Modern Conventional Farming Methods

Modern Conventional Farming: The Chemical Age

  • Intensive systems relying on chemical fertilizers and pesticides for high yields.
  • Focus on replenishing nutrients instead of maintaining overall soil health.

Concerns Associated with Modern Agriculture

  • Ecological: Soil degradation (structural decline, erosion, salinity, acidification, fertility loss), water contamination (nutrient loading).
  • Economic/Social: Farmer competition, income disparity, pressure for low-cost production.
  • Health: Effects of antibiotics and contaminants (pesticides, nitrates) on the public.

Productivity Growth

  • Australian agriculture: Productivity growth has been approximately 2%2\% or more per year for thirty years.
  • Developing world: Agricultural yields have almost tripled in the last fifty years.

Fertilizers

  • Increased food demand since the 1960s met by improved agricultural productivity using fertilizers.
  • Intensified land use requires more nutrient replacement for sustainability.
  • Population and wealth growth are key drivers of fertilizer demand.
  • FAO estimated that more than 33%33\% of the increase in cereal yields in the 1970s and 1980s resulted from fertilizer use.
  • World fertilizer use has increased almost fivefold since 1960.
Dead Zones
  • Caused by excessive phosphorus and nitrogen from fertilizers.
  • Leads to microorganism growth, oxygen depletion, and marine life death.
  • Common in coastal areas with high population density.
  • Nutrient pollution from fertilizers is a primary cause.
  • Algae overgrowth, decomposition, and oxygen consumption.
Historical Context
  • Before mineral fertilizers: Soil fertility maintained by organic material recycling and crop rotations.
  • Periodic famines were endemic under this system.
Nanofertilizers (NFs)
  • Application of nanotechnology to fertilizers.
  • Potential to enhance production and mitigate food insecurity risks.
  • May alleviate damage to soil quality from conventional fertilizers.
  • Potential benefits: Increased crop yield, plant growth promotion, reduced soil impact.
Risks
  • Continued excessive use of conventional fertilizers may harm soil and human health.
  • Environmental, occupational, and food supply risks associated with nanofertilizers must be evaluated.

Herbicides

  • Broad Spectrum: Works on a wide variety of weeds.
  • Selective: Works on a narrow range of weeds.
  • Contact: Destroys plant tissue at the point of contact; requires even coverage.
  • Systemic: Moves through the plant and can be injected into the plant.
  • Residual: Applied to the soil, destroys root uptake, remains active, and controls germinating seeds.

Pesticides

  • Generic term for natural and synthetic chemicals (over 700) to protect crops from pests.
  • Pests: Insects, slugs, snails, nematodes, worms, mites, rodents, weeds, molds, bacteria, viruses.
  • Application: Before/during plant growth or to stored crops (e.g., fumigants).
Arguments for Pesticide Use
  • Ensuring an improved and relatively stable food supply.
  • Meeting consumer expectations for blemish-free produce.
Arguments Against Pesticide Use
  • Leave residuals in the environment and on food.
  • Need for a more holistic approach to pest management to balance ecosystems.
Health Risks
  • Possible increased risk of Parkinson's disease.
  • Possible increased risk of neuropsychiatric disorders (ADHD, autism, learning disabilities, aggressiveness).
  • Possible increased risk of some cancers.
  • Possible increased risk of endocrine-related disorders.
Minimizing Pesticide Exposure
  • Trim fat from meat, remove skin from poultry and fish.
  • Discard fats/oils from broths and pan drippings.
  • Select fruits/vegetables without holes.
  • Wash fresh produce in warm running water, using a scrubber.
  • Peel oranges/grapefruits with a knife, avoid biting the peel.
  • Discard outer leaves of leafy vegetables.
  • Peel waxed fruits/vegetables.
  • Peel vegetables/fruits when appropriate (removes fiber/nutrients).
  • Eat a variety of foods.
  • Consider buying certified organic foods.
Nanopesticides
  • Utilize nanoparticle technology.
  • Potential to reduce the total use of pesticides and fertilizers.
  • Pose potential health threats if not handled correctly; require a risk mitigation framework.
  • Targeted and slow-release delivery can be toxic to the environment and human health.

Persistent Organic Pollutants (POPs)

  • Toxic chemicals affecting human health and the environment.
  • Introduced during the post-WWII industrial boom for pest/disease control and crop production.
  • Transported by wind/water, affecting regions far from the source.
  • Resistant to degradation, enduring in the environment.
  • Accumulate through the food chain, concentrating in fatty tissue.
  • Health effects: Reproductive, developmental, behavioral, neurologic, endocrine, and immunologic impairments.

Antibiotics

  • Used for disease treatment/prevention and as feed additives in livestock.
Concerns
  • Development of antibiotic-resistant bacteria that can transmit to humans.
  • Antibiotic residuals in food.
  • Livestock is a major contributor to antibiotic resistance.
  • Low-dosage antibiotic feeding for growth promotion.
  • Highest antibiotic consumption in livestock sector: China, US, Brazil, India.

Hormone Growth Promotants (HGPs)

  • Used in Australia for over 30 years (about 40%40\% of cattle).
  • Implants behind the ear in grass-fed and feedlot sectors.
  • Improve growth rate and feed efficiency.
  • Increase productivity, lessen environmental impact, and reduce greenhouse gas emissions.
Economic Impact
  • Without HGPs, cattle herd would need to increase by an estimated 7%7\% (2,000,000+ head) to produce the same amount of beef.
  • Would require more resources (water, feed) and increase production costs.
Regulations
  • EU has banned HGPs and import of products from cattle given HGPs since 1998.
Health Assessment
  • 2003 Australian report: Unlikely health risk to consumers from eating meat from cattle treated with HGPs according to good veterinary practice.

Chickens

  • HGPs are not permitted in chickens in Australia (banned for over 50 years).
  • Rapid growth due to selective breeding and optimal nutrition.
  • Meat chickens (broilers) selectively bred for growth rate.
  • Distinct from chickens bred for egg production.