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3 Irrigation and plant health qs - responses

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IRRIGATION AND PLANT HEALTH
ANSWERS
LIVRET PAGE 1
1A
2B
3B
4A
5A
6C
7 a) Wet, cool conditions
b) Alternaria, Botrytis cinerea, Fusarium, Macrophomina phaseoli, Phyllosticta,
Phytophthora, Pseudomonas, Pythium, Rhizoctonia solani, Sclerotium rolfsii, Thielaviopsis
8 a) The affected plant has little or no ability to manufacture carbohydrates through photosynthesis
and may die unless the cause of its chlorophyll insufficiency is treated
b) because the leaves appear yellow
c) leaves / leaf
9C
10 Plants grown in containers dry out easily and then are often overwatered
LIVRET PAGE 2
Compost – 1 : A mixture of various decaying organic substances, as dead leaves or manure, used for
fertilizing soil.
2 : A composition; compound ( used to refer to Peat (Tourbe) / coir / composted bark (écorces
composté) mixtures used for seed-sowing or cuttings).
Sodden – soaked with liquid or moisture ; saturated
Turgidity – swollen, distended, tumid
Foliage - the leaves of a plant, collectively; leafage.
Wilt - to become limp and drooping, as a fading flower; wither.
LIVRET PAGE 3
a) Clay soils contain very small air- spaces between the soil particles, making it moistureretentive and difficult for water to drain through.
b) Thin soils on chalk are very alkaline. Water drains through easily, as do soil nutrients.
c) Water-drainage or retention of both soil types mentioned can be improved by adding organic
matter such as manure.
LIVRET PAGE 4
1 Fruits are unusually small and have a thick skin. The surface may be ruptured with splits caused
when
2 the fruit swells in response to the suddden availability of water.
3 infection by secondary organisms
4 grey mould (botrytis)
5 Other symptoms might be Blossom End Rot. Leaves fail to grow at a regular rate and so develop an
uneven, puckered surface, buds may fail to form, and later drop, and bark may split.
6 An irregular or erratic supply of water at the plant roots. Plants growing on a light sandy soil with
low organic matter and plants grown in containers are particularly prone.
7 Keep plants adequately watered at all times. Incorporate bulky organic matter into light soils
before planting. Apply a bulky mulch around the root areas to encourage soil moisture retention.
LIVRET PAGE 5
Leaves are puckered and distorted.
LIVRET PAGE 6
Cracks, normal appearance, deterioration of root, rotting, secondary infection
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