RESPONSE OF WINTER RAPESEED YIELD TO DIFFERENT DOSES OF FERTILIZER PUBLISHED

A. MOȚ, Roxana Maria MADJAR, Gina VASILE SCĂEȚEANU mot_andrei@yahoo.com
Rapeseed culture is a relatively new type of crop in our country. The rapeseed for oil production was reintroduced in Romania in 1995 and until this period, the areas planted with rape were relatively small. At the moment, between 400000 and 500000 ha per year are grown in our country every year, rarely being altogether harvested. The rapeseed on relatively large areas is compromised due to the winter frost. The growth of rapeseed areas in our country is due to some facts such as: the introduction of varieties and hybrids free of erucic acid and glucosinolates, the cultivation of varieties and hybrids resistant to wintering and falling off, the full mechanization of the crops, the high demand of rapeseed on the external and internal market, especially for fuel production. Rapeseed requires a high fertilization being a great nutrients consumer. Fertilizer doses depend on planned yield and soil agrochemical characterization by nitrogen, phosphorus and potassium available content. The research was carried out in Ialomita County during the agricultural year 2016-2017, on a calcic chernozem using Vesuvio hybrid which present good resistance to frost and have a high capacity to regenerate. The experimental scheme was composed from 4 variants (3 replicates), denoted as it follows: V1 – 18-46 DAP 150 kg + NH4NO3 150 kg; V2 – 18-46 DAP 150 kg + NH4NO3 200 kg; V3 – 18-46 DAP 200 kg + NH4NO3 150 kg; V4 – 18-46 DAP 200 kg + NH4NO3 200 kg. The objectives of the research consisted in evaluation of the influence of mineral fertilization on: rapeseed yield, average height of plant at harvest time, number of lateral branches per plant, number of siliques per plant and on seeds number per silique. The results indicated that application of additional fertilizer doses led to significant yield differences for V3 (110%) and V4 (116%) as against V1 (100%) that was considered as control variant. The other indicators were more or less influenced, depending on the type of fertilization.
fertilization, hybrid, rapeseed, yield
Field crops and pastures
Presentation: poster

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