Priešsėlių įtaka žieminių rugių agrocenozei

Abstract

The investigations were carried out over the period of 2010-2011 at the experimental station of the aleksandras stulginskis on an endocalcari - Epihypogleuic Cambisol. Crop rotations: I - mono crop, II - three field, III - field whit row crop, IV - field whithout row crop, V - intensive, VI - sideral. The objective of this investigations was estimate the weediness of winter rye (secale cereale 1.) in different crop rotations after various pre-crops, soil enzyme activity and biological grain yield. The highest dry matter mass of weeds were established in the winter rye crop grown after winter rape for green manure (sideral crop rotation). The dry matter mass of weeds increased from 3.4 to 18.2 times compared with the other crop rotations, the lowest activity of urease and saccharase was abstained in the soil of the tree-field crop rotation, where the pre-crop of winter rye was black fallow. Other pre-crops of winter rye trended to stimulate the soil enzyme activity. The highest winter rye biological grain yield was established in the eight field with row crop rotation, where the pre-crop of winter rye was perennial grasses of the 2st year of use. The biological grain yeld of winter rye increased from 39.8 to 63.7.% compared with the other crop rotations.