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Corn Production Guide
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Corn Production Guide
Corn Production Guide
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1
Question
How does soil type affect watering needs for corn crops?
Answer
Sandy soil drains quickly and needs more water, while clay soil retains water but can become compacted and may require careful watering to avoid waterlogging.
2
Question
What simple physical test can be used to assess if soil moisture is sufficient for planting?
Answer
Squeeze a handful of soil: if it crumbles easily, moisture is sufficient; if it clumps together, more water is needed.
3
Question
Why is drip irrigation considered efficient in dry, tropical areas like the Philippines?
Answer
Drip irrigation delivers water directly to the roots, minimizing water loss and preventing waterlogging, making it efficient in dry tropical climates.
4
Question
What steps should be taken to prepare the seedbed before planting corn?
Answer
Clear the area of weeds, rocks, and debris; loosen the soil 10-15 cm deep using a rake or tiller; avoid working soil when too wet or dry; aim for a fine, crumbly seedbed to allow easy root penetration.
5
Question
Define 'plant population' and give the recommended range for conventional corn varieties.
Answer
Plant population is the number of corn plants per unit area, typically per acre. For conventional varieties, 28,000 to 32,000 plants per acre is generally recommended.
6
Question
What factors influence the optimal corn plant population and spacing?
Answer
Soil fertility, weather conditions, corn variety, soil drainage, and organic matter content influence optimal population and spacing.
7
Question
Describe the recommended spacing between corn rows and between plants within a row.
Answer
Rows should be spaced at least 75 cm apart for adequate sunlight and airflow; within each row, plants should be spaced 15-25 cm apart.
8
Question
What advantages does ridge planting provide compared to flat planting?
Answer
Ridge planting results in taller plants, 3-9% more green cobs, better soil conditions like more air, less soil hardening, fewer weeds, better nutrient availability, and no waterlogging, all promoting better root growth and plant stability.
9
Question
Why is water management critical in corn production, especially around silking?
Answer
Water shortages two weeks before and after silking can reduce yields by 20-90%, as water supports starch movement, nutrient transport, photosynthesis, and cell turgidity, which are all crucial during grain development.
10
Question
List the main natural water sources corn plants rely on.
Answer
Corn plants rely on rainfall, atmospheric water (dew and fog), surface water (lakes, rivers, reservoirs), and groundwater from saturated zones.
11
Question
When should irrigation be applied to corn crops?
Answer
Irrigation is needed when soil moisture drops to 50% of field capacity, if natural water sources are unavailable, when rainfall is absent, or when plants show stress signs like wilting or leaf rolling between 10 AM and 12 PM.
12
Question
Compare furrow, sprinkler, and drip irrigation for corn production.
Answer
Furrow irrigation is practical and cost-effective, submerging 20-50% soil surface; sprinkler distributes water uniformly, ideal for hilly terrain; drip irrigation delivers water efficiently at low pressure directly to roots, minimizing waste.
13
Question
Identify common pests of corn and one main management strategy for each.
Answer
Corn Earworm - biological control with predators like Trichogramma; Corn Leafhopper - cultural control with early planting and reflective mulch; Armyworms - monitoring moth flights and using Bacillus thuringiensis; Aphids - biological control with parasites and oil sprays; Cutworms - cultural methods eliminating weeds before planting.
14
Question
What is the importance of soil sampling and analysis in corn nutrient management?
Answer
Soil sampling helps determine nutrient needs by identifying nutrient levels and soil conditions, enabling targeted fertilizer application for optimal corn growth.
15
Question
Differentiate between inorganic and organic fertilizers used in corn production.
Answer
Inorganic fertilizers provide concentrated nutrients (N, P, K) that are immediately available; organic fertilizers release nutrients slowly while improving soil structure and long-term fertility.
16
Question
What are the primary nutrient requirements (NPK) for corn to achieve a 5-ton per hectare yield?
Answer
135 kg of nitrogen (N), 37.5 kg of phosphorus (P), and 100 kg of potassium (K) per hectare.
17
Question
How does liming improve acidic soils for corn cultivation?
Answer
Liming neutralizes soil acidity (pH below 5.3), improves nutrient availability, and enhances soil structure, which benefits corn growth.
18
Question
Explain the key indicators used to determine the right time to harvest corn.
Answer
Indicators include black layer formation at the kernel base signaling physiological maturity, kernel moisture content of 20-25%, glazed kernels, dry leaves and husks, firm ears, and kernel denting at 30-35% moisture.
19
Question
Compare manual and mechanical harvesting methods for corn.
Answer
Manual harvesting uses tools like knives for small farms and is labor-intensive; mechanical harvesting uses combine harvesters, stripper machines, or corn pickers for faster harvesting on larger farms.
20
Question
Why is drying corn immediately after harvest important?
Answer
Drying to about 18% moisture prolongs storage life, prevents quality deterioration, and reduces bio-respiration, minimizing spoilage and preserving seed viability.
21
Question
What are common methods of drying corn, and what temperatures are recommended?
Answer
Sun drying for 2-3 days, mechanical drying for 6-8 hours with forced heated air not exceeding 48°C (120°F) are recommended to avoid seed damage.
22
Question
Why is sorting important after drying corn ears?
Answer
Sorting removes off-types, diseased, or damaged ears to maintain quality, prevent contamination, and ensure uniformity during storage and processing.
23
Question
At what moisture content is shelling corn seeds typically done, and why?
Answer
Shelling is done when seed moisture is 14-16% to reduce seed damage; high moisture (above 35%) during mechanical shelling can cause damage.
24
Question
Describe key post-harvest steps essential for seed conditioning.
Answer
Drying to proper moisture, sorting and cleaning debris, grading based on kernel size and quality, applying chemical seed treatments to control pests and diseases, bagging for protection, and storing under controlled moisture and temperature conditions.
25
Question
What role does seed treatment play in corn production, and what chemicals are commonly used?
Answer
Seed treatment controls pests and diseases like weevils and fungi to protect seed viability. Common chemicals include Malathion, Ridomil, Decis, and Rosa Pink at specified doses per kg of seed.
26
Question
What are the ideal storage conditions for corn seeds to maintain quality for one to two years?
Answer
Store seeds at 18-20°C with relative humidity of 60-70%, in dry and sanitary conditions to prevent mold and insect damage.