The Relationship of Slopes to Soil Properties on Oil Palm Land

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Padangsidimpuan– Slope Gradient Influences Soil Properties in Oil Palm Plantations. A study conducted by Sohibul Mikrat Nasution, Yusriani Nasution, Erwin Syah Lubis, Rasmita Adelina, and Dini Puspita Yanty from Graha Nusantara University, Padangsidimpuan was published in the International Journal of Integrated Science and Technology (IJIST) Vol. 4 No. 2 (February 2026).

A study conducted by Sohibul Mikrat Nasution, Yusriani Nasution, Erwin Syah Lubis, Rasmita Adelina, and Dini Puspita Yanty from Graha Nusantara University, Padangsidimpuan, reveals that variations in land slope are closely associated with differences in soil texture, pH, organic carbon content, and essential macronutrients such as nitrogen (N), phosphorus (P), and potassium (K).

Three Slope Classes Examined

The researchers applied a survey method using purposive sampling across three slope categories:

Gentle slopes (0–15%)
Moderately steep slopes (16–30%)
Very steep slopes (31–45%)

Observed soil parameters included:

Soil texture
Soil pH
Organic carbon (C-organic)
Macronutrients: nitrogen (N), phosphorus (P), and potassium (K)

This approach allowed the team to analyze how topographical variation influences soil quality in plantation systems.

Slope and Soil Degradation Risk

Slope gradient significantly affects erosion intensity and nutrient distribution. The steeper the slope, the greater the risk of topsoil loss due to surface runoff. Topsoil contains the highest concentration of organic matter and nutrients essential for plant growth.

The study found that steeper slopes tend to have lower organic matter content, likely due to increased erosion and nutrient leaching. In contrast, gentle slopes show better organic matter accumulation because water flow is more controlled, reducing soil loss.

These differences directly influence soil fertility and long-term plantation productivity.

Soil pH and Nutrient Availability

Variations in slope gradient were also associated with differences in soil acidity levels. Soil pH influences nutrient availability and plant uptake efficiency.

The distribution of nitrogen, phosphorus, and potassium differed across slope classes. These variations have practical implications for fertilizer management strategies in oil palm plantations.

The findings emphasize that land management practices should not be uniform across areas with different slope characteristics.

Implications for Sustainable Oil Palm Management

The study confirms that slope gradient has a complex relationship with soil properties and must be considered in conservation planning.

Recommended strategies include:

Implementing soil conservation measures on steeper slopes
Establishing cover crops to reduce erosion
Adjusting fertilizer application based on slope conditions
Applying terracing techniques on very steep land

Without proper management, sloping oil palm plantations face long-term risks of soil fertility decline and land degradation.

Supporting Sustainable Plantation Development

This research contributes valuable insights for sustainable oil palm cultivation. By understanding how slope influences soil properties, plantation managers can:

Improve fertilizer efficiency
Minimize nutrient loss
Reduce erosion rates
Maintain long-term productivity

Data-driven land management strategies are increasingly important as plantations expand into hilly and marginal lands.

Author Profiles

Sohibul Mikrat Nasution- Universitas Graha Nusantara Padangsidimpuan
Yusriani Nasution- Universitas Graha Nusantara Padangsidimpuan
Erwin Syah Lubis- Universitas Graha Nusantara Padangsidimpuan
Rasmita Adelina- Universitas Graha Nusantara Padangsidimpuan
Dini Puspita Yanty- Universitas Graha Nusantara Padangsidimpuan

Research Source

Nasution, S. M., Nasution, Y., Lubis, E. S., Adelina, R., & Yanty, D. P. (2026). The Relationship of Slopes to Soil Properties on Oil Palm Land. International Journal of Integrated Science and Technology (IJIST), Vol. 4 No. 2, 112–121.

DOI: https://doi.org/10.59890/ijist.v4i2.285

URL: https://ntlmultitechpublisher.my.id/index.php/ijist