Notes on Soil Fertility Management in Ancient China

The History of Soil Fertility Management in Ancient China

Overview of Ancient China’s Agricultural Practices

  • China's Historic Agricultural Significance:
    • One of the oldest agricultural countries globally.
    • Early adopters of fertilizer usage.
    • Farmers accumulated extensive knowledge regarding soil fertility management.

Methods Utilized in Soil Fertility Management

  • Six Primary Methods:
    1. Tillage
    2. Fertilization
    3. Crop Rotation
    4. Green Manure
    5. Fallowing
    6. Multiple Cropping
  • Importance: These methods contributed significantly to sustaining soil fertility and increasing crop production.
  • Fertilizer Application Techniques: Include basal manure, seed manure, and after manuring, recognized since 1st century B.C..
  • Rational Application Guidelines: Based on soil type, crop species, and leaf color, known since the early 18th century.
  • Types of Fertilizers Used: Both organic materials (like manure) and inorganic materials (like certain minerals).

Critical Historical Insights

Fertilization and Soil Management
  • Terminology: In ancient Chinese agriculture, the modern term "fertilizer" was not used; referred to as "manure" (e.g., grass manure, muck, hair manure).
  • Green Manures: Also considered types of manure.
  • Historical Phases of Development:
1.1 Before Present Era (BPE)
  • Early Fertilization Practices:
    • New Stone Age (circa 2200 B.C.): First fertilization recorded, utilizing natural plant residues.
    • Archaeological Findings: Wooden tools found in Wuxing County, used for fertilization and irrigation, resembling modern tools.
  • Xi Zhou Period (1066-700 B.C.):
    • Weeds were removed and rotted to improve growth, constituting the earliest recorded fertilization methodology.
    • Transition from relying solely on natural weeds to purposefully adding manures to soils.
1.2 Chun Qiu and Zhan Guo Periods (700-211 B.C.)
  • Wider adoption of fertilization practices.
  • Innovative use of waterlogged manures created through summer heat.
  • Abandonment of fallow systems in favor of successive planting systems, reliant on fertilization for productivity maintenance.
    • Ancient Chinese farmers relied more on fertilizers than previous periods.
Zhan Guo Era
  • Advancement due to Feudalism:
    • Introduction of iron farming tools and animal power increased production.
  • Advancements in Fertilization Techniques:
    • The use of fallen leaves as fertilizers noted.
Xihan Period (32-7 B.C.)
  • Agricultural Progress: Documented in "Wan Sheng Zi Shu" detailing innovative fertilizing methods that included:
    • Incorporation of weeds into soil, seeding after rain for optimal contact.
    • Introduction of varied fertilization methods such as basal manure and seed manuring.
    • First mention of multiple applications of fertilizers during a single crop cycle.

Present Era Developments

  • Evolving Practices:
    • Purposeful planting of green manure.
    • Adoption of inorganic fertilizers; multiple cropping and rotation cropping were more prevalent practices.
  • Xiji Period (200-534 A.D.): Notable recordings in "Guang Zhi" on green manures, notably alfalfa.
  • Green Manure Impact: Integral in enhancing soil fertility amidst rising population and cultivated lands requiring increased fertilizer.

Advances in Agricultural Literature and Techniques (500 A.D. and Beyond)

  1. Qi Min Yao Shu by Jia Shixie: Comprehensive analysis of green manures and their efficacy, with documented comparisons:
    • Fertilizer efficiency ranking of various green manures.
    • Analysis of green manures versus rotten organic matter.
    • Exploration of green manures in rotational systems with other crops.
    • Time-saving benefits of using green manures.
  2. Tang Dynasty (700 A.D.): Notions of composting with plant straw and animal manure emerged.
  3. Ming Dynasty (1600 A.D.): Explored complex techniques for seed manuring, including monitoring rice leaf color to determine fertilization needs.
  4. Qing Dynasty (1700-1900 A.D.): Refined fertilization strategies in accordance with seasonal variations and types of crops. Entailed using manures methodically based on soil type.

Resources of Manures in Soil Fertility Maintenance

  • Ancient Fertilizer Components (Zhan Guo times onward):
    • Variety of manures, including:
    • Human manure and urine,
    • Silkworm manure,
    • Organic by-products such as bones and plant ash.
  • Expanding Resource Base (200 A.D. and beyond):
    • Green manures along with newer organic and inorganic amendments like lime and gypsum entered the agricultural paradigm.
    • Over the Ming and Qing dynasties, approximately 130 different species of fertilizers were documented, emphasizing the diversity and adaptability of ancient Chinese agricultural practices.

Manure Processing Techniques

  • Fundamental Processing Methods:
    1. Waterlogged Compost: Weeds utilized for composting, especially during summer.
    2. Compiling Compost: Techniques evolving through the ages based on harvest residues, illustrated in texts from both Tang and Qing dynasties.
    3. Specialized Manures: Techniques like Zhu Hui (ash combined with livestock manure), earth manure, and cake manure were emphasized.
    4. Green Manure: Integrated into rotations, reinforcing soil fertility and aiding crop yields.

Facilities for Sustaining Fertilizer Efficiency

  • Storage Solutions:
    • Insight from the Song dynasty emphasized the need for dedicated facilities to protect fertilizers from weather elements, such as exposure to sun and wind.

Conclusion

  • Ancient Chinese farmers developed a complex and innovative approach to soil fertility management, emphasizing the interplay between organic and inorganic fertilizers, processing techniques, and adaptive practices to enhance agricultural productivity over centuries.