Some characteristics of the germination of Queensland blue grass on cracking black earths

1978 ◽  
Vol 29 (6) ◽  
pp. 1147 ◽  
Author(s):  
LA Watt
Keyword(s):  
Water Availability ◽  
Field Conditions ◽  
Adaptive Mechanism ◽  
Surface Layers ◽  
Large Numbers ◽  
Actual Field ◽  
Germinated Seeds

An intermediate stationary stage in the germination of Queensland blue grass (Dicanthium sericeum L.) caused by limiting water availability was examined. It was found that partially germinated seed can maintain viability over extended periods of desiccation and that large numbers of these partially germinated seeds are found under simulated and actual field conditions. Results indicate that this phenomenon is an adaptive mechanism which assists establishment on black cracking earths in which rapid drying of surface layers is characteristic.

Movement of salts in isolated soil columns.

1953 ◽  
Vol 4 (1) ◽  
pp. 82 ◽  
Author(s):  
ES West ◽  
A Howard
Keyword(s):  
Water Table ◽  
Salt Concentration ◽  
Sandy Loam ◽  
Field Conditions ◽  
Lateral Movement ◽  
Soil Columns ◽  
Surface Layers ◽  
Salt Accumulation ◽  
Arid Soil ◽  
Semi Arid

Movement of salt in a semi-arid soil (Hanwood sandy loam) was studied in isolated columns of soil one metre in diameter and four metres deep. Where a water-table was maintained approximately 60 cm. from the surface by the addition of rain-water to the surface, salt was washed out of the surface layers and did not return. Where a water-table was maintained one metre from the surface by the addition of water from below there was a small increase in the salt concentration of the surface 10 cm. of soil. In view of these results it is suggested that some circulation of water involving lateral movement is generally associated with salt accumulation that is commonly found under field conditions.

Effects of soil moisture and temperature on seedling emergence from natural and pre-germinated onion seeds

1986 ◽  
Vol 107 (2) ◽  
pp. 249-256 ◽  
Author(s):  
W. E. Finch-Savage
Keyword(s):  
Soil Moisture ◽  
Water Availability ◽  
Seedling Emergence ◽  
Moisture Stress ◽  
Start Time ◽  
Mean Temperature ◽  
Changing Patterns ◽  
Moisture Conditions ◽  
Germinating Seeds ◽  
Germinated Seeds

SummaryThe emergence of seedlings from natural, germinating and selected uniformlygerminated onion seeds was compared in a range of changing patterns of soil moisture. The timing, spread and amount of seedling emergence from seeds in all three treatments were affected by the timing of water availability in the seed bed and these effects differed between treatments.The rate of seedling emergence in all three treatments under non-limiting soil moisture conditions was correlated with mean temperature, but this relationship was obscured in irrigation treatments where water stress occurred. However, if the seed bed was moist at sowing irrespective of subsequent moisture stress the reciprocals of the time to the start, time to 50% and time to the end of seedling emergence from uniformly germinated seeds were correlated with mean temperature (r > 0·87, D.F. 27).The results show that if the seed bed is irrigated prior to sowing and soil moisture is maintained during the first 3 days following sowing high levels of seedling emergence with both predictable timing and uniformity can be achieved by sowing uniformlygerminated seeds. Seedling emergence from natural and germinating seeds was much less predictable.

Effect of Water Table Depth on the Yield of Seven Sugarcane Varieties in Puerto Rico

1969 ◽  
Vol 60 (2) ◽  
pp. 228-237
Author(s):  
Raúl Pérez Escolar ◽  
William F. Allison
Keyword(s):  
Puerto Rico ◽  
Water Table ◽  
Commercial Production ◽  
Water Table Depth ◽  
Field Conditions ◽  
Sugarcane Varieties ◽  
Effect Of Water ◽  
Actual Field ◽  
Response To Water

The effect of water table depth on yield of sugarcane varieties PR 980, PR 1028, PR 1059, PR 1141, PR 64-610, PR 61-632 and PR 64-2705 was studied in lysimeter tanks in the field. Using plastic drains at varying distances and depths, variety PR 980 was studied on a 5-ha farm. Results obtained show that varieties differ in their response to water table conditions. Varieties PR 980, PR 1059, PR 64-610, PR 61-632 and PR 64-2705 yielded significantly more cane and sugar when the water table was lowered. Varieties PR 1028 and PR 1141 did not show statistically significant differences among treatment differentials. Under actual field conditions, using perforated plastic drains, variety PR 980 yielded significantly more sugar than in undrained plots. The results obtained in the lysimeter tanks are in accord with those observed under commercial production.

The transfer of fluorine in the soil–wheat system and the principal source of fluorine in wheat under actual field conditions

2012 ◽  
Vol 137 ◽  
pp. 163-169 ◽  
Author(s):  
Cheng Wang ◽  
Zhongfang Yang ◽  
Lingxiao Chen ◽  
Xuyin Yuan ◽  
Qilin Liao ◽  
...  
Keyword(s):  
Field Conditions ◽  
Principal Source ◽  
Actual Field ◽  
Soil Wheat

Selenium supplementation of Portuguese wheat cultivars through foliar treatment in actual field conditions

2012 ◽  
Vol 297 (2) ◽  
pp. 227-231 ◽  
Author(s):  
Catarina Galinha ◽  
Maria do Carmo Freitas ◽  
Adriano M. G. Pacheco ◽  
José Coutinho ◽  
Benvindo Maçãs ◽  
...  
Keyword(s):  
Selenium Supplementation ◽  
Field Conditions ◽  
Wheat Cultivars ◽  
Foliar Treatment ◽  
Actual Field

scholarly journals MATHEMATICAL SIMULATION OF BOTTOM SEDIMENT MOTION BY WAVES

1966 ◽  
Vol 1 (10) ◽  
pp. 43 ◽  
Author(s):  
J.W. Kamphuis
Keyword(s):  
Mathematical Model ◽  
Bottom Sediment ◽  
Mathematical Simulation ◽  
Wave Action ◽  
Field Conditions ◽  
Uniform Size ◽  
Actual Field ◽  
Horizontal Bottom

A mathematical model is developed to calculate the amount of bottom sediment moved by wave action. The simplified case of a horizontal bottom and spherical material of uniform size is presented here; however, with some further groundwork it is thought that the model may be extended to actual field conditions without too much difficulty.

VEHICLE BORNE INSTRUMENT FOR CONTINUOUSLY INDICATING ROAD ELEVATIONS

Geophysics ◽  
1947 ◽  
Vol 12 (3) ◽  
pp. 432-442
Author(s):  
D. Silverman ◽  
J. D. Eisler ◽  
J. F. Evans
Keyword(s):  
Survey Data ◽  
Field Conditions ◽  
Moving Vehicle ◽  
Actual Field ◽  
Electromechanical Device

An electromechanical device mounted in a moving vehicle capable of indicating differences in elevation between successive points along a traverse is described. Principle of operation, constructional details and operating techniques are treated at length. Examples of elevation survey data obtained with the instrument under actual field conditions are presented.

Effect of Freshening Tools and Freshening Intervals on Resin Yield from Pinus caribaea using Bore Hole Method of Resin Tapping

2015 ◽  
Vol 22 (1) ◽  
pp. 1-6
Author(s):  
Niranjan Prasad ◽  
S. Sharma ◽  
S. Pandey ◽  
Amit Kar
Keyword(s):  
Field Conditions ◽  
Pinus Caribaea ◽  
The Third ◽  
Appreciable Increase ◽  
Different Types ◽  
Actual Field ◽  
User Friendly

Different types of freshening tools developed were evaluated in actual field conditions for resin tapping from Pinus caribaea trees. The developed tools were user friendly. The tools were evaluated for freshening holes made for tapping resin using bore hole technique from P. caribaea. Use of all the developed freshening tools led to increase in resin yield over control. Out of different freshening tools developed and tested, hand operated augur type tool showed appreciable increase in resin yield up to the third freshening and is recommended for use in the resin tapping operation of bore hole technique to enhance resin yield.

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