Subject this resent study is evaluation of productivity of seed-forage crop rotation from cerealleguminous mixture-cereals-cereals type (barley-mixture+barley-wheat-oats). The field trial has been carried out on non-irrigated conditions on Haplic Vertisols over the period 2005-2008. It has been studied the influence of three-nitrogen fertilization: rates T_0-without fertilization, T_1-reduced from optimal rate, T_2-optimal fertilization rate. Two variants of soil tillage are tested: O_1-plouging with turning the till layer on 18-20 cm and O_2-loosening of 18-20 cm. Disking of the wheat, barley and oats on 10-12 cm. The aim of this study is to determine the influence of different levels of nitrogen fertilization and soil tillage on the productivity of field crops alternately in time and space in crop rotation in agroclimatic conditions on Haplic Vertisol in Sofia region-Bozhurishte. Since this study was found that mineral fertilization increased productivity of crops grown in rotation from 32% to 94% under the particular agrotechnical and meteorological conditions. The autumn soil tillage affects the productivity of spring mix, while has no direct impact on the winter wheat.
展开▼
