originates from Southern Mexico.
  • Maize is an annual erect plant with thick stems and leafy structure, typically growing to 8-10 feet tall.
  • Maize is High in carbohydrates with high forage digestibility and has dual purposes.
  • Maize is considered the most important fodder of the summer season.
  • Maize crops mature within 50-60 days of sowing.
  • The plant adapts well to soils with good water-holding capacity and irrigation.
  • It's majorly used as freshage, silage and grain.
  • Maize can be cultivated in three seasons: February to September, February-March to July-August-November.
  • When grown in rotation, it can be cultivated with rice and potatoes.
  • The seed rate for hybrid maize is 10-15 kg/acre with drill sowing with 40-50 kg for traditional sowing.
  • The crop production is around 20-25 tons/acre as fodder.
  • Hybrid varieties tend to yield less in arid conditions.
  • Maize responds well to fertilization with N2, P, and K, and requires lime application on acidic soils.
  • Types of maize include Baharia makaii (Feb, March), summer crop (July, Aug) and automn crop (Aug-Nov).
  • Pakistan's environment is well suited for maize production.
  • Maize is excellent for dairy and fattening animals.
  • Maize's starch content in grains is about 65%, and the TDN (Total Digestible Nutrients) value is 85-90%.
  • Protein in maize comes from Zein and Gluten.
  • Maize is Low in Ca++, has improved varieties such as Opaque 2 containing high lysine, and Floury 2 with high lysine and methionine.

Corn Forage Composition on DM Basis

  • Maize (early/full bloom) contains 16.07% DM, 13.4% CP, 1.9% EE, 36.8% CF, 40.8% NFE, 0.44% Ca, 0.28% P, and 1.5% Mg.
  • Maize (milk stage) contains 20.4% DM, 9.4% CP, 2.3% EE, 32.1% CF, 49.6% NFE, 0.41% Ca, 0.49% P, and 0.91% Mg.
  • Maize (late cut) contains 29.3% DM, 7.7% CP, 2.1% EE, 30.53% CF, 52.06% NFE, 0.25% Ca, 0.24% P, and 0.24% Mg.

Sorghum

  • Sorghum (Sorghum bicolor) originates from Northern Africa.
  • Sorghum is a major summer fodder: a coarse stemmed, erect annual plant that can grow 4-15 ft tall.
  • Grain types are short with large seed heads, and forage types are tall with small seed heads.
  • It is resistant to hot and dry weather, growing well in arid or irrigated zones.
  • Heavy rainfall and hilly areas are unsuitable as well as not tolerating acidic soils.
  • Recommended seed rate for fodder is 30-35 kg/acre and 8 kg/acre for the grain type.
  • Sow in March-Aug for fodder, mid july – mid aug for grain type using line and broad casting methods
  • Distances between lines should not be greater than 30cm
  • Requires irrigation 3 weeks post sowing with moderate fertilization.
  • It has nutritive quality up to 85 to 90% corn making it suitable for all types of animals.
  • There are some varieties that give 2 cuttings with a 30-40% lower production during the 2nd cut.
  • Harvest when cobs appear and the crop gives a milky appearance.
  • Average yield is 20-25 tons/acre.

Sorghum Forage Composition on DM Basis

  • Sorghum contains 28% DM, 2.1 to 2.2 ME (M.Cal/Kg), 8.2% CP, 57% NDF, 35% ADF, 3.5% EE, 9% Ash, 4% Ca, and 2.1% P

Sadabahaar (Sudex)

  • Sadabahaar (Sudex) originates from Northeast Africa.
  • It's a cross between sorghum and Sudan grass and is mainly used as summer fodder.
  • Coarse stemmed, erect annual, and it grows 8 ft tall: leafy with seed heads in a panicle and Multi-cut fodder-- 3 to 4 cuts.
  • Drought tolerant but is not tolerant to acidic soils.
  • Requires more irrigated water.
  • Used as pasture, hay, and silage and has high nutritive value if harvested at immature stage but is difficult to make into hay.
  • Can show nitric acid and prussic acid toxicity.
  • Excellent fodder during the period of shortage of fodder in summer (May and June).
  • Time of cultivation is Feb-July, including Pak-Sudex, SSG 988, and Local varities.
  • The seed rate is 10-12 kg / acre.
  • It should be grown in lines, with the lines being 50-70 cm apart.
  • Better to cultivate between March 15 to April 30.
  • In 3 cuttings it can produce 60-70 tons/ acre.
  • Very responsive to N2, lime treatment on acidic soils.
  • Less cuttings due to attack of shoot fly.
  • Requires high stocking rate and is preferably grazed rotationally to utilize rapid growth and maintain high nutritive value.
  • Horses should not be allowed to graze, to prevent equine cystitis.
  • Thin stemmed varieties recover more rapidly after cutting, and hay and silage should be cut at 30-40 inches height.

Sada Bahar Forage Composition on DM basis

  • Sorghum x Sudan grass contains 20% DM, 2.2 ME (Mcal/kg), 11% CP, 66% NDF, 36% ADF, 2.7% EE, 9.7% Ash, 4.6% Ca, and 1.5% P.

Fox-Tail Millet

  • Fox-Tail Millet originates from Southern Asia.
  • It's an annual summer fodder that grows 3-4 feet tall, leafy, fine stemmed, seed heads cylindrical bristled pinnacle.
  • It adapts in Irrigated and Barani regions which utilize well drained soil and is fairly drought tolerant, making it important in arid zones.
  • Can be grown in every soil except saline soil.
  • Used as fresh forage, hay, In dry stages, the stalk is consumed as fodder for animals.
  • Most varieties can be harvested in 60-70 days.
  • It is less productive than pearl millet, sorghum, and Sada Bahar with One cutting only.
  • Its establishment requies drilling 6.5 to 9 kg/acre.
  • It is responsive to N2 fertilization.
  • Should be cut for hay near seed head emergence.
  • Not recommended for horses hay: toxins can cause kidney and joint problems.

Pearl Millet

  • Pearl Millet originates from North central Africa.
  • It is an annual summer fodder that grows 3-8 feet tall; also characterized by leafy, very wide leaves serrated at margins, with a seed head having a large cylindrical spike.
  • Adapts primarily to sandy soils and is not adapted to calcareous soil but requires well-drained soil making it fairly drought and acidity tolerant.
  • Very suitable for lactating and drought animals.
  • Used Fresh forage, pasture and silage and has High nutritive value if harvested at immature stage with Nitrogen accumulating.
  • Can be harvested in 60-70 days
  • This crop yields less than sorghum and Sada Bahar. One cutting can be made.
  • Sowing method is seed broad caste and line spacing=1ft
  • Drilling 6 kg/acre in irrigated and 4 kg in un irrigated kg/acre and 11 to 14 kg broad casting
  • Fertilization: Responsive to N2, more tolerant to soil acidity than sorghum
  • Best time of cultivation is April- Aug.
  • Require high stock rate, preferably with rotational stocking.
  • Varieties suitable for use in Pakistan include Giant, Composit- 79 for multicuts, 18-BY, MB-87 and MB-95.

Pearl Millet Forage Composition on DM Basis

  • Pearl millet contains 20-25% DM, 2.2 ME (Mcal/kg), 12.4% CP, 65% NDF, 34.5% ADF, 2.0% EE, 12% Ash, 5.5% Ca and 2.6% P.

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