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Muutused mulla mikroobide hüdrolüütilises aktiivsuses ja orgaanilise süsiniku sisalduses punase ristiku allakülviga odra kasvatamisel

Kuht, Jaan; Alaru, Maarika; Eremeev, Viacheslav; Talgre, Liina; Loit, Evelin and Luik, Anne (2018) Muutused mulla mikroobide hüdrolüütilises aktiivsuses ja orgaanilise süsiniku sisalduses punase ristiku allakülviga odra kasvatamisel. [Changes in the soil microbial hydrolytic activity (FDA) and the content of organic carbon (Corg) by cultivating barley undersown with red clover.] In: Alaru, Maarika (Ed.) Agronoomia 2018 / Agronomy 2018, March 14, 2018, Tartu, Estonia, Tartu, pp. 8-14.

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Summary

Uurimistulemustest selgus, et punase ristiku allakülviga odra kasvatamine avaldas soodsat mõju mulla mikroorganismidele, suurendades mullaorganismide hüdrolüütilist aktiivsust. Mulla mikroobide hüdrolüütilise aktiivsuse (FDA) määramistulemused olid pärast punase ristiku allakülviga odra kasvatamist tavaviljeluse aladel 18,6% ja mahealadel 37,2% võrra suuremad võrreldes eelvilja (kartuli) alt vabanenud ala mullaga. Katseaastate keskmisena tõusis orgaanilise süsiniku (Corg %) sisaldus maheviljelusviisides 11,6% võrreldes tavaviljelusega. Pärast allakülviga odra kasvatamist võrreldes selle eelsega Corg sisalduses olulisi usaldusväärseid muutusi ei täheldatud. Enne allakülviga odra kasvatamist seos FDA ja Corg vahel sisuliselt puudus. Küll aga esines tugev korrelatiivne seos (r=0,55**) ristiku allakülviga odra järgse mulla orgaanilise süsiniku sisalduse ja mikroobse aktiivsuse vahel. Mulla huumusvaru muutused allakülviga odra kasvatamisel näitasid tavaviljelussüsteemides võrreldes kartulijärgse alaga enamasti kasvutendentsi, samas kui maheviljelusega aladel võis täheldada huumusvaru mõningast vähenemist.

Summary translation

The experiments were carried out in the Eerika test site of Rõhu experimental station of Institute of agricultural and environmental sciences, Estonian University of Life Sciences during 2012–2016. There were 5 crops in rotation: red clover, winter wheat, pea, potato and barley undrsown with red clover. There were 7 cultivation systems in the experimental setup (4 conventional systems with chemical plant protection and mineral fertilizers, 3 organic systems which included winter cover crops and farm manure). The aim of the present research was to study the effect of cultivating the barley undersown with red clover on the soil hydrolytic activity (FDA), the change in the content of organic carbon (Corg) and humus (t ha-1 ) compared to the same parameters from the field previously under potato (precrop of barley in the rotation). Our results indicated that the cultivation of barley undersown with red clover had a positive impact on the content of soil microorganisms, by increasing their hydrolytic activity. The values for soil microbial hydrolytic activity (FDA) after the cultivation of barley undersown with red clover were by 18.6% in conventional systems and 37.2% in organic systems, compared to the soil after the harvest of potato (precrop). As an average of the experimental years the content of organic carbon (Corg, %) increased by 11.6% in organic systems compared to the conventional. After the cultivation of barley undersown with red clover there were no significant changes in the content of organic carbon (Corg). Strong correlation (r=0.55) was found between the Corg content in the soil after barley and the soil hydrolytic activity. The changes in the humus content after the cultivation of barley undersown with red clover showed an increasing trend in conventional systems, while in organic systems slight decrease was measured.

EPrint Type:Conference paper, poster, etc.
Type of presentation:Paper
Keywords:cropping systems, organic farming, barley, FDA, Corg
Subjects: Farming Systems
Soil > Soil quality > Soil biology
Soil > Nutrient turnover
Crop husbandry
Research affiliation: Estonia > Estonian University of Life Sciences
European Union > CORE Organic Plus > FertilCrop
ISSN:1736-6275
Deposited By: Peetsmann, Ms Elen
ID Code:32794
Deposited On:15 Mar 2018 14:43
Last Modified:02 Apr 2019 15:09
Document Language:Estonian/Eesti
Status:Published
Refereed:Peer-reviewed and accepted

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