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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Characterisation of storage lipid accumulation in developing fruits and cell cultures of coriander

Bowra, Steve January 1998 (has links)
No description available.
12

Effect of nitrogen and water stresses during tillering and grain- filling in wheat

Ashraf, Muhammad, 1952- 11 September 1992 (has links)
The CERES-Wheat Crop Growth and Development model treats temperature, nitrogen and water stresses as limiting factors. For each day the model calculates a stress index for temperature, N and water, compares the magnitude of the indices, and then adjusts the calculated daily potential growth using the index of the most severe stress, while ignoring the other stresses. Under the conditions in Oregon, however, mild N and water stress will often be present together in about equal degree of stress. Some published results suggest that both stresses affect growth and yield under those conditions. Therefore, this work was undertaken to evaluate the combined effects of N and water stress on growth and development of wheat (Triticum aestivum L.). To make such an evaluation one must be able to control both N and water supplies to the plant and the response of the plant to these two variables must be measured at different growth stages. A system of imposing controlled plant water stress developed by Snow and Tingey (1985) was adapted and evaluated for its potential to impose controlled levels of both N and water stress to single wheat plants. Using a 12 mmol N and 4 cm pathlength as optimum N and water supply treatment, 2 mmol N and 12 cm pathlength and a 1 bar standard ceramic disc in the floral foam column as N and water stress treatments during tillering resulted in 15 % reduction in tillers/plant for limits to the N supply alone, a 39 % reduction for limits to the water supply alone, and a 52 % reduction when both stresses were imposed simultaneously. There was no effect of N or water supply treatments on the leaf appearance rate on the main stem, a measure of the rate of progress toward flowering. Both N and water supplies had a strong effect on tillers/plant which, in turn, affected plant biomass and its constituent parts. The effects were independent, suggesting that, to accurately model the wheat canopy development when both mild N and water stresses are present, both stresses must be considered. A 'law of minimum' concept as currently used in the CERES-Wheat model would not be an accurate model for the process of tillering. In an experiment where stress was imposed during flowering and grain-filling, the grain yield/plant varied significantly with both N and water supplies. The interaction between N and water treatments on grain yield was also significant and was due primarily to their significant interaction on mean kernel weight. The major determinant of grain yield was tillers/plant at harvest. Both N and water supplies affected kernels/ear and N stress caused a reduction of 12% in both fertile spikelets/ear and kernels/fertile spikelet. At an optimum water supply, the difference between the effect of optimum and medium N supply on grain yield was not significant but yield in low N supply was reduced by 54%. In the medium water supply, the grain yield at both medium and low N treatments were significantly lower than at optimum N supply. There was no significant difference in yield between N supply treatments in the low water supply treatments. Thus, under severe water stress, a 'law of minimum' concept appeared to be valid, but under less severe stress both N and water supply affected grain yield. The data on leaf water potential and leaf temperature showed that plants in low water supply treatments maintained consistently lower leaf water potential and higher leaf temperature than in optimum water supply treatment. / Graduation date: 1993
13

CERTAIN FACTORS AFFECTING THE UPTAKE OF PHOSPHORUS, CALCIUM, AND STRONTIUM BY THREE TEST CROPS

Riley, William Frederick, 1912- January 1958 (has links)
No description available.
14

Response of field crops to certain soil conditioners

Schreiber, Marvin M. January 1951 (has links)
No description available.
15

Scutellonema bradys as a pathogen of yam in Benin

Baimey, Hugues Kossi. January 2006 (has links)
Thesis (Ph.D.)(Microbiology and Plant Pathology)--University of Pretoria, 2006. / Includes summary. Includes bibliographical references. Available on the Internet via the World Wide Web.
16

An investigation of weather data as it pertains to crop drying

Zachariah, Gerald Leroy January 2011 (has links)
Digitized by Kansas State University Libraries
17

Biological variation and chemical control of Rhizoctonia solani causing rice sheath blight disease in Bangladesh

Ali, Md. Ansar January 2002 (has links)
No description available.
18

The effects of molluscicides on the abundance and distribution of ground beetles (Coleoptera, Carabidae) and other invertebrates

Kennedy, Peter John January 1990 (has links)
No description available.
19

Use of genetic modification to produce novel starch phenotypes in wheat (Triticum aestivum L.)

Woplin, Rachel Elspeth January 2000 (has links)
No description available.
20

Remote sensing methods for the site-specific management of cereal

Wood, Gavin Adam January 2002 (has links)
No description available.

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