WATER AS A FACTOR IN AND REGULATOR OF PLANT DEVELOPMENT IN FIELD CONDITIONS
Main researcher
: ČAVLEK, MIROSLAV (85901) Assistants
MARIĆ, DRAHOMIRA (28380)
KOSTIĆ, SLAVKO (22460)
BAJTEK, MILAN (111492)
BERDIN, MARIJAN (137096)
DELAČ, SMILJAN (137074)
BUŽANČIĆ, ANDRIJA (6414)
Type of research: applied Duration from: 02/01/93. to 02/01/03. Papers on project (total): 0
Institution name: Duhanski institut, Zagreb (92)
Communication
Phone: 385 (0)1/228-222; 228-225
Fax: 385 (0)10/232-850
Summary: The research, which will be carried out over a number of
years, will cover all the problems relating to the irrigation of tobacco
and of some crops that can be grown in crop rotation with tobacco (wheat,
barley, hemp, flax, soybeans, chamomile). The aim of the research will be
not only to provide results that can be applied in practice, but also to
establish and/or confirm theoretical explanations of the significance of
water in plant physiology as well as the entier soil-water-plant
relationship. Furthermore, the research will be aimed at explaining the
mechanism and intensity of nutrient utilization in connection with the
amounts of water in the individual phenophases of tobacco development.
Parameters will be established for the evaluation of the tobacco maturity,
the chemical composition of the leaf, tobacco-specific components and their
dependence on the availability and amounts of nutrients in the soil, the
intensity of photosynthesis and the amount of water in the various stages
of plant development. The economic results will be analyzed (the need for
irrigation, the choice of crops preceding tobacco). The research will be
confirmed by exact field experiments on the experimental plot of the
Tobacco Institute in Pitomaca, along with laboratory analyses of the soil
and the chemical composition of the plant material in the Institute's
laboratories in Zagreb.
Research goals: 1. To investigate the influence of the amount of
water on thegrowth, development and metabolism of plants; 2. To
investigated and explain the role of the enzymenitrate-reductase in
tobacco nutrition; 3. To determine the intensity of tobacco photosynthesis
under theconditions prevailing in north-west Croatia; 4. To study the
processes of plant againg and determine theparameters for evaluating
maturity; 5. To investigate the activity of the enzyme
nitrate-reductase,nutrient utilization, photosynthesis, and the
technologicalmaturity of tobacco depending on the amount of water in
thestages of development; 6. To investigate the dynamics of mineralization
of organicmatter in the soil in connection with fertilization and
nutrientleaching (the ecological approach); 7. To investigate the content
of raw smoke condensate in tobacco(health); 8. To establish the crop
rotation and the method of growing thepreceding crop, which is subordinate
to tobacco; 9. To establish the economic justification of irrigation
andinvesting into irrigarion systems for tobacco and the prcedingcrops in
crop rotation, and, on this basis, the choice of cropsfor crop rotation.
The major contributions made by the results of this project willbe the
gollowing: - scientific knowledge about the significance of water in
plant(tobacco) physiology, knowledge about the way the activity of
theenzyme nitrate-reductase influences nutrient utilization andknowledge
about the dependence of enzyme activity andphotosynthesis on starch
accumulation and chlorophylldecomposition, - knowledge about the rate and
intensity of the decomposition oforganic matter in the soil and nitrogen
leaching, - knowledge about the soil-water-plant relationship and
thepractical application of this knowledge in the irrigation system, -
establishing a scientific basis on which to solve moreeconomically some
practical problems relating to irrigation andcrop rotation, - tobacco
growing with less pollution of the environment and lessdanger to health. Other information about the project.