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Zorluk: OrtaAgricultural Systems, Crop Production, and Pastoralism in Nigeria

Rubber (*Hevea brasiliensis*) cultivation in Nigeria is predominantly concentrated in the rainforest belt of Edo, Delta, and Cross River States rather than the Northern Savanna. Which environmental factor is primarily responsible for this spatial distribution?

  1. Abundant annual rainfall above 1500 mm1500\text{ mm} and high relative humidity year-roundCevap
  2. B
    Prolonged dry harmattan seasons and light sandy soils
  3. C
    Low relative humidity combined with wide diurnal temperature ranges
  4. D
    Poorly drained, heavy clay soils with seasonal waterlogging

Cevap

Rubber cultivation in Nigeria relies on heavy annual rainfall exceeding 1500 mm1500\text{ mm} and high relative humidity year-round, conditions that occur in the southern rainforest belt.
Rubber (*Hevea brasiliensis*) is a tropical rainforest tree crop requiring heavy rainfall (>1500 mm>1500\text{ mm} annually), high relative humidity, and deep, well-drained soils. These conditions exist in southern Nigerian states such as Edo, Delta, and Cross River.

Adım Adım Çözüm

1
Identify the ecological requirements of perennial tree cash crops like rubber
Rubber trees require warm temperatures (24−28∘C24-28^{\circ}\text{C}), high annual rainfall (>1500 mm>1500\text{ mm}), and consistently high humidity without long drought periods.
Perennial tree crops demand continuous moisture supply to maintain foliage growth and latex production.
2
Analyze the spatial environmental gradient across Nigeria
Southern states like Edo, Delta, and Cross River lie in the humid rainforest belt, whereas northern states experience severe dry harmattan seasons and low annual rainfall.
Nigeria's rainfall follows a south-to-north gradient, decreasing significantly toward the northern savanna.
3
Select the option describing the favorable rainforest conditions
The option citing abundant rainfall above 1500 mm1500\text{ mm} and high relative humidity year-round correctly explains why rubber production is concentrated in the south.
This directly matches the physiological requirements of the crop.

Anahtar Kavram

Ecological requirements and spatial distribution of tree cash crops in Nigeria
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Konular

Agricultural Systems, Crop Production, and Pastoralism in Nigeria

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