THE INFLUENCE OF INTER-ROW-CULTIVATION ON THE YIELDS OF SUGAR-BEET UNDER IRRIGATION ON THE LIGHT-TEXTURED SOILS

In field polyfactorial trials on light-textured sandy-loam soils the influence of intertillage was subjected to investigations (k0 - the mere weeding before singling and loosening at singling, k1 - equal to k0 + two weedings and one hoeing) at different water regime of soil (V0 - without irrigation, V1 - irrigation on 40% of VVK) and a different nitrogen fertilization (h1 - 120 kg per ha, h2 - 240 kg per ha) on the root and trash yields and the development of soil moisture in the treatments with no irrigation. The intertillage soil loosening exhibited the higher positive effect under the conditions with no irrigation when sugar beet yields increased by ca 8% and in some years even by 16% in the treatments with hoeing on an average for the years. The intertillage influenced the sugar beet root yields less on an average for the years under the conditions of irrigation and amounted to only 4% with high variations in the year. A positive interaction of intertillage with nitrogen fertilization was confirmed. Intertillage influenced the water content on light-textured soils only in arid years.