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SAŢETAKOrganska proizvodnja je karakteristiĉna po pozitivnom uticaju na zemljište i ţivotnu sredinu. Sabijenost zemljišta predstavlja jednu od osam glavnih pretnji degradaciji zemljišta. Penetrometrijski otpor konusa i zapreminska masa se koriste kao pokazatelji stepena sabijenosti zemljišta. Cilj ovog rada je bio da se odrede efekti organske i konvencionalne proizvodnje na parametre sabijenosti zemljišta.Istraţivanja su sprovedena na 8 lokaliteta na Poljoprivrednom gazdinstvu porodice Letić u Ĉeneju na karbonatnom ĉernozemu. U sistemu organske proizvodnje su bili blitva, mrkva i rotkvica u zaštićenom prostoru, na otvorenom polju pšenica i jabuka, kupus i tikva. Pšenica gajena konvencionalnom tehnologijom na otvorenom polju nalazila se odmah pored pšenice koja je gajena tehnologijom organske proizvodnje. UtvrĊeno je da su vrednosti zapreminske mase zemljišta u organskoj proizvodnji uglavnom niţe od granice maksimalno dozvoljene sabijenosti od 1.35 g cm -3 , dok je vrednost u konvencionalnoj proizvodnji pšenice bila viša znatno viša od te granice. U organskoj proizvodnji pšenice penetrometrijski otpor je bio znatno niţi u oraniĉnom sloju u odnosu na konvencionalnu proizvodnju pšenice.U organskoj proizvodnji jabuke i kupusa penetrometrijski otpor je viši u površinskom sloju u odnosu na proizvodnju ostalih kultura kod kojih su vrednosti vrlo sliĉne.Kljuĉne reĉi: organska poljoprivreda, sabijenost zemljišta, zapreminska masa UVODPoslednjih godina sve se ĉešće spominje organska poljoprivreda i njen pozitivan uticaj na ţivotnu sredinu. Organska (biološka, ekološka) proizvodnja zasniva se na osnovnim biološkim naĉelima uz ekološko (domaćinsko) korišćenje prirodnih resursa i poštovanje svih elemenata zaštite ţivotne sredine (Lazić i Malešević, 2014). Tehnologija organske proizvodnje podrazumeva veliko angaţovanje ljudske snage u tehnološkim
SAŢETAKOrganska proizvodnja je karakteristiĉna po pozitivnom uticaju na zemljište i ţivotnu sredinu. Sabijenost zemljišta predstavlja jednu od osam glavnih pretnji degradaciji zemljišta. Penetrometrijski otpor konusa i zapreminska masa se koriste kao pokazatelji stepena sabijenosti zemljišta. Cilj ovog rada je bio da se odrede efekti organske i konvencionalne proizvodnje na parametre sabijenosti zemljišta.Istraţivanja su sprovedena na 8 lokaliteta na Poljoprivrednom gazdinstvu porodice Letić u Ĉeneju na karbonatnom ĉernozemu. U sistemu organske proizvodnje su bili blitva, mrkva i rotkvica u zaštićenom prostoru, na otvorenom polju pšenica i jabuka, kupus i tikva. Pšenica gajena konvencionalnom tehnologijom na otvorenom polju nalazila se odmah pored pšenice koja je gajena tehnologijom organske proizvodnje. UtvrĊeno je da su vrednosti zapreminske mase zemljišta u organskoj proizvodnji uglavnom niţe od granice maksimalno dozvoljene sabijenosti od 1.35 g cm -3 , dok je vrednost u konvencionalnoj proizvodnji pšenice bila viša znatno viša od te granice. U organskoj proizvodnji pšenice penetrometrijski otpor je bio znatno niţi u oraniĉnom sloju u odnosu na konvencionalnu proizvodnju pšenice.U organskoj proizvodnji jabuke i kupusa penetrometrijski otpor je viši u površinskom sloju u odnosu na proizvodnju ostalih kultura kod kojih su vrednosti vrlo sliĉne.Kljuĉne reĉi: organska poljoprivreda, sabijenost zemljišta, zapreminska masa UVODPoslednjih godina sve se ĉešće spominje organska poljoprivreda i njen pozitivan uticaj na ţivotnu sredinu. Organska (biološka, ekološka) proizvodnja zasniva se na osnovnim biološkim naĉelima uz ekološko (domaćinsko) korišćenje prirodnih resursa i poštovanje svih elemenata zaštite ţivotne sredine (Lazić i Malešević, 2014). Tehnologija organske proizvodnje podrazumeva veliko angaţovanje ljudske snage u tehnološkim
In the agroecological conditions of Vojvodina, there is not enough research on the influence of plowing cover crops as a green manure on the content of labile organic carbon soluble in hot water (HWOC). The aim of the study was to determine the influence of crop rotation of different species of winter cover crops (CC) and spring crops in the subsequent sowing period (corn, soybeans and Sudan grass) on the content of organic matter (OM) levels as well as the dynamic of labile OM. Research was carried out at the Rimski Šančevi experimental station under Chernozem soil type. The winter CC consisted of the combined intercrops: winter pea (Pisum sativum ssp. Arvense L.) + triticale (×Triticosecale Wittm. ex A. Camus) (PT) and single-species CC winter pea (P) and control (without CC). Plowing of CC and control plots was carried out at a depth of 27 cm in the last decades of May 2018, and the sowing of maize, soybean and Sudan grass in early June with addition of 50 kg N ha-1 . Sampled was done in October at depth of: 0-20 cm, 20-40 cm. The analysis of variance determined a significant effect of cultivated crops (maize, soybeans and Sudan grass) in the subsequent sowing period on the changes of the HWOC content, as well as the interaction of cover crops and fertilization. The highest value of HWOC was measured in maize (658 µg g-1 ) on the variant P N0 (0-20 cm), and the lowest in the Sudan grass P N50 (20-40 cm). The highest share of HWOC in the total OM content was found in maize (2.56%), while the lowest share was measured in Sudan grass (1.87%).
The intensive form of agricultural production often leads to disruption of physical, chemical and biological properties of the soil. Therefore, in recent years there has been an increasing focus on research and finding ways to preserve the soil with management practices that support soil conservation. The research was conducted on the experimental field of the Institute for Field and Vegetable Crops Novi Sad on Rimski Šančevi. The experiment was set up as a randomized block design. The winter cover crops consisted of the combined intercrops: Triticale (×Triticosecale Wittm. ex A. Camus) and winter pea (Pisum sativum ssp. arvense L.) (T+P), solo winter fodder pea crop (Pisum sativum ssp. arvense L.) (P) and a control without winter cover crops (sole or mixtures)(Ø). The experiment with winter cover crops was divided into two blocks. In the first block, the winter cover crops were chopped and plowed, while treatments in the second block were mowed using a rotary mower and the fodder was removed for feeding ruminants. After ploughing and preparing the soil for sowing, sowing of spring crops (soybean, maize and sudan grass) was carried out on all varieties in the subsequent sowing period. This research aims to determine the influence of different types of winter cover crops and spring crops from subsequent sowing period on the physical properties of Chernozem with a special emphasis on soil structure. It was determined that values of MWD on the treatments where the mixture of cover crops (T+P plowed) ranged from 1.11 mm to 1.39 mm, which indicated a better aggregates stability compared to the control treatments where no cover crops were sown. Due to variable root morphology and water requirements, which may alter soil structure, it is required to pay more attention to the adaptation of management strategies through the use of cover crops as well as the selection of their mixes.
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