The effects of three tillage systems: no-tillage (NT), reduced tillage (RT) and conventional tillage (CT), and three levels of fertilization (0, 258 and 516 kg/ha NPK (58:18:24)), on the maize yield during ten years (1999)(2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008) were analyzed on the chernozem soil type in Zemun Polje, Serbia. Statistical analyses showed significant effects of all three factors i.e., year, soil tillage and amount of fertilizers, and their interactions on the maize yield. The ten-year averages showed that the highest yields were observed with CT (10.61 t/ha), while the averages with RT and NT were lower (8.99 t/ha and 6.85 t/ha, respectively). The results of the influence of the amount of the applied fertilizers on maize yield showed that the lowest yield was in the zero level of fertilization 7.71 t/ha, while the yield was raised when the 258 kg/ha and 516 kg/ha NPK were applied (9.18 t/ha and 9.56 t/ha, respectively). Analyzing the influence of the soil tillage systems on maize production with respect to the amounts of applied fertilizers, this research revealed the benefits of CT under the presented agroecological conditions, irrespective of the level of applied fertilizer.
Genetic potential of maize hybrids grown in Serbia is 10-15 t ha-1 , while the average yields are considerably lower. There are many reasons for this. At first, it is well known that drought is present often in some parts of country. Some soils are not suitable in the same degree for intensive maize production, application of mineral fertilizers is insufficient, mechanization is outdated and arable farms are small and fragmented. During the period 19652012 high variations in precipitation were present during the maize vegetation. The yearly average precipitation sum was 688.9 mm, with 397.5 mm during vegetation. According to precipitation amount, years were divided into groups: I 200-300 mm 7, (15%); II 301-400 mm 21, (44%) and III 401-500 mm 14, (30%), and IV in 5 years (11%) more than 500 mm of precipitation was present. The highest average yield in Serbia was achieved in 1991 (5.95 t ha-1) and the lowest in 2000 (2.44 t ha-1). The average yield increase was 114 kg ha-1 per year from 1965 to 1985, and it was 22 kg ha-1 per year from 1986 to 2012. In experiments during the period 1998-2012, when the standard cropping technology (MSY) was applied, the average grain yield was10.46 t ha-1 for hybrids of FAO 300-400, 10.39 t ha-1 for hybrids from FAO 500 and 11.38 for FAO 600-700. There were no significant differences in yield between hybrids from examined FAO groups. According to this, average maize yield includes only 44.2% for FAO 300-400, 44.5% for FAO 500 and 40.6% for FAO 600700 utilized maize genetic potential. The significant improvement of maize production demand the strategic long-term program, where it will be elaborated: merging of land properties, increasing of the areas with irrigation and increasing of the technology level in maize cropping. [Projekat Ministarstva nauke Republike Srbije, br. TR-31037]
This paper discusses the application of the infrared (IR) spectroscopy method for determination of structural properties of maize hybrid grains. The IR spectrum of maize grain has been registered in the following hybrids: ZP 341, ZP 434 and ZP 505. The existence of spectral bands varying in both number and intensity, as well as their shape, frequency and kinetics have been determined. They have been determined by valence oscillations and deformation oscillations of the following organic compounds: alkanes, alkenes, alkynes, amides, alcohols, ethers, carboxylic acids, esters and aldehydes and ketones, characteristic for biogenic compounds such as carbohydrates, proteins and lipids. In this way, possible changes in the grain structure of observed maize hybrids could be detected.
SUMMARYMaize is one of the most important crops in the world. Its successful production depends mainly on meteorological factors. The aim of study was to define the most efficient tillage system (no-till, reduced or conventional tillage) and fertilizer amount (Ø, 330 or 660 kg ha -1 of N:P:K) for high maize yields (ZP 704) under rain-fed and irrigation conditions, according to the results of a longterm maize cropping experiment (1991)(1992)(1993)(1994)(1995)(1996)(1997)(1998)(1999)(2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010). The observed 20 year period was characterized by increasing trends of the average temperatures and sum of precipitation. A positive dependence between grain yield and precipitation was noticed only under rain-fed cropping. Weibull analysis emphasised that the highest yields were achieved with 330 kg ha -1 of N:P:K fertilizer and conventional tillage under unfavourable conditions. Negative meteorological factors were diminished under irrigation, where high inputs resulted in increased yields. However, rain-fed cropping is still the most abundant cropping practice in the world, and moderate inputs (330 kg ha -1 N:P:K) resulted in stability of the maize yield, regardless of the lower yields achieved. On the other hand, the high yields attained with high fertilizer and tillage inputs under irrigation could be reasonable only in seasons with low precipitation (drought).
SUMMARYStudies on maize growing practices have been performed in the Maize Research Institute, Zemun Polje since its establishment. Numerous studies realised in accordance with contemporary global trends indicated the direction of development of maize growing practices with the aim to use the genetic potential of newly derived hybrids. Although, the genetic potential of the yield of maize hybrids grown in Serbia is 10 to 15 t/hа, the recorded average yields are significantly lower. The experimental trials with the application of standard growing practices conducted during the fifteen growing seasons showed that the maize yield varied from 10.46 to 11.38 t/hа. The obtained results indicated that, for the region of central Serbia, contemporary maize growing systems should include a correctly applied crop rotation with legumes (soybean), conventional tillage with deep autumn ploughing, precisely determined plant density and the time of sowing. Another important factor is the application of fertilisers the content and formulation of which are adjusted to the requirements of the cultivated plant and irrigation tuned to the requirements of crops and climate in terms of norms and frequency of the application.
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