Abstract
Foliar fertilization provides cultivated plants with the necessary nutrients during the growing season. The conducted field experiment was aimed at comparing the effectiveness of different variants of foliar fertilization applied in the cultivation of winter oilseed rape (Brassica napus L.), cultivar ‘ES Cesario’. The experimental factors were: A (control), B (YaraVita Brassitrel Pro), C (YaraVita Brassitrel Pro and YaraVita Thiotrac), D (YaraVita Brassitrel Pro and YaraVita Bortrac), E (YaraVita Brassitrel Pro and YaraVita Bortrac and YaraVita Thiotrac) and F (YaraVita Thiotrac). Weather conditions were variable over the years of the study and had a modifying effect on most of the tested parameters. Intensive foliar fertilization (variants D and E) resulted in a significant increase in the number of pods per plant, seed and fat yields, and SPAD (soil plant analysis development) and LAI (leaf area index) indices compared to the control. The protein yield was the highest after fertilizer applications in variants C and E. The use of YaraVita Thiotrac alone (variant F) did not provide the expected results. Foliar fertilizers applied in variant D increased Gs (leaf stomatal conductance) measurements and fat content in seeds but decreased TSW and seed protein content. It was shown that intensive foliar fertilization (variants D and E) increased seed boron content compared to YaraVita Thiotrac fertilization and the control. Fat and protein yields were strongly positively correlated with seed yield (r = 0.93 and r = 0.71, respectively). The best economic effect was obtained after applying foliar fertilization in variants D and E; therefore, they can be recommended for agricultural practice.
Highlights
Winter oilseed rape is an important oil plant in Europe, grown mainly for edible oil and biofuel
It was only observed that intensive foliar fertilization increased seed boron content compared to YaraVita Thiotrac fertilization and control
The preparations used in variants D and E resulted in a significant increase in the number of pods per plant, Soil plant analysis development (SPAD) index and Leaf area index (LAI) compared to the control
Summary
Winter oilseed rape is an important oil plant in Europe, grown mainly for edible oil and biofuel. WendaPiesik and Hoppe [3] showed that the use of high-input technology in the cultivation of oilseed rape increased the winter hardiness of plants, number of pods per plant, number of seeds per pod and seed yield The latter authors considered the optimization of mineral fertilization to be important among the elements of agriculture practices. It affected the condition of the plants and hardened them before winter In this aspect, Poisson et al [11] added that modern agriculture should strive to reduce the doses of soil fertilizers while retaining high and good quality yields. Poisson et al [11] added that modern agriculture should strive to reduce the doses of soil fertilizers while retaining high and good quality yields This is dictated by a compromise between environmental and economic goals. Gugała et al [24] indicated that some applied variants of foliar fertilization increased the content of glucosinolates in seeds
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