Moisture
Potatoes require a continuous supply of soil water along with adequate soil aeration. Yields are greatest
when soil moisture is maintained above 65% of the available soil water (ASW) capacity.
Tuber set is particularly sensitive to moisture stress. There are generally fewer tubers set when available
soil moisture is maintained below 65% of the available soil water (ASW) capacity. The amount of water
needed by potatoes varies with the soil type, temperature, humidity, air movement, plant and stem
populations, variety and cultural practices. In Alberta and Saskatchewan, too little moisture and fluctuating
moisture levels are more common than excessive moisture. In Manitoba, the situation is reversed. Too
much moisture generally causes more problems than too little moisture. Low or fluctuating moisture levels
can contribute to common scab, early dying, hollow heart, knobby tubers, low dry matter, low tuber set,
and low yield. Excessive soil moisture resulting in poor aeration and water logging of the soil reduces
yields and in extreme cases causes tuber rot. An excess of moisture may also lead to enlarged lenticels,
which are openings of the epidermis. This detracts from their appearance and allows entry of disease
organisms, causing tuber rot in storage.
MoisturePotatoes require a continuous supply of soil water along with adequate soil aeration. Yields are greatestwhen soil moisture is maintained above 65% of the available soil water (ASW) capacity.Tuber set is particularly sensitive to moisture stress. There are generally fewer tubers set when availablesoil moisture is maintained below 65% of the available soil water (ASW) capacity. The amount of waterneeded by potatoes varies with the soil type, temperature, humidity, air movement, plant and stempopulations, variety and cultural practices. In Alberta and Saskatchewan, too little moisture and fluctuatingmoisture levels are more common than excessive moisture. In Manitoba, the situation is reversed. Toomuch moisture generally causes more problems than too little moisture. Low or fluctuating moisture levelscan contribute to common scab, early dying, hollow heart, knobby tubers, low dry matter, low tuber set,and low yield. Excessive soil moisture resulting in poor aeration and water logging of the soil reducesyields and in extreme cases causes tuber rot. An excess of moisture may also lead to enlarged lenticels,which are openings of the epidermis. This detracts from their appearance and allows entry of diseaseorganisms, causing tuber rot in storage.
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