Effect of Pozzolan and Nitrogen Fertilizer in Reducing Irrigation Water and Soil Moisture Stress in Three Eggplant Cultivars (solanum melongina)

2012 ◽  
Vol 23 (2) ◽  
Author(s):  
Samir. Al-Solimani ◽  
Saleh Byari
Keyword(s):  
Soil Moisture ◽  
Nitrogen Fertilizer ◽  
Irrigation Water ◽  
Moisture Stress ◽  
Soil Moisture Stress

Effects of nitrogen deficiency and soil moisture stress on growth of pasture grasses at Samford, south-east Queensland. 1. Results of field experiments

1963 ◽  
Vol 3 (11) ◽  
pp. 300 ◽  
Author(s):  
EF Henzell ◽  
GB Stirk
Keyword(s):  
Soil Moisture ◽  
Nitrogen Fertilizer ◽  
Field Experiments ◽  
Nitrogen Deficiency ◽  
Moisture Stress ◽  
Soil Moisture Stress ◽  
Nitrogen Response ◽  
Rhodes Grass ◽  
Supplementary Irrigation ◽  
Grass Growth

Two field experiments were carried out at Samford during 1958, 1959, and 1960 using three grasses, nitrogen fertilizer, and supplementary irrigation. Attention was concentrated on grass growth during September to December, a period that is particularly important for livestock that have been grazed on poor quality feed during winter. Nitrogen deficiency was more important than soil moisture stress in limiting growth of grass under natural rainfall. Nitrogen fertilizer caused large increases in yield each year, and maximum yields above 10,000 lb of d y matter an acre were produced by uninterrupted growth up to December or January-four or five times the yields of the unertilized plots. Differences between the yields of the three grasses were small compared with the size of the nitrogen response. In the spring of 1960-61, which was the driest of the three seasons during this investigation, soil moisture stress reduced growth of nitrogen-fertilized Rhodes grass (Chloris gayana Kunth.) up to mid-December one-third. It was observed that fertilized Rhodes grass withdrew water more rapidly and to a greater depth than Rhodes grass without added nitrogen.

scholarly journals Improved understanding of drought controls on seasonal variation in Mediterranean forest canopy CO<sub>2</sub> and water fluxes through combined in situ measurements and ecosystem modelling

2009 ◽  
Vol 6 (8) ◽  
pp. 1423-1444 ◽  
Author(s):  
T. Keenan ◽  
R. García ◽  
A. D. Friend ◽  
S. Zaehle ◽  
C. Gracia ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Forest Canopy ◽  
Moisture Stress ◽  
Mediterranean Ecosystems ◽  
Forest Growth ◽  
Water Fluxes ◽  
Soil Moisture Stress ◽  
Dynamic Global Vegetation Model ◽  
Forest Growth Model

Abstract. Water stress is a defining characteristic of Mediterranean ecosystems, and is likely to become more severe in the coming decades. Simulation models are key tools for making predictions, but our current understanding of how soil moisture controls ecosystem functioning is not sufficient to adequately constrain parameterisations. Canopy-scale flux data from four forest ecosystems with Mediterranean-type climates were used in order to analyse the physiological controls on carbon and water flues through the year. Significant non-stomatal limitations on photosynthesis were detected, along with lesser changes in the conductance-assimilation relationship. New model parameterisations were derived and implemented in two contrasting modelling approaches. The effectiveness of two models, one a dynamic global vegetation model ("ORCHIDEE"), and the other a forest growth model particularly developed for Mediterranean simulations ("GOTILWA+"), was assessed and modelled canopy responses to seasonal changes in soil moisture were analysed in comparison with in situ flux measurements. In contrast to commonly held assumptions, we find that changing the ratio of conductance to assimilation under natural, seasonally-developing, soil moisture stress is not sufficient to reproduce forest canopy CO2 and water fluxes. However, accurate predictions of both CO2 and water fluxes under all soil moisture levels encountered in the field are obtained if photosynthetic capacity is assumed to vary with soil moisture. This new parameterisation has important consequences for simulated responses of carbon and water fluxes to seasonal soil moisture stress, and should greatly improve our ability to anticipate future impacts of climate changes on the functioning of ecosystems in Mediterranean-type climates.

scholarly journals Erratum: Effect of soil moisture stress from flowering to grain maturity on functional properties of Sri Lankan rice flour

2011 ◽  
Vol 63 (6) ◽  
pp. 392-392 ◽  
Author(s):  
Anil Gunaratne ◽  
Upul Kumari Ratnayaka ◽  
Nihal Sirisena ◽  
Jennet Ratnayaka ◽  
Xiangli Kong ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Functional Properties ◽  
Rice Flour ◽  
Moisture Stress ◽  
Sri Lankan ◽  
Soil Moisture Stress

EFFECTS OF SOIL MOISTURE STRESS ON CARBOHYDRATE DEVELOPMENT AND GROWTH IN PLANTS

1954 ◽  
Vol 41 (4) ◽  
pp. 316-320 ◽  
Author(s):  
Dorothy H. Woodhams ◽  
Theodore T. Kozlowski
Keyword(s):  
Soil Moisture ◽  
Moisture Stress ◽  
Soil Moisture Stress
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