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- Title
TEHNOLOGIJA GAJENJA U FUNKCIJI OPTIMALNOG PRINOSA, PRILAGOĐENA GODINI, NJIVI I HIBRIDU/SORTI.
- Authors
Marinković, Branko; Crnobarac, Jovan; Jaćimović, Goran; Marinković, Duško
- Abstract
After analyzing weather conditions (precipitation, temperatures, potential ETP, actual ETP, precipitation deficits), significant changes were observed. The present paper discusses the 1963-2007 and 1988-2007 periods. Precipitation was divided into three categories: low (the 25% of the years with the lowest precipitation), high (the 25% of the years with the highest precipitation) and average precipitation (the 50% in the middle). In the last 25 years, the results showed, dry years had 10.4% less growing sea son precipitation than the 45-year average, while wet ones had 8.9% more. A similar situation was observed for total precipitation too. An analysis of the aforementioned water balance components in several crop species (sugar beet, maize, sunflower, and soybean) showed that dry years had more pronounced water deficits in recent years. Nitrogen fertilizer application and seeding rate should be adjusted to the amount of winter precipitation, nitrogen distribution down the soil profile, and each individual field and hybrid/cultivar. When winter precipitation is low, the maize seeding rate should be reduced by 10-20% depending on the distribution of mineral nitrogen down the soil profile. A similar seeding rate adjustment should be made with sugar beet too (60-80.000 plants/ha). With optimal and high winter precipitation, stand density should be maintained at the recommended level. In the case of high winter precipitation, and depending on nitrogen distribution in the soil, nitrogen fertilization should in creased so as to produce an optimal, realistic yield. Nitrogen fertilization in the spring should be carried out according to the balance method using the following formula: y = a x b - [(c + d) - e]. Good results in agricultural production can be achieved only through a balance between all cultural practices and weather conditions on the one hand and the potential of the growing field and the cultivar/hybrid on the other.
- Subjects
NITROGEN fertilizers; CROP yields; AGRICULTURAL climatology; TILLAGE; NITROGEN in agriculture
- Publication
Zbornik Radova - A Periodical of Scientific Research on Field & Vegetable Crops, 2008, Vol 45, Issue 1, p159
- ISSN
0354-7698
- Publication type
Article