3 results match your criteria Agronomy Journal[Journal]

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Wheat response to differences in water and nutritional status between zeoponic and hydroponic growth systems.

Agron J 2000 Mar-Apr;92(2):353-60

Lyndon B. Johnson Space Center, NASA, Houston, TX 77058, USA.

Hydroponic culture has traditionally been used for controlled environment life support systems (CELSS) because the optimal environment for roots supports high growth rates. Recent developments in zeoponic substrate and microporous tube irrigation (ZPT) also offer high control of the root environment. This study compared the effect of differences in water and nutrient status of ZPT or hydroponic culture on growth and yield of wheat (Triticum aestivum L. Read More

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December 2000
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Regression models for calculating gas fluxes measured with a closed chamber.

Agron J 1997 Mar-Apr;89(2):279-84

USDA-ARS, North Central Soil Conservation Res. Lab., Morris, MN 56267, USA.

Portable closed chambers provide a valuable tool for measuring crop photosynthesis and evapotranspiration. Typically, the rates of change of CO2 and water vapor concentration are assumed to be constant in the short time required to make the closed-chamber measurement, and a linear regression model is used to estimate the CO2 and H2O fluxes. However, due to the physical and physiological effects the measurement system has on the measured process, assuming a constant rate and using a linear model may underestimate the flux. Read More

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September 1998

Soybean stem growth under high-pressure sodium with supplemental blue lighting.

Agron J 1991 Sep-Oct;83(5):903-6

NASA Biomedical Operations and Research Office, Kennedy Space Center, FL 32899.

High-pressure sodium (HPS) lamps are popular for plant lighting because of their high energy conversion efficiencies. Yet their spectrum has very little blue light (BL), which may cause undesirable morphological responses. To study this, McCall' soybean [Glycine max (L. Read More

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May 1995
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