A task force for scientific and technical aid to agriculture, formed by
the government at the end of 1965, uncovered the appearance and rapid
dispersion of new grain diseases. Dry rot, which had assumed significant
proportions in 1961, caused the most severe losses of wheat in 1970 and
1971, when 1.2 million acres were affected by the disease, mainly in the
northern grain-growing part of the country. Wheat flower blight, long
known in Bulgaria, became particularly widespread in 1965 after the
introduction of a new wheat variety highly susceptible to that disease.
Losses from this source reached about 15 to 20 percent.
Propagation of diseases has been aided by faulty cultivation practices.
Excessively heavy seeding has been used increasingly to compensate for
inadequate soil preparation. The resultant overly thick stands of grain
are prone to lodging, which facilitates the spread of disease through
greater contact of the wheatstalks. The tendency to lodging and, thus,
to the spreading of disease is also encouraged by the improper use of
fertilizers. To compensate for the shortage of phosphatic fertilizers an
erroneous practice has developed of increasing the application of
nitrogenous fertilizers, thereby upsetting the proper balance of plant
nutrients. The resultant excessive vegetative growth weakens the grain
stalks and induces lodging of the grain. Lodging also causes heavy
losses through the germination of kernels and through major difficulties
in harvesting.
Damage to wheat and barley crops from improper use of phosphatic
fertilizers has also been reported. Substantial losses have been
incurred in the production of sunflower seeds through inexpert use of
fertilizers and insecticides, inadequate thinning and weeding, improper
crop rotation, and poor harvesting methods. The basic underlying cause
of these difficulties is the widespread lack of familiarity with modern
production methods and the inadequate supply of technically trained
personnel to guide farmers.
Livestock and Livestock Products
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