Subject: Crop Requirements

From: [email-masked] (WILLIAM ALLAN)
Date: 3 Feb 94 14:13:38 GMT

Climatic and Physical Soil Crop Requirements

The resource section of the department of agriculture at Elsenburg, SA,
requires climatic and physical soil based crop requirement data of the
main decidious stone - and pom fruit varieties as well as for leading
vine cultivars with regard to the following climatic and soil critereon
on a minimum, optimum,maximum tolerance basis for the different growing
stages of the crop namely, bud-bloom, bloom-fruit set, fruit
set - ripening, after harvest - leaf fall and lastly, the dormant period.

-   Climatic critereon

    a)  Daylight length (hours)
        Radiation flux density (Watt/m2)
        Temperature (oC)
        Cold Units (Richardson)
        Heat Units (degree hours/days)
        Relative humidity (%)

    b)  Total water requirement per growing season (mm)

-   Physical soil  critereon

    Effective soil depth (mm)
    Soil strength (kpa)
    Bulk density (Kg/kub.m.)
    Soil temperature summer (%)
    Soil temperature winter (%)
    Texture (clay) (%)