Ziemas rapša raža atkarībā no slāpekļa mēslojuma normas
2017
Litke, L., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture | Gaile, Z., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture | Ruza, A., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture
Winter oilseed rape (Brassica napus ssp. oleifera L.) is the most widely grown oilseed in Latvia. Fertilization, in particular nitrogen, plays an important role in the production of high yield. However, nitrogen is one of the most dynamic elements of plant nutrition in the soil. Excessive fertilization with nitrogen can contribute to environmental pollution. The objective of this experiment was to clarify the nitrogen fertilization impact on winter oilseed rape yield under two soil tillage systems. Two year field trials were conducted at the Research and Study farm „Peterlauki” of Latvia University of Agriculture (56◦ 30.658′ N and 23◦ 41.580′ E) in the growing seasons of 2014/2015 and 2015/2016. Researched factors were soil tillage (traditional soil tillage with mould-board ploughing at a depth of 22 – 24 cm and reduced soil tillage with disc harrowing at a depth below 10 cm), and nitrogen fertilizer rate (altogether eight rates: N0 or control, N60, N90, N120 (90+30), N150 (100+50), N180 (120+60), N210 (120+60+30), N240 (140+60+40). Results showed that the yield increased with the increase of N fertilizer rate in both soil tillage variants. Seed yield mostly increased visibly until the nitrogen fertilizer rate N180. The research was carried out within the framework of „State and European Union investment for encouragement in agriculture” theme „Determination of maximal fertiliser norms for crops”.
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