Effects of Water and Nitrogen Supplementation on Phenology, Plant Size, Tissue Nitrogen, and Seed Yield of Chihuahuan Desert Annual Plants

1989 ◽  
Vol 34 (4) ◽  
pp. 546 ◽  
Author(s):  
Walter G. Whitford ◽  
Julio R. Gutierrez
Keyword(s):  
Seed Yield ◽  
Chihuahuan Desert ◽  
Plant Size ◽  
Annual Plants ◽  
Nitrogen Supplementation ◽  
Desert Annual ◽  
Desert Annual Plants ◽  
Tissue Nitrogen

Effects of Different Patterns of Supplemental Water and Nitrogen Fertilization on Productivity and Composition of Chihuahuan Desert Annual Plants

1988 ◽  
Vol 119 (2) ◽  
pp. 336 ◽  
Author(s):  
Julio R. Gutierrez ◽  
Oswaldo A. Da Silva ◽  
Maria I. Pagani ◽  
Danforth Weems ◽  
Walter G. Whitford
Keyword(s):  
Nitrogen Fertilization ◽  
Chihuahuan Desert ◽  
Annual Plants ◽  
Desert Annual ◽  
Desert Annual Plants

IN MEMORIAM—MICHAEL EVENARI AND HIS DESERT SEED DISPERSAL AND GERMINATION STRATEGIES OF SPERGULAR DIANDRA COMPARED WITH SOME OTHER DESERT ANNUAL PLANTS INHABITING THE NEGEV DESERT OF ISRAEL

1994 ◽  
Vol 42 (4) ◽  
pp. 261-274 ◽  
Author(s):  
Yitzchak Gutterman
Keyword(s):  
Position Effect ◽  
Seedling Emergence ◽  
Survival Strategies ◽  
Annual Plants ◽  
Sinai Peninsula ◽  
Late Professor ◽  
Large Numbers ◽  
In Memoriam ◽  
Desert Annual ◽  
Desert Annual Plants

The late Professor Michael Evenari was a leader and agreat scientist with a very wide view and varied interests. Throughout the 26 years that I studied desert plants with Professor Evenari in the deserts of Israel and the Sinai Peninsula, he liked to summarize the seasonal field observations of seedling emergence with the words, “this particular year is a very special year.” What are the reasons for such species' diversity, and what are the survival strategies of desert annuals'? Some species are common and others emerge only once in several years under unpredictable seasonal precipitation and massive seed consumption by ants. Escape dispersal strategies after maturation of the tiny, long-living seeds, and partial “opportunistic” germination strategies after only 10 mm of rain, are found in some common annuals such as Schismus arabicus and Spergularia diandra. Day lengthing seed maturation, and light and temperatures during seed wetting and germination, also affect their germinability. In S. diandra, nine types of seeds have been found (3 genotypes and 3 color phenotypes), which differ in coat structure, color, and germinability, and in Mesembryanthemum nodiflorum a position effect was found (3 groups of seeds in a capsule). The more opportunities for a small portion of seeds from the seed bank to germinate after several rainfalls, the greater the chances to germinate at suitable rain distribution. This enables these plants to develop and produce large numbers of seeds, even after a number of small rainfalls.

scholarly journals Responses of Desert Annual Plants to Ozone and Water Stress in anin situExperiment

JAPCA ◽  
1988 ◽  
Vol 38 (9) ◽  
pp. 1145-1151 ◽  
Author(s):  
A. Bytnerowicz ◽  
D. M. Olszyk ◽  
C. A. Fox ◽  
P. J. Dawson ◽  
G. Kats ◽  
...  
Keyword(s):  
Water Stress ◽  
Annual Plants ◽  
Desert Annual ◽  
Desert Annual Plants

Genetic diversity of Achillea fragrantissima in Egypt inferred from phenotypic variations and ISSR markers associated with traits of plant size and seed yield

2016 ◽  
Vol 15 (3) ◽  
pp. 239-247 ◽  
Author(s):  
Abdelfattah Badr ◽  
Hanaa H. El-Shazly ◽  
Hanan I. Sayed Ahmed ◽  
Marwa Hamouda ◽  
Eman El-Khateeb ◽  
...  
Keyword(s):  
Seed Yield ◽  
Plant Size ◽  
Issr Markers ◽  
Gulf Of Aqaba ◽  
Phenotypic Traits ◽  
Mountainous Area ◽  
Achillea Fragrantissima ◽  
South Sinai ◽  
Lower Temperature ◽  
High Elevations

Substantial variation in phenotypic traits and ISSR fingerprinting was observed among twenty populations of Achillea fragrantissima (Forssk.) Sch. Bip. in Egypt. Such variation was reflected in the clustering of the examined populations into two major groups: one representing populations in the mountainous area of South Sinai and the other comprising populations growing at low elevations in the middle of Sinai and the desert west of the Suez Canal from Suez in the east to Cairo in the west. Five populations in the eastern part of Sinai near Nuwieba and Taba on the Gulf of Aqaba were loosely assigned to the first group. The populations growing at high elevations in South Sinai, under lower temperature and higher humidity, were characterized by a higher number of total and polymorphic ISSR markers compared with other populations. Unique ISSR markers were more often observed in the fingerprinting of seven populations including five populations growing in the high mountains of Saint Catherine in South Sinai and two populations growing at low elevations but at Wadi Hof south-east of Cairo. Interestingly, unique bands were found in the populations that possessed traits associated with larger plant size and seed yield as well as better vigour. These are important criteria for the selection of A. fragrantissima populations for conservation and sustainable commercial use.

Growth, development and yield of pigeon pea (Cajanus cajan (L.) Millsp.) in the lowland tropics: 5. Effect of planting configuration

1983 ◽  
Vol 101 (2) ◽  
pp. 441-445 ◽  
Author(s):  
T. O. Tayo
Keyword(s):  
Population Density ◽  
Seed Yield ◽  
Cajanus Cajan ◽  
Plant Size ◽  
Pigeon Pea ◽  
Field Trials ◽  
Growth And Yield ◽  
Local Conditions ◽  
Growth Development ◽  
Vegetative Characters

SUMMARYIn two field trials in 1982, the seeds of pigeon pea (cv. Cita-1) were planted at three configurationsof0·6 x 0·2m;0·4 x 0·3 m and 0·35 x 0·35m(on 14 April and 24 June)giving the same projected population density of 83 000 plants/ha for each configuration, in order to evaluate the best planting configuration for maximum productivity of the crop.In the first trial, the 0·35 x 0·35 m configuration developed the highest magnitude of vegetative characters whilst the 0·4 x 0·3 m configuration had the highest number of seed-bearing pods, although seed yield was similar in all the treatments. In the second trial, the 0·4 x 0·3 m configuration developed the highest magnitude of growth and yield characters and thereby out-yielded the other two configurations.The results show that in the early planting of pigeon pea, population density per se is most important in determining seed yield whereas planting configuration also becomes important in late planting where plant size is reduced as a consequence of the prevailing local conditions.

LIVESTOCK ACTIVITY AND CHIHUAHUAN DESERT ANNUAL-PLANT COMMUNITIES: BOUNDARY ANALYSIS OF DISTURBANCE GRADIENTS

1999 ◽  
Vol 9 (3) ◽  
pp. 814-823 ◽  
Author(s):  
Maliha S. Nash ◽  
Walter G. Whitford ◽  
Amrita G. de Soyza ◽  
Justin W. Van Zee ◽  
Kris M. Havstad
Keyword(s):  
Plant Communities ◽  
Chihuahuan Desert ◽  
Annual Plant ◽  
Boundary Analysis ◽  
Desert Annual
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