Dynamika růstu a změny kvality cukrovky po mimokořenové výživě

Abstract

The effect of extra-root nutrition on sugar beet growth and development during vegetation period was examined in field trials. Simultaneously, yield and technological quality of tubers were evaluated. Sugar beet leaf area was increasing until August when it reached 715 grams per plant. Conclusively highest weight gains were noticed between 28th July and 12th August. By the end of the harvest, the weight of leaves was decreased to 550 grams per plant as the result of older leaves necrosis. The final leaf weight was in individual variants in range of 373 to 778 grams per plant. The highest weight was found in variant with magnesium application of Magnitra L fertilizer. High dynamics of root growth was recorded from 1st July to 12th August and from 8th September to harvest. The highest final tuber weight (1,274 to 1,601 grams) was observed after Carbonbor K, Carbonbor and Bortrac fertilizer application, i. e. boron application varieties. The highest yield was reached after sodium nitrate application, while the lowest was in control group. Treated groups got in average better outcomes than control group. Alpha amino nitrogen content was low, the lowest values were in average determined after higher boron content fertiliser application. Soluble ash content was in range of 0.33 to 0.42 %. The lowest one was in control group and the groups with boron application fertiliser. MB factor value was positive in all groups and the highest quality sugar beet was harvested in the groups with higher boron application. After yield results evaluation, two relationships were determined; a very strong relationship (with r = 0,834**) between MB factor and water-soluble ash values and a negative relationship (with r = -0,613**) between digestion and MB factor.