Climate agriculture
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Climate & Agriculture - PowerPoint PPT Presentation

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Climate & Agriculture. Agricultural has evolved into a highly technical field.

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Climate agriculture

Agricultural has evolved into a highly technical field.

Dramatic changes occurred in the 20th century: genetics, improved fertilizers, increased disease resistance, and the substantial input of energy into farming methods has dramatically increased on productivity. However

The prevailing climate of a region still places distinct limitations on what crops can be grown and, in part, determining the hazards to which the crops are exposed.

Example: bananas will not grow in Wisconsin; Deciduous fruit trees will not fruit in tropics; Climate has impact on quality (protein content) of wheat. Highest protein content wheat is in wheat belts of North America and black-steppe area of the former U.S.S. R. (mid-lat grassland biomes of the world); But hazards for wheat are still problems: hailstones. Example: a single storm in Nebraska destroyed 3 million bushels of standing wheat.

Energy input: sunlight, fuel for tractors, food for the farm workers


Pro: maximize the benefits of this energy supplant and obtain highest yield for all input.

Con: it contrasts to climax ecosystem, where diversity is a key to the maintenance of the system

Example: Boll Weevil problem in the cotton belt of southern US

Potato famine of Ireland and Europe, 1840s (potato blight led to 2 million death).

Climate agriculture

Due to the weather-related risks in agricultural practices, some adaptations have been made to ease the vulnerability:

  • Risk spreading though insurance schemes and cooperative farming schemes

  • Environmental manipulation (irrigation and fertilization)

  • Managed diversification (crop rotation and dual-purpose livestock)

  • Modified farming system (modified crop calendar and improved storage)

Relocation of plants based on climate conditions
Relocation of plants based on climate conditions some adaptations have been made to ease the vulnerability:

Banana is native to SE Asia, now spread into tropical America

Potato originated in America, now in Europe

Sugar cane from SE Asia, now in tropical America

Rubber trees from equatorial rainforest in Amazon basin, now are in plantations in SE Asia.

Relocation results in better yields:

  • Native place, they are integral part of the environment, thus susceptible to pests and the competition of other plants of that origin. Through transportation natural limiting factors are removed

  • Due to purpose of production, they are treated with special care and afforded much attention.

Extending climate limits
Extending climate limits some adaptations have been made to ease the vulnerability:

1. Frost protection

Radiation frost occurs

at local area; Advection

frost is caused by cold air

flowing into region and covers a wider areas (cP air from North)

  • Plant way from cold valley (above inversion)

  • Heater to mix air

  • Sprinkling and flooding to increase thermal conductivity, reduce excessive cooling, supply latent heat

  • Brushing: cover up plants to reduce nighttime radiation loss

Climate agriculture

2. irrigation some adaptations have been made to ease the vulnerability:: water required by a plant to function at its maximum capacity (PE) design irrigation system using water budget.

Three areas need augmentation of precipitation:

  • Perpetual drought (desert)

  • Seasonally water deficit

  • Periodic drought

Thornthwaite and mather s water budget calculation
Thornthwaite and Mather’s Water Budget Calculation some adaptations have been made to ease the vulnerability:


  • When P is larger than PE, excess water will go to recharge soil moisture until it reaches the field capacity, then leftover will be runoff

  • When PE is larger than P, plants draw moisture from soil and the soil storage falls below capacity

  • Actual evapotranspiration (AE):

    If P>PE, AE=PE

    If P<PE, AE=P+ absolute value of storage change

    4. Deficit occurs when AE<PE

    5. After deficit period, (when P becomes >PE), excessive water will recharge soil to capacity before surplus (or runoff) occurs

Climate and crop yield light heat and moisture condition are the most important factors
Climate and Crop Yield: moisture table)light, heat and moisture condition are the most important factors


(1)Photosynthesis: carbon+water+solar energy=hexose sugar+oxygen (sun light determine the rate of photosynthsis)

(2) Photoperiodism: plants response to the length of the daylight hours

Long-day plants: flower only when daylight is greater than 14hours

Short-day plants: flower only when daylight is less than 14hours

Day-neutral plants: bud under any period of illumination

Intermediate plants: flower with 12 to 14 hours of daylight but not outside these limits

Climate agriculture

(2) Temperature moisture table)

Tropical plants: 20-30C(68-86F)

Mid-latitude plants: 15 to 20C (59-68F)

Growing degree days (GDD): degrees accumulated above a certain baseline (depending on plants)

Sunflower and potatoes: 45F; corn and soybeans 50F;