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  • Tulip bulbs preparation by heat treatment for forced culture in green house
    70-72
    Views:
    71

    Tulip can be grown in parks as ornamental plant and cut flowers, or possibly in protected areas for cut flowers during winter and early
    spring.
    An important condition for the successful cultivation of tulips is the quality of the bulbs that are going to be planted and their
    biological preparation.
    Under the quality aspect bulbs have to be uniform and large, preferably with circumference greater than 11 cm and must have good
    phytosanitarical status.
    Preparation of organic bulbs for ensuring the continuation of the differentiation process of germs (floral), is made during the storage.
    It is known that the preparation of organic bulbs are made in interaction with environmental factors, among which temperature plays an
    important role. At the beginning and throughout the process of biological preparation, temperature is maintained at a higher level then the
    temperature must be low until planting.
    The temperature level and the duration of treatment varies by followed objective respectively early or late flowering and staggered
    flowers production over a longer period of time.

  • Grain yield and quality of maize hybrids in different FAO maturity groups
    126-131
    Views:
    63

    An improvement in the quality of maize grain by increasing the level of components responsible for its biological value is possible
    by using genetic means. However, a change in the genotype, together with improving the nutrient properties of the grain, also has some
    adverse consequences connected with a fall in yield and in resistance to diseases.
    Field experiments were conducted during three years (2003, 2004and 2005) to evaluate environmental effects on grain yield and
    quality responses of maize hybrids. Twenty one hybrids of various maturity groups (FAO 150-400) were planted to achieve an optimum
    (60-70 000 plants per hectare) plant populations and grown under the medium-N (80 kg N ha-1) fertilization. Environmental conditions
    significantly affected maize hybrid responses for grain yield, starch, oil and protein contents, and consequently, starch, oil and protein
    yields per hectare. Hybrids of flint type, which have a short vegetation period, had high protein and oil content but the yield averages
    were low due to the slower rate of starch incorporation. Hybrids of the dent type have a longer growing season and more intense
    carbohydrate accumulation, but low protein and oil contents. In wet years there was a higher rate of starch accumulation, while dry
    years are favorable for protein and oil accumulation. Positive correlation existed between starch content and grain yield and 1000-
    weight as well as between oil content and volumetric weight among tested hybrids. Negatively correlation existed between grain oil and
    starch content as well as between oil content and grain yield and 1000-weight. Thus, end-users that require high quality maize may need
    to provide incentives to growers to off set the negative correlation of grain yield with oil and protein content.