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2023, Vol. 34, No. 1

Selle kollektsiooni püsiv URIhttp://hdl.handle.net/10492/8573

Sirvi

Sirvi 2023, Vol. 34, No. 1 Märksõna "crop rotation" järgi

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  • Pisipilt
    Kirje
    Influence of fertilizing and tillage systems on humus content of typical chernozem
    (Estonian Academic Agricultural Society, 2023) Voitovyk, Мykhailo; Butenko, Andrii; Prymak, Іvan; Mishchenko, Yurii; Tkachenko, Mykola; Tsyuk, Оleksii; Panchenko, Оleksandr; Sleptsov, Yurii; Kopylova, Tetiana; Havryliuk, Oleksandr
    The study aimed to measure the effect of tillage and fertilizing systems in short crop rotation on the content, and сomposition of humuse’s substances in soil’s type as typical chernozem of the zone Forest-Steppe of Ukraine. The highest humus content was determined in the variant with the application of 11.5 t ha–1 of organic fertilizers + N27P38K45 kg ha–1. The humus content in the 0–10 cm layer against the background of shallow tillage without a moldboard was 4.25%, with moaldboard-subsurface tillage – 4.23%. These tillage systems have the most favourable effect on the formation and humus matter (t ha–1). The humus storage in the variant of shallow subsurface tillage was 41.4 t ha–1, i.e. 1.3 t less than in differentiated tillage. The use of soil without fertilizing led to significant humus losses and deterioration of the compound of humus substances due to mineralization processes that prevail over immobilization processes. When applying 11.5 t of organic fertilizers and (N27P38K45) mineral fertilizers per hectare of crop rotation area, the number of humic substances increased significantly and the amount of fulvic acids in the top layer decreased. The ratio of HA (Humic acids) to FA (Fulvic acids) is 2.48. The type of humus formation is humus- fulvatic.
  • Pisipilt
    Kirje
    Umbrohtude biomassi, arvukuse ja mitmekesisuse muutused pikaajalise külvikorra katse teises rotatsioonis
    (Estonian Academic Agricultural Society, 2023) Madsen, Helena; Luik, Anne; Eremeev, Viacheslav; Mäeorg, Erkki; Talgre, Liina; Eesti Maaülikool. Põllumajandus- ja keskkonnainstituut
    The effects of long term (established in 2008) five-field crop rotation (barley (Hordeum vulgare L.) with undersown red clover (Trifoium pratense L.), red clover, winter wheat (Triticum aestivum L.), pea (Pisum sativum L.), potato (Solanum tuberosum L.)) on the biomass, abundance and diversity (Shannon-Wiener index) of weeds in three organic (Org) and two conventional (Conv) systems after the second rotation were investigated. The results include data from the second rotation in 2013 – 2017. The control system (Org 0) followed only the crop rotation. In the organic systems Org I and Org II winter cover crops were used. In Org II system composted cattle manure was also applied. The conventional cropping systems were treated with herbicides and fungicides and system Conv 0 acted as control (no fertilizer use). Mineral fertilizer was used in Conv II. In general, the significant differences were evident between conventional and organic cropping systems. There were also some differences depending on the crop. The weed biomass was the lowest in barley and potato plots, with significantly higher values in organic than in conventional systems. In clover plots the highest biomass of weeds occurred in Conv II whilst the lowest in Org I. In winter wheat plots the biomass of weeds was significantly lower in conventional systems than in any of the organic systems. Pea plots had the highest biomass, abundance and diversity of weeds in all systems within all rotational crops. Slight tendencies showed the decrease of weed abundance and diversity at the end of the rotation in systems with cover crops (Org I and Org II). This could be explained by better growing conditions due to higher microbial activity and organic carbon content in the soil of organic systems.