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The relations between hydration and yield


, : The relations between hydration and yield. Ber Deutsch Bot Ges 70(2): 67-78

Plant osmotic pressure provides a better index of the need for water than any measurement or estimate of soil water. In an experiment in Alberta, crops of lucerne, wheat, barley, oats, sugar beet, and potatoes were watered at specified depletions of available water in the soil. The yields showed no regular relation to the treatment or to the amount of water used, but were closely related to the mean osmotic pressures at successive stages of growth. The development of a water deficit in the plant is divided into 5 phases with progressively more serious effects on growth; between each phase and the next there is a critical osmotic pressure. For optimum growth the osmotic pressure should be kept below the first critical value, which for lucerne is 10 Atm.

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