Effect of biological preparations and nitrogen fertilization on soil in winter wheat crops

Leidinio DOI: https://doi.org/10.7220/1822-9913.2021The research was caried out in 2020 at the Vytautas Magnus University Agricultural Academy Experimental Station. The aim of the research was to study the influence of biological preparations and fertilization with different nitrogen rate on soil in winter wheat crop. Experiment Variants: Factor A – Nitrogen fertilization: 1) N105 fertilized, 2) N165 fertilized; Factor B – biological preparation: 1) not used preparation, 2) Preparation A (2 l ha-1), 3) Preparation B (2 l ha-1). Preparation A was made from molasses with lactic acid bacteria and and B contained molasses with amino acids. Preparations was sprayed in 2019 autman on stubble. Soil limnoglacial loam on moraine loam is a carbonating deep glial loam (Calcari-Endohypogleyic Luvisol). The uses of biological preparation A and fertilization with nitrogen N105 and N165 norms resulted in a significantly (P < 0.05) higher (62.5% and 51.4%) amount of persistent soil aggregates compared to the persistence of soil in fields fertilized with N165 where biological preparations were not used. Biological preparation B significantly redused the amount of micro structural aggregates in the soil by fertilizing winter wheat with nitrogen N105 rate. Preparation A significantly incresed the amount of micro aggregates in the soil when the nitrogen fertilizer rate was N165. The use of biological preparations and fertilization with nitrogen N105 rate significantly (P < 0.05) increased the humus content in the soil compared to the humus content in the soil fertilizesd with N165Agronomijos fakultetasVytauto Didžiojo universiteta