Graduate Thesis Or Dissertation
 

Growth rate of wheat (Triticum aestivm L., var. Gaines) as a function of moisture stress and nitrogen supply

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  • The effect of moisture stress and nutrients on the rate of growth of wheat (Triticum aestivum L. Var. Gaines) seedlings was studied. A special apparatus in which the moisture stress of several perlite cells could be maintained constant by osmotic solutions was used. Predetermined amounts of nitrogen were added to the osmotic solutions. Leaf area was determined with an air flow planimeter. Dry weight was determined with a Mettler balance after oven drying of the plant material. Total nitrogen concentration of the plants was measured by the micro-Kjeldahl method. In general, with increase in available nitrogen the rates of leaf area increase and accumulation of dry matter increased; the total nitrogen concentration of the plants also increased. The concentration of nitrogen in the plants decreased when there was no nitrogen in the nutrient solution. The increased rate of growth was due to increased efficiency of physiological processes. Rates of leaf area increase and dry matter accumulation were slowed down with increased moisture stress at all moisture levels. Wheat seedling growth was more sensitive to nitrogen deficiency than to lack of moisture. Generally, growth rates decrease more rapidly at low moisture stress than at more severe moisture stress.
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