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The change of parameters of carbonate chernozem fertility and sunflower plants productivity under the influence of fertilizers in crop rotation

Author: Stefanov Ivan
Degree:doctor of agriculture
Speciality: 06.01.04 - Agrochemistry
Scientific adviser: Constantin Zagorcea*
doctor habilitat în agricultură, profesor universitar,
Scientific consultant: Valentin Ungureanu
doctor habilitat, professor, Agrarian State University of Moldova
Scientific council:


The thesis was presented on the 9 November, 2007
Approved by NCAA on the 28 February, 2008


Adobe PDF document0.30 Mb / in romanian
Adobe PDF document0.35 Mb / in russian


CZU 631.816:631.45:633.854.78

Adobe PDF document 1.19 Mb / in russian
139 pages


Soil, fertilizer, carbonate black soil, manure, sunflower, harvest, quality, nitrogen, phosphorus, potassium, nitrates, microbe biomass


The change of carbonate chernozem fertility and special features of supplying and reaction of sunflower-plants at their cultivation in a crop rotation in last culture in conditions of carbonate chernozem, manure and mineral fertilizers in various combinations and doses, also their affection at separate and joint long (since 1963) and their regular use with the cultures in 6-fields crop rotation are investigated.

Fertilizers were put in the basic processing of ground in autumn. The technology of ground in autumn. The technology of sun flower cultivation recommended for this region and accepted for the central zone of Republic of Moldavia was the basic background.

The following experimental data are presented in the scientific work according to: the existence and reserve in the layer of 0-60 cm; differently fertilized soils on phases of vegetation of sunflower plants, general and productive moisture, nitrates, mobile forms of phosphorus and potassium; the existence and reserve of humus, number of earthworms, rates of mineralization of flax in differently fertilized soil, also the plant development, seed productivity and vegetative mass; the parameters of quality of seeds to contents of crude fiber and crude fat in seeds; the NPK contents in the seeds and vegetative mass and their carrying out, the experimental date on microbiological soil activity are given. The economic estimation of researched variants and norms, correlation and combinations of manure mineral fertilizers to the researched culture of given.

It is established that the used fertilizers promote the improvement of water and nutritious regime of soil, improvement of efficiency of soil carbonate fertility and in some variants to the improvement of activity of soil mikroflara that affects the level of potential fertility of the researched soil and productivity of cultivated culture. In average on humid and drough and years the sunflower plants are reacted well to the influence and further action of manure and combination of NPK in the lowered doses. The fertilizer used has essentially increased the productivity of cultivated culture and its quality.

It is revealed that economically it is more favorable to bring under only the nitrogen-phosphoric fertilizers in dose of N50-75P25-28 kg of active substance, and also the use of further action of organic fertilizers.