scholarly journals Global maximization ofJatrophaoil production under semi-arid conditions by balancing vegetative growth with reproductive capacity

GCB Bioenergy ◽  
2018 ◽  
Vol 10 (6) ◽  
pp. 382-392 ◽  
Author(s):  
Yiftach Vaknin ◽  
Uri Yermiyahu ◽  
Asher Bar-Tal ◽  
Yael Samocha
Keyword(s):  
Vegetative Growth ◽  
Reproductive Capacity ◽  
Arid Conditions ◽  
Global Maximization ◽  
Semi Arid

scholarly journals Effect of complementary irrigation on yield components and alternate bearing of a traditional olive orchard in semi-arid conditions

2016 ◽  
Vol 14 (2) ◽  
pp. e1203 ◽  
Author(s):  
Enrico M. Lodolini ◽  
Serena Polverigiani ◽  
Saed Ali ◽  
Mohammed Mutawea ◽  
Mayyada Qutub ◽  
...  
Keyword(s):  
Vegetative Growth ◽  
Yield Components ◽  
Fruit Size ◽  
Olive Tree ◽  
Residual Effects ◽  
Oil Yield ◽  
Alternate Bearing ◽  
Positive Effects ◽  
Arid Conditions ◽  
Semi Arid

Traditional olive orchards are usually not irrigated in the Mediterranean basin, but at those latitudes, the yearly rainfall is frequently insufficient to support equilibrated vegetative growth and high fruit and oil production. This three-year field study investigated the effect of complementary irrigation on olive tree vegetative growth, fruit and oil yield during a biennial alternate bearing cycle in a traditional grove under semi-arid conditions. Adult olive trees (Olea europaea L. cv. Nabali Baladi) were subjected to complementary irrigation in 2011 and 2012 ('on' and 'off' years, respectively) with 6, 10, 15 or 20 m3 of water per tree per season, which corresponded to 14.2%, 23.8%, 35.7% and 47.6% of the whole seasonal evapotranspiration (42 m3 of water per year), respectively. Rain-fed trees were used as control. In 2013, no complementary irrigation was supplied, and any residual effects on the yield components were determined. Results showed that none of the irrigation regimes affected vegetative growth, or olive fruit size (mesocarp and endocarp), as fresh and dry weights. The fruit and oil yield per tree increased compared to the rain-fed conditions only when the threshold of 15 m3 was exceeded, thus inducing a higher crop load compared to the rain-fed control during the 'off' and even further during the 'on' year. No residual effects were registered in 2013. The study showed that complementary irrigation of at least 35% of the seasonal water requirement can produce remarkable positive effects on fruit yield especially during 'on' bearing years.

Growth and N-uptake by wheat as affected by sowing date and nitrogen in irrigated semi-arid conditions

1977 ◽  
Vol 89 (1) ◽  
pp. 35-42 ◽  
Author(s):  
M. A. Khalifa ◽  
M. H. Akasha ◽  
M. B. Said
Keyword(s):  
Leaf Area ◽  
Nitrogen Uptake ◽  
Vegetative Growth ◽  
Sowing Date ◽  
Leaf Expansion ◽  
Nitrogen Application ◽  
Arid Conditions ◽  
Leaf Area Duration ◽  
Semi Arid ◽  
Late Sowing

SummaryField experiments were made under irrigated semi-arid conditions to determine the effects of sowing date and nitrogen application on the growth and yield of wheat and nitrogen-uptake by wheat plants. Early sowing was found to be favourable to high grain production because the post-anthesis period coincided with relatively lower temperatures. Late sowing was unfavourable to grain yields since the period between anthesis and leaf senescence was curtailed by the onset of relatively higher temperature. The benefits from nitrogen were greater with early sowing because of higher nitrogen-uptake during early vegetative growth as a consequence of which, nitrogen was readily available to the plants. This resulted in better leaf expansion, and higher leaf-area indices and leaf-area duration. With late sowing nitrogen-uptake was much lower during early vegetative growth and this resulted in decreased leaf expansion, reduced leaf-area indices and leaf-area duration and therefore diminished response in grain yield to nitrogen application.

Triazine carryover in semi-arid conditions

1990 ◽  
Vol 9 (6) ◽  
pp. 429-432 ◽  
Author(s):  
O.A. Chivinge ◽  
B. Mpofu
Keyword(s):  
Arid Conditions ◽  
Semi Arid

Genetic parameters of Barki sheep raised under semi-arid conditions

1969 ◽  
Vol 11 (3) ◽  
pp. 361-367 ◽  
Author(s):  
M. H. Fahmy ◽  
E. Salah E. Galal ◽  
Y. S. Ghanem ◽  
S. S. Khishin
Keyword(s):  
Genetic Parameters ◽  
Genetic Correlations ◽  
Research Station ◽  
Phenotypic Correlations ◽  
Arid Conditions ◽  
Body Weights ◽  
Genetic And Phenotypic Correlations ◽  
Fleece Weight ◽  
Semi Arid ◽  
Desert Research

SUMMARYRecords on 695 lambs were collected over a period of 5 years from 1961/62 to 1965/66, at Ras El-Hekma Desert Research Station, 230 km west of Alexandria. The characters studied were birth, weaning and yearling body weights, pre- and post-weaning daily gains and greasy fleece weight.Birth, 120-day and 365-day body weights were 3·4, 18·2 and 33·4 kg respectively. Greasy fleece weight at 16 months of age was 3·29 kg. Heritability estimates of birth, weaning, yearling weights, pre- and post-weaning daily gains and greasy fleece weight were 0·22, 0·45, 0·41,0·45 and 0·29 respectively. Genetic and phenotypic correlations between birth, weaning and yearling weights were all positive and significant. Genetic correlations between fleece weight and body characteristics were negative and low.

Competition between maize andDatura stramoniumin an irrigated field under semi‐arid conditions

Weed Research ◽  
1999 ◽  
Vol 39 (3) ◽  
pp. 225-240 ◽  
Author(s):  
Cavero ◽  
Zaragoza ◽  
Suso ◽  
Pardo
Keyword(s):  
Arid Conditions ◽  
Semi Arid

Quantifying risk for water harvesting under semi-arid conditions

2005 ◽  
Vol 76 (2) ◽  
pp. 77-93 ◽  
Author(s):  
M. Tsubo ◽  
S. Walker ◽  
M. Hensley
Keyword(s):  
Water Harvesting ◽  
Arid Conditions ◽  
Semi Arid ◽  
Quantifying Risk

scholarly journals AGRONOMIC EFFICIENCY OF THE INTERCROPPING OF ARUGULA WITH CARROT UNDER DIFFERENT POPULATION COMBINATIONS

2016 ◽  
Vol 29 (1) ◽  
pp. 76-84 ◽  
Author(s):  
THAÍZA MABELLE DE VASCONCELOS BATISTA ◽  
FRANCISCO BEZERRA NETO ◽  
ÍTALO NUNES SILVA ◽  
MAIELE LEANDRO DA SILVA ◽  
ELIANE QUEIROGA DE OLIVEIRA ◽  
...  
Keyword(s):  
Experimental Design ◽  
Maximum Yield ◽  
Population Densities ◽  
Agronomic Efficiency ◽  
Green Mass ◽  
Sole Crop ◽  
Arid Conditions ◽  
Caatinga Biome ◽  
Brazilian Northeast ◽  
Semi Arid

ABSTRACT: The objective of this study was to evaluate the agronomic efficiency of intercropping combinations of carrot and arugula at different population densities in bicropping in the semi-arid conditions of the Brazilian Northeast. The study was conducted at the "Rafael Fernandes" Experimental Farm of the Universidade Federal Rural do Semi-Árido (UFERSA) during the period September 2011 to February 2012. The experimental design was of randomized complete blocks with treatments arranged in a 4 x 4 factorial scheme with four replications. The combinations were four population densities of carrot (40, 60, 80 and 100% of the recommended population in sole crop - RPSC) with four population densities of arugula (40, 60, 80 and 100% of the RPSC). The recommended population densities for sole crops of carrot and arugula are 500,000 and 1,000,000 plants per hectare, respectively. All treatments were fertilized with hairy woodrose (Merremia aegyptia L.), a spontaneous species of the Caatinga biome. The highest agronomic efficiency of carrot intercropped with arugula in bicropping was achieved in the combination of 40% of RPSC for the carrot and 100% of RPSC for the arugula. The commercial maximum yield (33.74 t ha-1) of carrot roots and the maximum yields of arugula green mass (8.06 and 2.67 t ha-1) in both cultivations were also obtained in the combination of population densities of 40% of RPSC for carrot and 100% of RPSC for arugula.

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