Effects of nitrogen fertilizer and soil tillage on winter oilseed rape yield and quality | Slāpekļa mēslojuma un augsnes apstrādes ietekme uz ziemas rapša ražu un kvalitāti
2019
Litke, L., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia) | Gaile, Z., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia) | Ruza, A., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia)
Winter oilseed rape is the most widely grown oil plant in Latvia. One of the most important agrotechnical measures for oilseed rape growing is the supply of nutrients, especially nitrogen. Nitrogen is the most dynamic plant nutrient, therefore growers should pay an attention to careful use of it in order to prevent N-leaching from the soil. The objective of this research was to analyse nitrogen fertilizer impact on winter oilseed rape yield and quality under two soil tillage systems. Four-year (2014/2015, 2015/2016, 2016/2017 and 2017/2018) experiment was conducted at the research and study farm “Pēterlauki” of Latvia University of Life Sciences and Technologies. The researched factors were eight nitrogen fertilizer rates (N0, N60, N90, N120(80+40); N150(100+50), N180(120+60), N210(120+60+30); N240(140+60+40)) and two types of soil tillage treatments – traditional soil tillage with mould-board ploughing at the depth until 22 cm and reduced soil tillage with disc harrowing at the depth until 10 cm. The results showed that the nitrogen fertilizer rate (p is less than 0.001) and soil tillage (p is less than 0.05) had a significant impact on winter oilseed rape yield. The average seed yield importantly increased until nitrogen fertilizer rate N150 – N180, but this aspect still needs further research. Significantly higher seed yield was observed under traditional soil tillage. Nitrogen fertilizer rate significantly (p is less than 0.001) affected oil content and volume weight. If nitrogen rate was increased, also volume weight increased, but oil content in seed decreased.
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