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Agronomical efficiency of nitrogen - zinc fertilizer

100%
Zinc significantly affected com grain yield production and com grain nitrogen substance contents, on the low and idle soil zinc content. Zinc overdose (6 kg per hectare) leads to the decrease of yields in both years. The zinc dosage of 1.5 kg per hectare seems to be the most optimal from the standpoint of yield formation, nitrogen substance, grain content and economic efficiency.
During 2 years of field nutrition experiments, using loamy brown soil, the effect of the foliar application of manganese, boron as well as the stimulating effect of sodium humate on the potato yield and nitrate content (potato variety Sant×) was investigated. The action of microelements (Mn, B) showed an increase by 11,7 to 15,7% in the potato yield and nitrate content (potato variety Sant×) without having any significant effect on the nitrate content in potato tubers. The joint application of microelements (Mn, B) together with sodium humate increased the potato yield by 17,8 to 23,6% with increasing the nitrate content by 26,6 to 33,8% in potato tubers. The economic efficiency of the nutrition applied was very positive.
In this paper two-year results of field experiment with sugar beet arranged in four treatments and four replications are presented. The fertilizing effects of biosludge (by product of biogas production by continual anaerobic fermentation of animal and plant wastes) on the content of N-NH₄⁺, N-NO₃⁻ in soil profile of 0.0-0.6 m as well as on content of sugar, á-amino N, production of refined sugar and yields of roots was investigated and compared with treatments fertilized with mineral fertilizers and farm-yard manure. High levels of inorganic nitrogen (Nan) in soil in the final part of the growing season tended to cause a higher content of α-amino N in beet roots. The content of Nan and N-NO₃⁻ in soil at the final part of the growing season was markedly influenced by the amount and distribution of precipitation in experimental years. A strong deficit of precipitation in July and August caused nitrates accumulation in soil resulting in a high supply of Nan in soil in final part of the growing season with dominance of nitrate form of nitrogen. On the contrary, an intense precipitation in July and high uptake of nitrogen by plants in the following period caused marked reduction of Nan content in soil with especially low content of N-NO₃⁻ form of nitrogen in the final part of growing season. A potential danger of environmental pollution with nitrogen (especially underground water pollution with N-NO₃⁻) under biosludge application is not great and reaches the level corresponding to the application of common rates of FYM. The application of biosludge positively influenced yields of roots, production of refined sugar and digestion.
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