The changes of weed ecological groups in the winter rye crop grown in different crop rotations (original) (raw)

Zemdirbyste-agriculture, 2009

Abstract

Weed species can be associated with a particular range of conditions, for example pH, site moisture and soil fertility, and on this basis can be given values denoting the position along environmental gradients at which each, on average, reaches peak abundance. The objective of this investigations was to determine the changes of weed ecological groups in the long-term cultivated winter rye (Secale cereale L.) monocrop without / whit fertilization and without / whit spraying with herbicides. The field experiment was established since 1967 and investigations were carried out in 2003 and 2015 at the Experimental Station of Aleksandras Stulginskis University. Soil – Calc(ar)i-Endohypogleyic Luvisol. The treatments of the experiment: 1) without fertilization and spraying with herbicides, 2) with fertilization (N92P45K75) and spraying with herbicides (in autumn – Legacy Pro, 2.0 l ha-1; in spring – Mustang 0.6 l ha-1). The weed classification into ecological groups was done according to Ellenberg et al. (1992). In 2003 in winter rye monocrop without fertilization and spraying with herbicides dominated Apera spica-venti, Viola arvensis, Arenaria serpyllifolia, Equisetum arvense, in 2015 – Tripleurospermum perforatum, Equisetum arvense, Cirsium arvense, Mentha arvensis. In 2003 weed species distributed into 6 ecological groups according to soil pH, into 7 groups according to nitrogen demand and into 5 groups according to soil moisture, in 2015 – into 4 groups according to soil pH, into 6 groups according to nitrogen and into 5 groups according to soil moistureVytauto Didžiojo universitetasŽemės ūkio akademij

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